Palladon Retard

PALLADONE is indicated for the management of pain in opioid-tolerant patients severe enough to require daily, around-the-clock, long-term opioid treatment and for which alternative treatment options are inadequate.

Patients considered opioid tolerant are those who are receiving, for one week or longer, at least 60 mg oral morphine per day, 25 mcg transdermal fentanyl/hour, 30 mg oral oxycodone/day, 8 mg oral hydromorphone/day, 25 mg oral oxymorphone/day or an equianalgesic dose of another opioid.

Limitations of Use

• Because of the risks of addiction, abuse, and misuse with opioids, even at recommended doses, and because of the greater risks of overdose and death with extended-release opioid formulations, reserve PALLADONE for use in patients for whom alternative treatment options (e.g., non-opioid analgesics or immediate-release opioids) are ineffective, not tolerated, or would be otherwise inadequate to provide sufficient management of pain.
• PALLADONE is not indicated as an as-needed (prn) analgesic.

Initial Dosing

PALLADONE should be prescribed only by healthcare professionals who are knowledgeable in the use of potent opioids for the management of chronic pain.

Due to the risk of respiratory depression, PALLADONE is only indicated for use in patients who are already opioid-tolerant. Discontinue or taper all other extended-release opioids when beginning PALLADONE therapy. As PALLADONE is only for use in opioid-tolerant patients, do not begin any patient on PALLADONE as the first opioid.

Patients considered opioid-tolerant are those who are taking at least 60 mg of morphine daily, or at least 30 mg of oral oxycodone daily, or at least 8 mg of oral hydromorphone daily or an equianalgesic dose of another opioid for a week or longer.

Initiate the dosing regimen for each patient individually; taking into account the patient's prior analgesic treatment experience and risk factors for addiction, abuse, and misuse. Monitor patients closely for respiratory depression, especially within the first 24 to 72 hours of initiating therapy with PALLADONE.

PALLADONE extended-release capsules must be taken whole. Crushing, chewing, or dissolving PALLADONE capsules will result in uncontrolled delivery of hydromorphone and can lead to overdose or death.

Conversion from Other Oral Opioids to PALLADONE

Discontinue all other around-the-clock opioid drugs when PALLADONE therapy is initiated.

While useful tables of opioid equivalents are readily available, there is substantial inter-patient variability in the relative potency of different opioid drugs and products. As such, it is preferable to underestimate a patient's 24-hour oral hydromorphone requirements and provide rescue medication (e.g., immediate-release opioid) than to overestimate the 24-hour oral hydromorphone requirements which could result in adverse reaction.

In a PALLADONE clinical trial with an open-label titration period, patients were converted from their prior opioid to PALLADONE using the Table 1 as a guide for the initial PALLADONE dose. The recommended starting dose of PALLADONE is 50% of the calculated estimate of daily hydromorphone requirement. Calculate the estimated daily hydromorphone requirement using Table 1.

Consider the following when using the information in Table 1:

• This is not a table of equianalgesic doses.
• The conversion factors in this table are only for the conversion from one of the listed oral opioid analgesics to PALLADONE.
• The table cannot be used to convert from PALLADONE to another opioid. Doing so will result in an overestimation of the dose of the new opioid and may result in fatal overdose.

Table 1: Conversion Factors to PALLADONE*

To calculate the estimated PALLADONE dose using Table 1:

• For patients on a single opioid, sum the current total daily dose of the opioid and then multiply the total daily dose by the conversion factor to calculate the approximate oral hydromorphone daily dose.
• For patients on a regimen of more than one opioid, calculate the approximate oral hydromorphone dose for each opioid and sum the totals to obtain the approximate total hydromorphone daily dose.
• For patients on a regimen of fixed-ratio opioid/non-opioid analgesic products, use only the opioid component of these products in the conversion.

Always round the dose down, if necessary, to the appropriate PALLADONE strength(s) available.

Example conversion from a single opioid to PALLADONE:

Step 1: Sum the total daily dose of the opioid

• 30 mg of oxycodone 2 times = 60 mg total daily dose of oxycodone

Step 2: Calculate the approximate equivalent dose of oral hydromorphone based on the total daily dose of the current opioid using Table 1

• 60 mg total daily dose of oxycodone x Conversion Factor of 0.25 =15 mg of oral hydromorphone daily

Step 3: Calculate the approximate starting dose of PALLADONE to be given every 24 hours, which is 50% of the calculated oral hydromorphone dose. Round down, if necessary, to the appropriate PALLADONE capsule strengths available.

• 50 % of 15 mg is an initial dose of 6 mg of PALLADONE once daily
• Adjust individually for each patient

Close observation and frequent titration are warranted until pain management is stable on the new opioid. Monitor patients for signs and symptoms of opioid withdrawal or for signs of over-sedation/toxicity after converting patients to PALLADONE.

Conversion from Transdermal Fentanyl to PALLADONE

Eighteen hours following the removal of the transdermal fentanyl patch, PALLADONE treatment can be initiated. To calculate the 24-hour PALLADONE dose, use a conversion factor of 25 mcg/hr fentanyl transdermal patch to 12 mg of PALLADONE. Then reduce the PALLADONE dose by 50%.

For example:

Step 1: Identify the dose of transdermal fentanyl.

• 75 mg of transdermal fentanyl

Step 2: Use the conversion factor of 25 mcg/hr fentanyl transdermal patch to 12 mg of PALLADONE.

• 75 mg of transdermal fentanyl : 36 mg total daily dose of PALLADONE

Step 3: Calculate the approximate starting dose of PALLADONE to be given every 24 hours, which is 50% of the converted dose. Round down, if necessary, to the appropriate PALLADONE tablet strengths available.

• 50% of 36 mg results in an initial dose of 18 mg, which would be rounded down to 16 mg of PALLADONE once daily
• Adjust individually for each patient

Conversion from Methadone to PALLADONE

Close monitoring is of particular importance when converting from methadone to other opioid agonists. The ratio between methadone and other opioid agonists may vary widely as a function of previous dose exposure. Methadone has a long half-life and can accumulate in the plasma.

Titration And Maintenance Of Therapy

Individually titrate PALLADONE to a dose that provides adequate analgesia and minimizes adverse reactions. Continually reevaluate patients receiving PALLADONE to assess the maintenance of pain control and the relative incidence of adverse reactions, as well as monitoring for the development of addiction, abuse, or misuse. Frequent communication is important among the prescriber, other members of the healthcare team, the patient, and the caregiver/family during periods of changing analgesic requirements, including initial titration. During chronic therapy, periodically reassess the continued need for opioid analgesics.

Plasma levels of PALLADONE are sustained for 18 to 24 hours. Dosage adjustments of PALLADONE may be made in increments of 4 to 8 mg every 3 to 4 days as needed to achieve adequate analgesia.

Patients who experience breakthrough pain may require a dose increase of PALLADONE, or may need rescue medication with an appropriate dose of an immediate-release analgesic. If the level of pain increases after dose stabilization, attempt to identify the source of increased pain before increasing the PALLADONE dose.

If unacceptable opioid-related adverse reactions are observed, the subsequent doses may be reduced. Adjust the dose to obtain an appropriate balance between management of pain and opioid-related adverse reactions.

Discontinuation Of PALLADONE

When a patient no longer requires therapy with PALLADONE, taper doses gradually, by 25% to 50% every 2 or 3 days down to a dose of 12 mg before discontinuation of therapy, to prevent signs and symptoms of withdrawal in the opioid-tolerant patient.

To dispose of unused PALLADONE flush all remaining capsules down the toilet or remit to authorities at a certified drug take-back program.

Hepatic Impairment

Start patients with moderate hepatic impairment on 25% of the PALLADONE dose that would be prescribed for patients with normal hepatic function. Closely monitor patients with moderate hepatic impairment for respiratory and central nervous system depression during initiation of therapy with PALLADONE and during dose titration. Use of alternate analgesics is recommended for patients with severe hepatic impairment.

Renal Impairment

Start patients with moderate renal impairment on 50% and patients with severe renal impairment on 25% of the PALLADONE dose that would be prescribed for patients with normal renal function. Closely monitor patients with renal impairment for respiratory and central nervous system depression during initiation of therapy with PALLADONE and during dose titration. As PALLADONE is only intended for once daily administration, consider use of an alternate analgesic that may permit more flexibility with the dosing interval in patients with severe renal impairment.

Administration Of PALLADONE

Instruct patients to swallow PALLADONE capsules intact. The capsules are not to be crushed, dissolved, or chewed due to the risk of rapid release and absorption of a potentially fatal dose of hydromorphone.

PALLADONE is contraindicated in:

• Opioid non-tolerant patients. Fatal respiratory depression could occur in patients who are not opioid tolerant.
• Patients with significant respiratory depression
• Patients with acute or severe bronchial asthma in an unmonitored setting or in the absence of resuscitative equipment
• Patients with known or suspected paralytic ileus
• Patients who have had surgical procedures and/or underlying disease resulting in narrowing of the gastrointestinal tract, or have “blind loops” of the gastrointestinal tract or gastrointestinal obstruction.
• Patients with hypersensitivity (e.g., anaphylaxis) to hydromorphone or sulfite-containing medications.

WARNINGS

Included as part of the PRECAUTIONS section.

PRECAUTIONS

Addiction, Abuse, And Misuse

PALLADONE contains hydromorphone, a Schedule II controlled substance. As an opioid, PALLADONE exposes users to the risks of addiction, abuse, and misuse. As modified-release products such as PALLADONE deliver the opioid over an extended period of time, there is a greater risk for overdose and death due to the larger amount of hydromorphone present.

Although the risk of addiction in any individual is unknown, it can occur in patients appropriately prescribed PALLADONE and in those who obtain the drug illicitly. Addiction can occur at recommended doses and if the drug is misused or abused.

Assess each patient's risk for opioid addiction, abuse, or misuse prior to prescribing PALLADONE, and monitor all patients receiving PALLADONE for the development of these behaviors or conditions. Risks are increased in patients with a personal or family history of substance abuse (including drug or alcohol addiction or abuse) or mental illness (e.g., major depression). The potential for these risks should not, however, prevent the prescribing of PALLADONE for the proper management of pain in any given patient. Patients at increased risk may be prescribed modified-release opioid formulations such as PALLADONE, but use in such patients necessitates intensive counseling about the risks and proper use of PALLADONE along with intensive monitoring for signs of addiction, abuse, and misuse.

Abuse or misuse of PALLADONE by crushing, chewing, snorting, or injecting the dissolved product will result in the uncontrolled delivery of hydromorphone and can result in overdose and death.

Opioid agonists such as PALLADONE are sought by drug abusers and people with addiction disorders and are subject to criminal diversion. Consider these risks when prescribing or dispensing PALLADONE. Strategies to reduce these risks include prescribing the drug in the smallest appropriate quantity and advising the patient on the proper disposal of unused drug. Contact local state professional licensing board or state controlled substances authority for information on how to prevent and detect abuse or diversion of this product.

Life-threatening Respiratory Depression

Serious, life-threatening, or fatal respiratory depression has been reported with the use of modified-release opioids, even when used as recommended. Respiratory depression from opioid use, if not immediately recognized and treated, may lead to respiratory arrest and death. Management of respiratory depression may include close observation, supportive measures, and use of opioid antagonists, depending on the patient's clinical status. Carbon dioxide (CO2) retention from opioid-induced respiratory depression can exacerbate the sedating effects of opioids.

While serious, life-threatening, or fatal respiratory depression can occur at any time during the use of PALLADONE, the risk is greatest during the initiation of therapy or following a dose increase. Closely monitor patients for respiratory depression when initiating therapy with PALLADONE and following dose increases.

To reduce the risk of respiratory depression, proper dosing and titration of PALLADONE are essential. Overestimating the PALLADONE dose when converting patients from another opioid product can result in fatal overdose with the first dose.

Accidental ingestion of even one dose of PALLADONE, especially by children, can result in respiratory depression and death due to an overdose of hydromorphone.

Neonatal Opioid Withdrawal Syndrome

Prolonged use of PALLADONE during pregnancy can result in withdrawal signs in the neonate. Neonatal opioid withdrawal syndrome, unlike opioid withdrawal syndrome in adults, may be life-threatening if not recognized and treated, and requires management according to protocols developed by neonatology experts. If opioid use is required for a prolonged period in a pregnant woman, advise the patient of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available.

Neonatal opioid withdrawal syndrome presents as irritability, hyperactivity and abnormal sleep pattern, high pitched cry, tremor, vomiting, diarrhea and failure to gain weight. The onset, duration, and severity of neonatal opioid withdrawal syndrome vary based on the specific opioid used, duration of use, timing and amount of last maternal use, and rate of elimination of the drug by the newborn.

Interactions With Central Nervous System Depressants

Hypotension, profound sedation, coma, respiratory depression, and death may result if PALLADONE is used concomitantly with alcohol or other central nervous system (CNS) depressants (e.g., sedatives, anxiolytics, hypnotics, neuroleptics, other opioids).

When considering the use of PALLADONE in a patient taking a CNS depressant, assess the duration of use of the CNS depressant and the patient's response, including the degree of tolerance that has developed to CNS depression. Additionally, evaluate the patient's use of alcohol or illicit drugs that cause CNS depression. If the decision to begin PALLADONE is made, start with 1/3 to ½ the calculated starting dose of PALLADONE, monitor patients for signs of sedation and respiratory depression, and consider using a lower dose of the concomitant CNS depressant.

Use In Ederly, Cachectic, and Debilitated Patients

Life-threatening respiratory depression is more likely to occur in elderly, cachectic, or debilitated patients as they may have altered pharmacokinetics or altered clearance compared to younger, healthier patients. Monitor such patients closely, particularly when initiating and titrating PALLADONE and when PALLADONE is given concomitantly with other drugs that depress respiration.

Use In Patients With Chronic Pulmonary Disease

Monitor patients with significant chronic obstructive pulmonary disease or cor pulmonale, and patients having a substantially decreased respiratory reserve, hypoxia, hypercapnia, or pre-existing respiratory depression for respiratory depression, particularly when initiating therapy and titrating with PALLADONE, as in these patients, even usual therapeutic doses of PALLADONE may decrease respiratory drive to the point of apnea. Consider the use of alternative non-opioid analgesics in these patients if possible.

Hypotensive Effect

PALLADONE may cause severe hypotension including orthostatic hypotension and syncope in ambulatory patients. There is an increased risk in patients whose ability to maintain blood pressure has already been compromised by a reduced blood volume or concurrent administration of certain CNS depressant drugs (e.g. phenothiazines or general anesthetics). Monitor these patients for signs of hypotension after initiating or titrating the dose of PALLADONE.

Use In Patients With Head Injury Or Increased Intracranial Pressure

Monitor patients taking PALLADONE who may be susceptible to the intracranial effects of CO2 retention (e.g., those with evidence of increased intracranial pressure or brain tumors) for signs of sedation and respiratory depression, particularly when initiating therapy with PALLADONE. PALLADONE may reduce respiratory drive, and the resultant CO2 retention can further increase intracranial pressure. Opioids may also obscure the clinical course in a patient with a head injury. Avoid the use of PALLADONE in patients with impaired consciousness or coma.

Use In Patients with Gastrointestinal Conditions

PALLADONE is contraindicated in patients with paralytic ileus. Avoid the use of PALLADONE in patients with other GI obstruction.

Because the PALLADONE capsule is nondeformable and does not appreciably change in shape in the GI tract, PALLADONE is contraindicated in patients with preexisting severe gastrointestinal narrowing (pathologic or iatrogenic, for example: esophageal motility disorders, small bowel inflammatory disease, “short gut” syndrome due to adhesions or decreased transit time, past history of peritonitis, cystic fibrosis, chronic intestinal pseudoobstruction, or Meckel's diverticulum). There have been reports of obstructive symptoms in patients with known strictures or risk of strictures, such as previous GI surgery, in association with the ingestion of drugs in nondeformable extended-release formulations.

It is possible that PALLADONE capsules may be visible on abdominal x-rays under certain circumstances, especially when digital enhancing techniques are utilized.

The hydromorphone in PALLADONE may cause spasm of the sphincter of Oddi. Monitor patients with biliary tract disease, including acute pancreatitis, for worsening symptoms.

Sulfites

PALLADONE contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. The overall prevalence of sulfite sensitivity in the general population is unknown and probably low. Sulfite sensitivity is seen more frequently in asthmatic than in nonasthmatic people.

Use In Patients With Convulsive Or Seizure Disorders

The hydromorphone in PALLADONE may aggravate convulsions in patients with convulsive disorders, and may induce or aggravate seizures in some clinical settings. Monitor patients with a history of seizure disorders for worsened seizure control during PALLADONE therapy.

Avoidance Of Withdrawal

Avoid the use of mixed agonist/antagonist (i.e., pentazocine, nalbuphine, and butorphanol) or partial agonists (buprenorphine) analgesics in patients who have received or are receiving a course of therapy with a full opioid agonist analgesic, including PALLADONE. In these patients, mixed agonists/antagonist and partial agonist analgesics may reduce the analgesic effect and/or may precipitate withdrawal symptoms.

When discontinuing PALLADONE, gradually taper the dose. Do not abruptly discontinue PALLADONE.

Driving And Operating Machinery

PALLADONE may impair the mental and/or physical abilities needed to perform potentially hazardous activities such as driving a car or operating machinery. Warn patients not to drive or operate dangerous machinery unless they are tolerant to the effects of PALLADONE and know how they will react to the medication.

Patient Counseling Information

Advise the patient to read the FDA-approved patient labeling (Medication Guide).

Addiction, Abuse, and Misuse

Inform patients that the use of PALLADONE, even when taken as recommended, can result in addiction, abuse, and misuse, which can lead to overdose or death. Instruct patients not to share PALLADONE with others and to take steps to protect PALLADONE from theft or misuse.

Life-threatening Respiratory Depression

Inform patients of the risk of life-threatening of respiratory depression, including information that the risk is greatest when starting PALLADONE or when the dose is increased, and that it can occur even at recommended doses. Advise patients how to recognize respiratory depression and to seek medical attention if breathing difficulties develop.

Accidental Ingestion

Inform patients that accidental ingestion, especially in children, may result in respiratory depression or death. Instruct patients to take steps to store PALLADONE securely and to dispose of unused PALLADONE by flushing the capsules down the toilet.

Neonatal Opioid Withdrawal Syndrome

Inform female patients of reproductive potential that prolonged use of PALLADONE during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated.

Interactions with Alcohol and other CNS Depressants

Inform patients that potentially serious additive effects may occur if PALLADONE is used with alcohol or other CNS depressants, and not to use such drugs unless supervised by a health care provider.

Important Administration Instructions

Instruct patients how to properly take PALLADONE, including the following:

• Swallowing PALLADONE whole
• Not crushing, chewing, splitting or dissolving the capsule
• Using PALLADONE exactly as prescribed to reduce the risk of life-threatening adverse reactions (e.g., respiratory depression)
• Not discontinuing PALLADONE without first discussing the need for a tapering regimen with the prescriber

Gastrointestinal Blockage

Advise patients that people with certain stomach or intestinal problems such as narrowing of the intestines or previous surgery may be at higher risk of developing a blockage. Symptoms include abdominal distension, abdominal pain, severe constipation, or vomiting. Instruct patients to contact their healthcare provider immediately if they develop these symptoms.

Hypotension

Inform patients that PALLADONE may cause orthostatic hypotension and syncope. Instruct patients how to recognize symptoms of low blood pressure and how to reduce the risk of serious consequences should hypotension occur (e.g., sit or lie down, carefully rise from a sitting or lying position).

Driving or Operating Heavy Machinery

Inform patients that PALLADONE may impair the ability to perform potentially hazardous activities such as driving a car or operating heavy machinery. Advise patients not to perform such tasks until they know how they will react to the medication.

Constipation

Advise patients of the potential for severe constipation, including management instructions and when to seek medical attention.

Anaphylaxis

Inform patients that anaphylaxis has been reported with ingredients contained in PALLADONE. Advise patients how to recognize such a reaction and when to seek medical attention.

Pregnancy

Advise female patients that PALLADONE can cause fetal harm and to inform the prescriber if they are pregnant or plan to become pregnant.

Disposal

Advise patients to flush the unused capsules down the toilet when PALLADONE is no longer needed.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Carcinogenesis

No carcinogenicity studies have been conducted in animals.

Hydromorphone was negative in the in vitro bacterial reverse mutation assay and in the in vivo mouse micronucleus assay. Hydromorphone was negative in the mouse lymphoma assay in the absence of metabolic activation, but was positive in the mouse lymphoma assay in the presence of metabolic activation. Morphinone, an impurity, tested as a besylate salt was negative in the in vitro bacterial reverse mutation assay and negative in the in vivo mouse micronucleus assay. Morphinone was positive in the Chinese Hamster Ovary Cell Chromosomal Aberration test in the absence and presence of metabolic activation.

Hydromorphone did not affect fertility in rats at oral doses up to 5 mg/kg which is equivalent to a 32 mg human daily oral dose on a body surface area basis.

Mutagenesis

Hydromorphone was not mutagenic in the in vitro bacterial reverse mutation assay (Ames assay). Hydromorphone was not clastogenic in either the in vitro human lymphocyte chromosome aberration assay or the in vivo mouse micronucleus assay.

Impairment of Fertility

Hydromorphone given orally to rats during the mating period caused a slight but statistically significant reduction in implantations at 6.25 mg/kg/day (~1.2 times the human exposure following to 32 mg/day).

Use In Specific Populations

Pregnancy

Clinical Considerations

Fetal/neonatal adverse reactions

Prolonged use of opioid analgesics during pregnancy for medical or nonmedical purposes can result in physical dependence in the neonate and neonatal opioid withdrawal syndrome shortly after birth. Observe newborns for symptoms of neonatal opioid withdrawal syndrome, such as poor feeding, diarrhea, irritability, tremor, rigidity, and seizures, and manage accordingly.

Teratogenic Effects -Pregnancy Category C

There are no adequate and well-controlled studies in pregnant women. PALLADONE should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Hydromorphone was not teratogenic in female rats given oral doses up to 10 mg/kg or female rabbits given oral doses up to 50 mg/kg during the major period of organ development. Estimated exposures in the female rat and rabbit were approximately 3-fold and 6-fold higher than a 32 mg human daily oral dose based on exposure (AUC0-24h).

Hydromorphone administration to pregnant Syrian hamsters and CF-1 mice during major organ development revealed teratogenicity likely the result of maternal toxicity associated with sedation and hypoxia. In Syrian hamsters given single subcutaneous doses from 14 to 278 mg/kg during organogenesis (gestation days 8 to10), doses ≥ 19 mg/kg hydromorphone produced skull malformations (exencephaly and cranioschisis). Continuous infusion of hydromorphone (5 mg/kg, s.c.) via implanted osmotic mini pumps during organogenesis (gestation days 7 to10) produced soft tissue malformations (cryptorchidism, cleft palate, malformed ventricals and retina), and skeletal variations (supraoccipital, checkerboard and split sternebrae, delayed ossification of the paws and ectopic ossification sites). The malformations and variations observed in the hamsters and mice were at doses approximately 3-fold higher and < 1-fold lower, respectively, than a 32 mg human daily oral dose on a body surface area basis.

Nonteratogenic Effect

In a rat pre-and post-natal study, an increase in pup mortality and a decrease in pup body weight which was associated with maternal toxicity was observed at doses of 2 and 5 mg/kg/day. The maternal no effect level for hydromorphone was 0.5 mg/kg/day which is < 1-fold lower than a 32 mg human daily oral dose on a body surface area. Hydromorphone had no effect on pup development or reproduction when given to female rats during the pre-natal and postnatal periods up to a dose of 5 mg/kg which is equivalent to a 32 mg human daily oral dose on a body surface area basis.

Neonates born to mothers who have been taking opioids regularly prior to delivery will be physically dependent. The withdrawal signs include irritability and excessive crying, tremors, hyperactive reflexes, increased respiratory rate, increased stools, sneezing, yawning, vomiting, and fever. The intensity of the syndrome does not always correlate with the duration of maternal opioid use or dose. There is no consensus on the best method of managing withdrawal. Approaches to the treatment of the syndrome have included supportive care and, if indicated, drugs such as paregoric or phenobarbital.

Labor And Delivery

PALLADONE is not for use in women during and immediately prior to labor, where shorter acting analgesics or other analgesic techniques are more appropriate. Occasionally, opioid analgesics may prolong labor by temporarily reducing the strength, duration, and frequency of uterine contractions. However, these effects are not consistent and may be offset by an increased rate of cervical dilatation which tends to shorten labor.

Opioids cross the placenta and may produce respiratory depression and psychophysiologic effects in neonates. Closely observe neonates whose mothers received opioid analgesics during labor for signs of respiratory depression. An opioid antagonist, such as naloxone, should be available for reversal of opioid-induced respiratory depression in the neonate in such situations.

Nursing Mothers

Low concentrations of hydromorphone have been detected in human milk in clinical trials. Withdrawal symptoms can occur in breastfeeding infants when maternal administration of an opioid analgesic is stopped. Nursing should not be undertaken while a patient is receiving PALLADONE since hydromorphone is excreted in the milk.

Pediatric Use

The safety and effectiveness of PALLADONE in pediatric patients below the age of 18 have not been established.

Geriatric Use

Elderly patients have been shown to be more sensitive to the adverse effects of opioids compared to the younger population. Of the total number of subjects in clinical studies of Palladone, 22% were 65 and over, and 6% were 75 and over. Dosages should be adjusted according to the clinical situation. As with all opioids, the starting dose should be reduced to 1/3 to ½ of the usual dosage in debilitated patients. Respiratory depression is the chief hazard in elderly or debilitated patients, usually following large initial doses in non-tolerant patients, or when opioids are given in conjunction with other agents that depress respiration. Therefore, closely monitor elderly patients for respiratory and central nervous system depression when prescribing PALLADONE, particularly during initiation and titration.

Hepatic Impairment

PALLADONE was not studied in patients with severe hepatic impairment and are not recommended for use in such patients. Care in initial dose selection and careful observation are recommended in patients with evidence of mild to moderate hepatic impairment.

Renal Impairment

In patients with mild to moderate renal impairment, based on calculated creatinine clearance, the concentrations of hydromorphone in plasma were slightly higher than in subjects with normal renal function.

Hydromorphone may impair the ability to drive and use machines. This is particularly likely at the initiation of treatment with hydromorphone, after dose increase or product rotation and if hydromorphone is combined with alcohol or other CNS depressant substances. Patients stabilised on a specific dosage will not necessarily be restricted. Patients should therefore consult with their physician whether driving or the use of machinery is permitted.

This medicine can impair cognitive function and can affect a patient's ability to drive safely. This class of medicine is in the list of drugs included in regulations under 5a of the Road Traffic Act 1988. When prescribing this medicine, patients should be told:

- The medicine is likely to affect your ability to drive.

- Do not drive until you know how the medicine affects you.

- It is an offence to drive while you have this medicine in your body over a specified limit unless you have a defence (called the 'statutory defence'). This defence applies when:

o The medicine has been prescribed to treat a medical or dental problem; and

o You have taken it according to the instructions given by the prescriber and in the information provided with the medicine.

- Please note that it is still an offence to drive if you are unfit because of the medicine (i.e. your ability to drive is being affected).

Details regarding a new driving offence concerning driving after drugs have been taken in the UK may be found here: https://www.gov.uk/drug-driving-law

The following serious adverse reactions are discussed elsewhere in the labeling:

• Addiction, Abuse, and Misuse
• Life Threatening Respiratory Depression
• Neonatal Opioid Withdrawal Syndrome
• Interactions with Other CNS Depressants
• Hypotensive Effect
• Gastrointestinal Effects
• Seizures

Clinical Trial Experience

The safety of PALLADONE was evaluated in double-blind clinical trials involving 612 patients with moderate to severe pain. An open-label extension study involving 143 patients with cancer pain was conducted to evaluate the safety of PALLADONE when used for longer periods of time in higher doses than in the controlled trials. Patients were treated with doses averaging 40 to 50 mg of PALLADONE per day (ranging between 12 and 500 mg/day) for several months (range 1 to ≥ 52 weeks).

Serious adverse reactions which may be associated with PALLADONE therapy in clinical use are similar to those of other opioid analgesics, including respiratory depression, apnea, respiratory arrest, and to a lesser degree, circulatory depression, hypotension, shock or cardiac arrest.

Adverse Events Reported in Controlled Trials

Table 2 lists treatment emergent signs and symptoms that were reported in at least 2% of patients in the placebo-controlled trials for which the rate of occurrence was greater for those treated with PALLADONE 12 mg capsules than those treated with placebo.

Table 2: Adverse Events Reported in the Placebo-Controlled Clinical Trials with Incidence ≥ 2% in Patients Receiving PALLADONE Capsules for Nonmalignant Pain

Adverse Events Observed in Clinical Trials

PALLADONE has been administered to 785 individuals during completed clinical trials. The conditions and duration of exposure to PALLADONE varied greatly, and included open-label and double-blind studies, uncontrolled and controlled studies, inpatient and outpatient studies, fixed dose and titration studies. Untoward events associated with this exposure were recorded by clinical investigators using terminology of their own choosing.

These categories are used in the listing below. The frequencies represent the proportion of 785 patients from these trials who experienced that event while receiving PALLADONE. All adverse events included in this tabulation occurred in at least one patient. Events are classified by body system and listed using the following definitions: frequent adverse events -those occurring in at least 1/100 patients; adverse events occurring with an incidence less than 1% are considered infrequent. These adverse events are not necessarily related to PALLADONE treatment and in most cases were observed at a similar frequency in placebo-treated patients in the controlled studies.

Frequent Adverse Events

Body as a Whole: headache, asthenia, pain, abdominal pain, fever, chest pain, infection, chills, malaise, neck pain, carcinoma, accidental injury

Cardiovascular System: vasodilatation, tachycardia, migraine

Digestive System: nausea, constipation, vomiting, diarrhea, dyspepsia, anorexia, dry mouth, nausea and vomiting, dysphagia, flatulence

Hemic and Lymphatic System: anemia, leukopenia

Metabolic and Nutritional Disorders: peripheral edema, dehydration, edema, generalized edema, hypokalemia, weight loss

Musculoskeletal: arthralgia, bone pain, leg cramps, myalgia

Nervous System: somnolence, dizziness, nervousness, confusion, insomnia, anxiety, depression, hypertonia, hypesthesia, paresthesia, tremor, thinking abnormal, hallucinations, speech disorder, agitation, amnesia, tinnitus, abnormal gait

Respiratory System: dyspnea, cough increased, rhinitis, pharyngitis, pneumonia, epistaxis, hiccup, hypoxia, pleural effusion

Skin and Appendages: pruritus, sweating, rash

Special Senses: amblyopia, taste perversion

Urogenital System: dysuria, urinary incontinence

Infrequent Adverse Events

Body as a Whole: face edema, ascites, allergic reaction, cellulitis, overdose, hypothermia, neoplasm, photosensitivity reaction, sepsis, flank pain

Cardiovascular System: hypertension, hypotension, syncope, deep thrombophlebitis, arrhythmia, postural hypotension, atrial fibrillation, pallor, bradycardia, electrocardiogram abnormal, myocardial infarction, palpitation, angina pectoris, congestive heart failure, QT interval prolonged, supraventricular tachycardia, thrombosis, cardiomegaly, hemorrhage

Digestive System: fecal impaction, intestinal obstruction, abnormal stools, fecal incontinence, hepatic failure, increased appetite, cholangitis, cholecystitis, colitis, enterocolitis, hepatomegaly, jaundice, liver function tests abnormal, biliary spasm, ileus, eructation, rectal hemorrhage, esophagitis, glossitis, melena, mouth ulceration, gastrointestinal hemorrhage, tongue edema

Endocrine: adrenal cortex insufficiency

Hemic and Lymphatic System: ecchymosis, thrombocytopenia, leukocytosis, lymphadenopathy, agranulocytosis, lymphoma like reaction, pancytopenia, petechia

Metabolic and Nutritional Disorders: hyperglycemia, hyponatremia, cachexia, hypercalcemia, hypomagnesemia, cyanosis, diabetes mellitus, gout, respiratory acidosis, elevated liver enzymes, thirst

Musculoskeletal: myasthenia

Nervous System: abnormal dreams, emotional lability, paranoid reaction, sleep disorder euphoria, incoordination, stupor, ataxia, convulsion, hallucination, hostility, myoclonus, psychosis, vertigo, withdrawal syndrome, apathy, delirium, dementia, drug dependence, nystagmus, twitching, depersonalization, aphasia, cerebrovascular accident, circumoral parasthesia, seizure, hyperkinesia, hypotonia, increased salivation, neuralgia

Respiratory System: hypoventilation, apnea, atelectasis, hemoptysis, asthma, hyperventilation, pulmonary embolus, laryngismus

Skin and Appendages: urticaria, maculopapular rash, alopecia

Special Senses: abnormal vision, diplopia, dry eyes, lacrimation disorder, hyperacusis

Urogenital: urinary retention, hematuria, impotence, urinary frequency, urination impaired, dysmenorrhea, creatinine increased, urinary urgency

Additional Adverse Events From Non-U.S. Experience

Addiction, blurred vision, drowsiness, dysphoria, sedation, seizure, physical dependence, biliary spasm, and ileus

Clinical Presentation

Acute overdosage with opioids can be manifested by respiratory depression, somnolence progressing to stupor or coma, skeletal muscle flaccidity, cold and clammy skin, constricted pupils, and sometimes pulmonary edema, bradycardia, hypotension and death. Marked mydriasis rather than miosis may be seen due to severe hypoxia in overdose situations.

Treatment of Overdose

In case of overdose, priorities are the re-establishment of a patent and protected airway and institution of assisted or controlled ventilation if needed. Employ other supportive measures (including oxygen, vasopressors) in the management of circulatory shock and pulmonary edema as indicated. Cardiac arrest or arrhythmias will require advanced life support techniques.

The opioid antagonists, such as naloxone and naltrexone, are specific antidotes to respiratory depression resulting from opioid overdose. Opioid antagonists should not be administered in the absence of clinically significant respiratory or circulatory depression secondary to hydromorphone overdose. Such agents should be administered cautiously to patients who are known, or suspected to be, physically dependent on PALLADONE. In such cases, an abrupt or complete reversal of opioid effects may precipitate an acute withdrawal syndrome.

Because the duration of reversal would be expected to be less than the duration of action of hydromorphone in PALLADONE, carefully monitor the patient until spontaneous respiration is reliably re-established. PALLADONE will continue to release hydromorphone adding to the hydromorphone load for up to 24 hours after administration, necessitating prolonged monitoring for at least 24 to 48 hours beyond the overdose. If the response to opioid antagonists is suboptimal or not sustained, additional antagonist should be given as directed in the product's prescribing information.

In an individual physically dependent on opioids, administration of an opioid receptor antagonist may precipitate an acute withdrawal. The severity of the withdrawal syndrome produced will depend on the degree of physical dependence and the dose of the antagonist administered. If a decision is made to treat serious respiratory depression in the physically dependent patient, administration of the antagonist should be begun with care and by titration with smaller than usual doses of the antagonist.

CNS Depressant/Alcohol Interaction

Additive pharmacodynamic effects may be expected when PALLADONE is used in conjunction with alcohol, other opioids, legal or illicit drugs that cause central nervous system depression.

Effects on the Central Nervous System

Hydromorphone produces dose-related respiratory depression by direct action on brain stem respiratory centers. The respiratory depression involves a reduction in the responsiveness of the brain stem respiratory centers to increases in carbon dioxide tension and to electrical stimulation.

Hydromorphone depresses the cough reflex by direct effect on the cough center in the medulla.

Hydromorphone causes miosis, even in total darkness. Pinpoint pupils are a sign of opioid overdose but are not pathognomic. Marked mydriasis, rather than miosis, may be seen due to severe hypoxia in overdose situations.

Effects on the Gastrointestinal Tract and Other Smooth Muscle

Gastric, biliary and pancreatic secretions are decreased by hydromorphone. Hydromorphone causes a reduction in motility associated with an increase in tone in the antrum of the stomach and duodenum. Digestion of food in the small intestine is delayed and propulsive contractions are decreased. Propulsive peristaltic waves in the colon are decreased, while tone may be increased to the point of spasm. The end result is constipation. Hydromorphone also can cause an increase in biliary tract pressure as a result of spasm of the sphincter of Oddi.

Effects on the Cardiovascular System

Hydromorphone produces peripheral vasodilation which may result in orthostatic hypotension or syncope. Release of histamine may be induced by hydromorphone and can contribute to opioid-induced hypotension.

Manifestations of histamine release or peripheral vasodilation may include pruritus, flushing, red eyes, and sweating.

Effects on the Endocrine System

Opioids inhibit the secretion of ACTH, cortisol, and luteinizing hormone (LH) in humans. They also stimulate prolactin, growth hormone (GH) secretion, and pancreatic secretion of insulin and glucagon.

Effects on the Immune System

Opioids have been shown to have a variety of effects on components of the immune system in in vitro and animal models. The clinical significance of these findings is unknown. Overall, the effects of opioids appear to be modestly immunosuppressive.

Absorption

PALLADONE is an extended-release formulation of hydromorphone. Administration of a single PALLADONE dose is characterized by biphasic absorption, a relatively rapid rise to an initial peak concentration, followed by a second broader peak with therapeutic plasma concentrations maintained over the 24-hour dosing interval. The absolute bioavailability of hydromorphone from PALLADONE has not been determined. Under conditions of multiple dosing, the bioavailability of a once-daily dose of PALLADONE is equivalent to the same total daily dose of immediate-release hydromorphone given in divided doses every 6 hours. Dose proportionality has been established in terms of Cmax and AUC for the 12 mg and 24 mg dosage strengths. Dosage form proportionality on a dose-adjusted basis has been demonstrated for three 12 mg capsules to one 32 mg capsule.

In a study comparing 12 mg PALLADONE dosed every 24 hours to 3 mg of immediate-release hydromorphone dosed every 6 hours in healthy human subjects, the two treatments were found to be equivalent in terms of extent of absorption (AUC) (see Figure 1). The extended-release characteristics of PALLADONE resulted in lower steady-state peak levels (Cmax), higher trough levels (Cmin), and an approximately twofold to threefold reduction in the fluctuation seen with the immediate-release hydromorphone tablets.

Figure 1: Steady-State Plasma Hydromorphone Concentration-Time Curves

Steady-state plasma concentrations with PALLADONE were achieved within 2 to 3 days after initiation of dosing. This is consistent with the mean apparent terminal elimination half-life for PALLADONE of approximately 18.6 hours. Hydromorphone did not accumulate significantly after multiple dosing with once-daily administration.

Food had no significant effect on the peak (Cmax), AUC or the elimination of hydromorphone from PALLADONE (see Figure 2).

Figure 2: Single-Dose Palladone™ Pharmacokinetic Profiles

Food Effect

The pharmacokinetics of PALLADONE is not affected by food as indicated by bioequivalence when administered under fed and fasting conditions. Therefore, PALLADONE may be administered without regard to meals.

Distribution

Following intravenous administration of hydromorphone, the reported volume of distribution is 295 L (4 L/kg). Hydromorphone is approximately 20% bound to human plasma proteins.

Metabolism

Hydromorphone is metabolized by direct conjugation, or by 6-keto reduction followed by conjugation. Following absorption, hydromorphone is metabolized to the major metabolites hydromorphone-3glucuronide, hydromorphone-3-glucoside and dihydroisomorphine-6-glucuronide. Also observed were the less prevalent metabolites, dihydroisomorphine-6-glucoside, dihydromorphine and dihydroisomorphine.

Hydromorphone metabolites have been found in plasma, urine and in human hepatocyte test systems. However, it is not known whether hydromorphone is metabolized by the cytochrome P450 enzyme system. Hydromorphone is a poor inhibitor of human recombinant CYP isoforms including CYP1A2, 2A6, 2C8, 2D6, and 3A4 with an IC50 > 50 μM. Therefore, hydromorphone is not expected to inhibit the metabolism of other drugs metabolized by these CYP isoforms.

Non-clinical data reveal no special hazard for humans based on conventional studies of safety pharmacology, repeated dose toxicity and genotoxicity.

No effects on male or female fertility or sperm parameters were observed in rats at oral hydromorphone doses of 5 mg/kg/day (30 mg/m²/day, which is 1.4 times higher than the expected human dose on a body surface area basis).

Hydromorphone was not teratogenic in rats and rabbits at doses that caused maternal toxicity. Reduced foetal development was found in rabbits at doses of 50 mg/kg (developmental no-effect level was established at a dose of 25 mg/kg or 380 mg/m² at an active substance exposure (AUC) almost four times above the one expected in humans). No evidence of foetal toxicity was observed in rats treated with oral hydromorphone doses as high as 10 mg/kg (308 mg/m² with an AUC about 1.8 times above the one expected in humans).

Perinatum and postpartum rat pup (F1) mortality was increased at doses of 2 and 5 mg/kg/day and bodyweights were reduced during lactation period.

Long-term carcinogenicity studies have not been performed.