Components:
Medically reviewed by Kovalenko Svetlana Olegovna, PharmD. Last updated on 11.05.2022
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Guaifenesin and hydrocodone is used to treat cough and reduce chest congestion caused by the common cold, flu, or allergies.
Geri-Guaifenesin Expectorant is used to reduce chest congestion caused by the common cold, flu, or chronic bronchitis.
Geri-Guaifenesin Expectorant helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.
There are many brands and forms of guaifenesin available. Not all brands are listed on this leaflet.
Geri-Guaifenesin Expectorant may also be used for purposes not listed in this medication guide.
ORGANIDIN® NR (guaifenesin)
Tablets — Adults and children 12 years of age and older: One to 2 tablets (200 mg to 400 mg) every four hours, not to exceed 2400 mg (12 tablets) in 24 hours.
PATIENTS SHOULD BE ADVISED TO KEEP THESE AND ALL DRUGS OUT OF THE REACH OF CHILDREN AND TO SEEK PROFESSIONAL ASSISTANCE OR CONTACT A POISON CONTROL CENTER IMMEDIATELY IN CASE OF ACCIDENTAL OVERDOSE.
How supplied
ORGANIDIN® NR (guaifenesin)
Tablets — Each round, scored, rose-colored tablet contains 200 mg guaifenesin USP—available in bottles of 100 (NDC 0037-4312-01)
Storage
Store at controlled room temperature 20°-25°C (68°-77°F). Protect tablets from moisture. Keep bottle tightly closed.
To report SUSPECTED ADVERSE REACTIONS, contact Meda Pharmaceuticals Inc. at 1-800-526-3840 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Meda Pharmaceuticals Inc. Somerset, New Jersey 08873-4120. Rev. 11/09
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What is the most important information I should know about Vitamin C?
AV-block II and III degree, sinoatrial block, SSS, bradycardia (HR < 40 bpm), hypotension (in case of myocardial infarction, systolic blood pressure less than 100 mm Hg), cardiogenic shock, congestive heart failure IIB-III stages, acute heart failure, Prinzmetal's angina, lactation, concomitant use of MAO inhibitors, hypersensitivity to atenolol.
Use Guaifenesin as directed by your doctor. Check the label on the medicine for exact dosing instructions.
- Take Guaifenesin by mouth with or without food.
- Drinking extra fluids while you are taking Guaifenesin is recommended. Check with your doctor for instructions.
- Swallow Guaifenesin whole. Do not break, crush, or chew before swallowing.
- If you miss a dose of Guaifenesin and you are taking it regularly, take it as soon as possible. If it is almost time for your next dose, skip the missed dose. Go back to your regular dosing schedule. Do not take 2 doses at once.
Ask your health care provider any questions you may have about how to use Guaifenesin.
There are specific as well as general uses of a drug or medicine. A medicine can be used to prevent a disease, treat a disease over a period or cure a disease. It can also be used to treat the particular symptom of the disease. The drug use depends on the form the patient takes it. It may be more useful in injection form or sometimes in tablet form. The drug can be used for a single troubling symptom or a life-threatening condition. While some medications can be stopped after few days, some drugs need to be continued for prolonged period to get the benefit from it.Guaifenesin is used to treat coughs and congestion caused by the common cold, bronchitis, and other breathing illnesses. This product is usually not used for ongoing cough from smoking or long-term breathing problems (such as chronic bronchitis, emphysema) unless directed by your doctor. Guaifenesin is an expectorant. It works by thinning and loosening mucus in the airways, clearing congestion, and making breathing easier.
If you are self-treating with this medication, it is important to read the package instructions carefully before you start using this product to be sure it is right for you.
Cough-and-cold products have not been shown to be safe or effective in children younger than 6 years. Therefore, do not use this product to treat cold symptoms in children younger than 6 years unless specifically directed by the doctor. Some products (such as long-acting tablets/capsules) are not recommended for use in children younger than 12 years. Ask your doctor or pharmacist for more details about using your product safely.
These products do not cure or shorten the length of the common cold. To decrease the risk for side effects, carefully follow all dosage directions. Do not give other cough-and-cold medication that might contain the same or similar ingredients. Ask the doctor or pharmacist about other ways to relieve cough and cold symptoms (such as drinking enough fluids, using a humidifier or saline nose drops/spray).
How to use 2/G
Take this medication by mouth with or without food, as directed by your doctor, usually every 4 hours. If you are self-treating, follow all directions on the product package. If you are uncertain about any of the information, ask your doctor or pharmacist.
Guaifenesin may have a bitter taste. Do not split the tablets unless they have a score line and your doctor or pharmacist tells you to do so. Swallow the whole or split tablet without crushing or chewing.
If you are using the liquid form of this medication, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose.
For powder packets, empty the entire contents of the packet onto the tongue and swallow. To prevent a bitter taste, do not chew.
Dosage is based on your age, medical condition, and response to treatment. Do not take more than 6 doses in a day. Do not increase your dose or take this drug more often than directed.
Drink plenty of fluids while taking this medication. Fluids will help to break up mucus and clear congestion.
Tell your doctor if your cough is accompanied by fever, severe sore throat, rash, persistent headache, or if it persists, returns, or worsens after 7 days. These may be signs of a serious medical problem. Seek immediate medical attention if you think you may have a serious medical problem.
See also:
What other drugs will affect Guaifenesin?
In vitro results suggest that methadone undergoes hepatic N-demethylation by cytochrome P450 enzymes, principally CYP3A4, CYP2B6, CYP2C19 and to a lesser extent by CYP2C9 and CYP2D6. Coadministration of methadone with CYP inducers of these enzymes may result in a more rapid metabolism and potential for decreased effects of methadone, whereas administration with CYP inhibitors may reduce metabolism and potentiate methadones effects. Although antiretroviral drugs such as efavirenz, nelfinavir, nevirapine, ritonavir, lopinavir+ritonavir combination are known to inhibit CYPs, they are shown to reduce the plasma levels of methadone, possibly due to their CYP induction activity. Therefore, drugs administered concomitantly with methadone should be evaluated for interaction potential; clinicians are advised to evaluate individual response to drug therapy.
Opioid Antagonists, Mixed Agonist/Antagonists, and Partial Agonists
As with other mu-agonists, patients maintained on methadone may experience withdrawal symptoms when given opioid antagonists, mixed agonist/antagonists, and partial agonists. Examples of such agents are naloxone, naltrexone, pentazocine, nalbuphine, butorphanol, and buprenorphine.
Anti-retroviral Agents
Abacavir, amprenavir, efavirenz, nelfinavir, nevirapine, ritonavir, lopinavir+ritonavir combination - Coadministration of these anti-retroviral agents resulted in increased clearance or decreased plasma levels of methadone. Guaifenesin-maintained patients beginning treatment with these antiretroviral drugs should be monitored for evidence of withdrawal effects and methadone dose should be adjusted accordingly.
Didanosine and Stavudine - Experimental evidence demonstrated that methadone decreased the AUC and peak levels for didanosine and stavudine, with a more significant decrease for didanosine. Guaifenesin disposition was not substantially altered.
Zidovudine - Experimental evidence demonstrated that methadone increased the area under the concentration-time curve (AUC) of zidovudine which could result in toxic effects.
Cytochrome P450 Inducers
Guaifenesin-maintained patients beginning treatment with CYP3A4 inducers should be monitored for evidence of withdrawal effects and methadone dose should be adjusted accordingly. The following drug interactions were reported following coadministration of methadone with inducers of cytochrome P450 enzymes:
Rifampin - In patients well-stabilized on methadone, concomitant administration of rifampin resulted in a marked reduction in serum methadone levels and a concurrent appearance of withdrawal symptoms.
Phenytoin - In a pharmacokinetic study with patients on methadone maintenance therapy, phenytoin administration (250 mg b.i.d. initially for 1 day followed by 300 mg QD for 3 to 4 days) resulted in an approximately 50% reduction in methadone exposure and withdrawal symptoms occurred concurrently. Upon discontinuation of phenytoin, the incidence of withdrawal symptoms decreased and methadone exposure increased to a level comparable to that prior to phenytoin administration.
St. Johns Wort, Phenobarbital, Carbamazepin/strong>Administration of methadone along with other CYP3A4 inducers may result in withdrawal symptoms. Since the metabolism of methadone is mediated primarily by CYP3A4 isozyme, coadministration of drugs that inhibit CYP3A4 activity may cause decreased clearance of methadone. The expected clinical results would be increased or prolonged opioid effects. Thus, methadone-treated patients coadministered strong inhibitors of CYP3A4, such as azole antifungal agents (e.g., ketoconazole) and macrolide antibiotics (e.g., erythromycin), with methadone should be carefully monitored and dosage adjustment should be undertaken if warranted. Some selective serotonin reuptake inhibitors (SSRIs) (e.g., sertraline, fluvoxamine) may increase methadone plasma levels upon coadministration with methadone and result in increased opiate effects and/or toxicity. Voriconazole - Repeat dose administration of oral voriconazole (400mg Q12h for 1 day, then 200mg Q12h for 4 days) increased the Cmax and AUC of (R)-methadone by 31% and 47%, respectively, in subjects receiving a methadone maintenance dose (30 to 100 mg QD). The Cmax and AUC of (S)-methadone increased by 65% and 103%, respectively. Increased plasma concentrations of methadone have been associated with toxicity including QT prolongation. Frequent monitoring for adverse events and toxicity related to methadone is recommended during coadministration. Dose reduction of methadone may be needed. Monoamine Oxidase (MAO) Inhibitors - Therapeutic doses of meperidine have precipitated severe reactions in patients concurrently receiving monoamine oxidase inhibitors or those who have received such agents within 14 days. Similar reactions thus far have not been reported with methadone. However, if the use of methadone is necessary in such patients, a sensitivity test should be performed in which repeated small, incremental doses of methadone are administered over the course of several hours while the patients condition and vital signs are under careful observation. Desipramine - Blood levels of desipramine have increased with concurrent methadone administration. Extreme caution is necessary when any drug known to have the potential to prolong the QT interval is prescribed in conjunction with methadone. Pharmacodynamic interactions may occur with concomitant use of methadone and potentially arrhythmogenic agents such as class I and III antiarrhythmics, some neuroleptics and tricyclic antidepressants, and calcium channel blockers. Caution should also be exercised when prescribing methadone concomitantly with drugs capable of inducing electrolyte disturbances (hypomagnesemia, hypokalemia) that may prolong the QT interval. These drugs include diuretics, laxatives, and, in rare cases, mineralocorticoid hormones. Guaifenesin may be expected to have additive effects when used in conjunction with alcohol, other opioids or CNS depressants, or with illicit drugs that cause central nervous system depression. Deaths have been reported when methadone has been abused in conjunction with benzodiazepines. Anxiety - Since methadone as used by tolerant patients at a constant maintenance dosage does not act as a tranquilizer, patients who are maintained on this drug will react to life problems and stresses with the same symptoms of anxiety as do other individuals. The physician should not confuse such symptoms with those of narcotic abstinence and should not attempt to treat anxiety by increasing the dose of methadone. The action of methadone in maintenance treatment is limited to the control of narcotic withdrawal symptoms and is ineffective for relief of general anxiety. Acute Pain - Maintenance patients on a stable dose of methadone who experience physical trauma, postoperative pain or other acute pain cannot be expected to derive analgesia from their existing dose of methadone. Such patients should be administered analgesics, including opioids, in doses that would otherwise be indicated for non-methadone-treated patients with similar painful conditions. Due to the opioid tolerance induced by methadone, when opioids are required for management of acute pain in methadone patients, somewhat higher and/or more frequent doses will often be required than would be the case for non-tolerant patients. Abrupt opioid discontinuation can lead to development of opioid withdrawal symptoms. Presentation of these symptoms have been associated with an increased risk of susceptible patients to relapse to illicit drug use and should be considered when assessing the risks and benefit of methadone use. Tolerance is the need for increasing doses of opioids to maintain a defined effect such as analgesia (in the absence of disease progression or other external factors). Physical dependence is manifested by withdrawal symptoms after abrupt discontinuation of a drug or upon administration of an antagonist. Physical dependence and/or tolerance are not unusual during chronic opioid therapy. If methadone is abruptly discontinued in a physically dependent patient, an abstinence syndrome may occur. The opioid abstinence or withdrawal syndrome is characterized by some or all of the following: restlessness, lacrimation, rhinorrhea, yawning, perspiration, chills, myalgia, and mydriasis. Other symptoms also may develop, including irritability, anxiety, backache, joint pain, weakness, abdominal cramps, insomnia, nausea, anorexia, vomiting, diarrhea, or increased blood pressure, respiratory rate, or heart rate. In general, chronically administered methadone should not be abruptly discontinued. Guaifenesin should be given with caution and the initial dose reduced in certain patients, such as the elderly and debilitated and those with severe impairment of hepatic or renal function, hypothyroidism, Addisons disease, prostatic hypertrophy, or urethral stricture. The usual precautions appropriate to the use of parenteral opioids should be observed and the possibility of respiratory depression should always be kept in mind. See also: Applies to guaifenesin: oral capsule, oral capsule extended release, oral elixir, oral liquid, oral packet, oral solution, oral syrup, oral tablet, oral tablet extended release In addition to its needed effects, some unwanted effects may be caused by guaifenesin (the active ingredient contained in Guaifenesin). In the event that any of these side effects do occur, they may require medical attention. Some of the side effects that can occur with guaifenesin may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional: Less common or rare: See also: Guaifenesin is contraindicated in patients with a known hypersensitivity to methadone hydrochloride or any other ingredient in DOLOPHINE. Guaifenesin is contraindicated in any situation where opioids are contraindicated such as: patients with respiratory depression (in the absence of resuscitative equipment or in unmonitored settings), and in patients with acute bronchial asthma or hypercarbia. Guaifenesin is contraindicated in any patient who has or is suspected of having a paralytic ileus. Metamizole tablets are used for the treatment of pains of different origin and variable intensity: toothache, headache, arthralgia, neuralgia, myositis, mild to moderate visceral pain, high fever, not responding to other drugs. Metamizole is used to treat pain of different origins such as toothache, headache, visceral pain or high fever. It is also used to treat severe pain associated with surgeries, cancer or stomach problems. A thioureylene antithyroid agent that inhibits the formation of thyroid hormones by interfering with the incorporation of iodine into tyrosyl residues of thyroglobulin. This is done by interfering with the oxidation of iodide ion and iodotyrosyl groups through inhibition of the peroxidase enzyme. The dosing regimen of Metamizole is individual. When this medication is administered orally of the single dose is 20-40 mg. The daily dose is 20-80 mg, the frequency of use is 1-2 times / day. The duration of treatment is 2-8 weeks. With the simultaneous use with inducers of microsomal liver enzymes, means having hepatotoxic effect, increasing the risk of hepatotoxic action of paracetamol. With the simultaneous use of anticoagulants may be slight to moderate increase in prothrombin time. With the simultaneous use of anticholinergics may decrease absorption of paracetamol. With the simultaneous use of oral contraceptives accelerated excretion of paracetamol from the body and may reduce its analgesic action. With the simultaneous use with urological means reduced their effectiveness. With the simultaneous use of activated charcoal reduced bioavailability of paracetamol. When Metamizole Mount Mettur Pharmaceuticals applied simultaneously with diazepam may decrease excretion of diazepam. There have been reports about the possibility of enhancing mielodepression effect of zidovudine while applying with paracetamol. A case of severe toxic liver injury. Described cases of toxic effects of paracetamol, while the use of isoniazid. When applied simultaneously with carbamazepine, phenytoin, phenobarbital, primidonom decreases the effectiveness of paracetamol, which is caused by an increase in its metabolism and excretion from the body. Cases of hepatotoxicity, while the use of paracetamol and phenobarbital. In applying cholestyramine a period of less than 1 h after administration of paracetamol may decrease of its absorption. At simultaneous application with lamotrigine moderately increased excretion of lamotrigine from the body. With the simultaneous use of metoclopramide may increase absorption of paracetamol and its increased concentration in blood plasma. When applied simultaneously with probenecid may decrease clearance of paracetamol, with rifampicin, sulfinpyrazone - may increase clearance of paracetamol due to increasing its metabolism in the liver. At simultaneous application of Metamizole Mount Mettur Pharmaceuticals with ethinylestradiol increases absorption of paracetamol from the gut. Enhances the effect of indirect anticoagulants (coumarin derivatives and indandione). Antipyretic and analgesic activity of caffeine increases, reduce - rifampicin, phenobarbital and alcohol (accelerated biotransformation, inducing microsomal liver enzymes). May be nausea, vomiting, diarrhea or constipation, urticaria, hypersensitivity to the drug. Rarely granulocytopenia, epigastric pain, stomatitis. Regardless of the dose, Metamizole magnesium (Metamizole) can occasionally determine hypersensitivity, externalized, such as rash, leukopenia and rarely agranulocytosis, as well as fragments of impact or shock. Presented unfamiliar or unpleasant sensations impaired skin and mucous membranes, will need to stop and seek medical preparations. If it had been observed previously and phenomena of intolerance to other analgesics or anti-flu preparations, consult your doctor before applying Metamizole magnesium (Metamizole). After intravenous injection, there may be dizziness, feeling of oppression and demonstrations by the CNS, without allergic genesis. After intravenous injection, there may be dizziness, feeling of oppression and demonstrations by the CNS, without allergic genesis. These side effects are largely avoided by slow injection (1 to 1.5 ml per minute). Rarely, injection Metamizole magnesium (Metamizole), depending on the dose may lead to hypotension, without hypersensitivity reactions. Active gastroduodenal ulcer, liver failure, hepatitis, nephritis, blood dyscrasias, cardiac failure, oliguria. Do not be administered for prolonged periods. Metamizole magnesium (Metamizole) has not administered in case of allergy to pyrazolone (eg, hypersensitivity to drugs with Metamizole magnesium, isopirina, propyphenazone, phenazone or phenylbutazone), and certain metabolic disorders (hepatic porphyria, congenital deficiency of glucose-6-phosphate dehydrogenase), patients with hypersensitivity to analgesics (pain relievers asthma) infants during the first three months and less than 5 kg of weight, patients with blood pressure below 100 mm Hg or movement unstable hematopoiesis and injured patients. Ascorbic acid (vitamin C) occurs naturally in foods such as citrus fruit, tomatoes, potatoes, and leafy vegetables. Vitamin C is important for bones and connective tissues, muscles, and blood vessels. Vitamin C also helps the body absorb iron, which is needed for red blood cell production. Ascorbic acid is used to treat and prevent vitamin C deficiency. Ascorbic acid may also be used for purposes not listed in this medication guide. For systemic use of Vitamin C: prevention and treatment of hypo- and avitaminosis of vitamin C; providing increased need for vitamin C during growth, pregnancy, lactation, with heavy loads, fatigue and during recovery after prolonged severe illness; in winter with an increased risk of infectious diseases. For intravaginal use: chronic or recurrent vaginitis (bacterial vaginosis, nonspecific vaginitis) caused by the anaerobic flora (due to changes in pH of the vagina) in order to normalize disturbed vaginal microflora. Ascorbic acid (vitamin C) is used to prevent or treat low levels of vitamin C in people who do not get enough of the vitamin from their diets. Most people who eat a normal diet do not need extra ascorbic acid. Low levels of vitamin C can result in a condition called scurvy. Scurvy may cause symptoms such as rash, muscle weakness, joint pain, tiredness, or tooth loss. Vitamin C plays an important role in the body. It is needed to maintain the health of skin, cartilage, teeth, bone, and blood vessels. It is also used to protect your body's cells from damage. It is known as an antioxidant. OTHER USES: This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional. This vitamin may also be used with other vitamins for a certain eye condition (macular degeneration). Take this vitamin by mouth with or without food, usually 1 to 2 times daily. Follow all directions on the product package, or take as directed by your doctor. If you are taking the extended-release capsules, swallow them whole. Do not crush or chew extended-release capsules or tablets. Doing so can release all of the drug at once, increasing the risk of side effects. Also, do not split extended-release tablets unless they have a score line and your doctor or pharmacist tells you to do so. Swallow the whole or split tablet without crushing or chewing. Take this product with a full glass of water (8 ounces/240 milliliters) unless your doctor directs you otherwise. If you are taking the wafers or chewable tablets, chew them thoroughly and then swallow. If you are taking the lozenges, place the lozenge in your mouth and allow it to slowly dissolve. If you are taking the powder, mix it thoroughly in the proper amount of liquid and stir well. Drink all of the liquid right away. Do not prepare a supply for future use. If you are using the liquid form of this vitamin, carefully measure the dose using a special measuring device/spoon. Do not use a household spoon because you may not get the correct dose. Dosage is based on your medical condition and response to treatment. Use this vitamin regularly to get the most benefit from it. To help you remember, take it at the same time(s) each day. If you think you may have a serious medical problem, seek immediate medical attention. A six carbon compound related to glucose. It is found naturally in citrus fruits and many vegetables. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone. Its biologically active form, vitamin C, functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant. This medication administered orally, IM, IV, intravaginally. For the prevention of deficiency conditions Vitamin C dose is 25-75 mg / day, for the treatment - 250 mg / day or more in divided doses. For intravaginal used ascorbic acid drugs in appropriate dosage forms. See also: In an application with barbiturates, primidone increases the excretion of ascorbic acid in the urine. With the simultaneous use of oral contraceptives reduces the concentration of ascorbic acid in blood plasma. In an application of Vitamin C with iron preparations ascorbic acid, due to its regenerative properties, transforms ferric iron in the bivalent, which improves its absorption. Ascorbic acid in high doses can decrease urine pH that while the application reduces the tubular reabsorption of amphetamine and tricyclic antidepressants. With the simultaneous use of aspirin reduces the absorption of ascorbic acid by about a third. Vitamin C in an application with warfarin may decrease effects of warfarin. With the simultaneous application of ascorbic acid increases the excretion of iron in patients receiving deferoxamine. In the application of ascorbic acid at a dose of 500 mg / day possibly left ventricular dysfunction. In an application with tetracycline is increased excretion of ascorbic acid in the urine. There is a described case of reducing the concentration of fluphenazine in plasma in patients treated with ascorbic acid 500 mg 2 times / day. May increase the concentration of ethinyl estradiol in the blood plasma in its simultaneous application in the oral contraceptives. See also: Applies to ascorbic acid: oral capsule, oral capsule extended release, oral capsule liquid filled, oral granule, oral liquid, oral lozenge/troche, oral powder, oral powder for solution, oral powder for suspension, oral solution, oral syrup, oral tablet, oral tablet chewable, oral tablet extended release, oral wafer As well as its needed effects, ascorbic acid (the active ingredient contained in Vitamin C) may cause unwanted side effects that require medical attention. If any of the following side effects occur while taking ascorbic acid, check with your doctor or nurse as soon as possible: Less common or rare: - with high doses Cytochrome P450 Inhibitors
Others
Potentially Arrhythmogenic Agents
Interactions with Alcohol and Drugs of Abuse
Risk of Relapse in Patients on Guaifenesin Maintenance Treatment of Opioid Addiction
Tolerance and Physical Dependence
Special-Risk Patients
Guaifenesin side effects
What are the possible side effects of Guaifenesin?
Minor Side Effects
Guaifenesin contraindications
What is the most important information I should know about Guaifenesin?Metamizole indications
Uses of Metamizole in details
Metamizole description
Metamizole dosage
Metamizole interactions
Metamizole side effects
Metamizole contraindications
What is Vitamin C?
Vitamin C indications
Uses of Vitamin C in details
How to use Vitamin C
Vitamin C description
Vitamin C dosage
Vitamin C interactions
What other drugs will affect Vitamin C?Vitamin C side effects
What are the possible side effects of Vitamin C?Severity: Moderate
Minor Side Effects
Some ascorbic acid side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:
Less common or rare: - with high doses
- Diarrhea
- dizziness or faintness (with the injection only)
- flushing or redness of skin
- headache
- increase in urination (mild)
- nausea or vomiting
- stomach cramps
A synthetic opioid that is used as the hydrochloride. It is an opioid analgesic that is primarily a mu-opioid agonist. It has actions and uses similar to those of morphine. It also has a depressant action on the cough center and may be given to control intractable cough associated with terminal lung cancer. Guaifenesin is also used as part of the treatment of dependence on opioid drugs, although prolonged use of methadone itself may result in dependence. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1082-3)