Biopin

Quick links to important sections

Biopin

Selected form

Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Biopin

What is Biopin? Defining the Drug Entity and Its Class

Property Description
Active Ingredient Dosulepin Hydrochloride
Form Oral Tablet
Pharmacological Class Tricyclic Antidepressant (TCA)
Common Use Management of persistent low mood and associated symptoms
Origin Synthetic Chemical (Dibenzoxepin Derivative)

Biopin is the commercial designation for a prescription medicine containing the active substance Dosulepin Hydrochloride, which is internationally recognized and was formerly known as Dothiepin. It is officially classified as a Tricyclic Antidepressant (TCA), positioning it within the broader psychotherapeutic category used for mood disorders. Dosulepin is an established TCA used for treating depression and related conditions in adults. This indicates that the medication is recognized by major official bodies for managing mood disturbances.

Composition, Origin, and Foundational Benefit

The core of Biopin is Dosulepin Hydrochloride, a synthetic chemical entity that structurally falls under the category of Dibenzoxepin Derivatives. This product is a single-active ingredient medication manufactured for oral administration and is typically presented in the solid pharmaceutical form of a tablet. Unlike many newer antidepressants, Dosulepin is clinically recognized for its robust and relatively fast-acting sedative properties, a feature useful for patients whose mood disorders are accompanied by significant anxiety or insomnia.

The compound's fundamental action is that of a non-selective monoamine reuptake inhibitor, meaning it works by blocking the reabsorption of key chemical messengers—primarily serotonin and norepinephrine—in the brain. By increasing the availability of these neurotransmitters at the synapses, Dosulepin helps to stabilize emotional states, providing a general therapeutic benefit in promoting mood elevation and reducing profound emotional distress.

What side effects are possible with Biopin?

Possible Side Effects and Safety Information for Biopin

Biopin (naltrexone implant) is associated with an established safety profile based on the active ingredient and the delivery method. Adverse reactions observed in clinical settings are typically classified by frequency and body system.

Common and Serious Adverse Reactions

Common side effects often include reactions at the injection or implant site, such as pain, swelling, tenderness, or bruising, which are generally expected with subcutaneous implants. Other frequently reported reactions include headache, nausea, and fatigue. Some patients may also experience sleep disturbances or changes in mood.

Serious and clinically significant adverse reactions require careful monitoring and attention from a healthcare provider. These include the potential for:

  • Hepatotoxicity: Liver injury or hepatitis has been reported with naltrexone use and can manifest as signs like upper right abdominal pain, dark urine, or yellowing of the skin or eyes (jaundice).
  • Increased Opioid Sensitivity: After stopping Biopin treatment, patients may have a reduced tolerance to opioids. Using the same amount of opioids as before treatment could lead to life-threatening overdose.
  • Severe Allergic Reactions: While rare, serious allergic reactions (anaphylaxis), including swelling of the face, throat, or tongue, and difficulty breathing, have occurred.
  • Depression and Suicidality: Patients should be monitored for new or worsening depression and suicidal ideation, a risk associated with medication use in certain populations.

Safety Considerations and Restrictions

Biopin is contraindicated in patients who are currently receiving opioid analgesics or who are physically dependent on opioids, as this could precipitate severe withdrawal symptoms. All patients must be opioid-free for a specified period before initiation.

Specific population safety notes exist for pregnant or breastfeeding individuals, and the elderly, where the use of Biopin requires an assessment of potential risks versus benefits. Caution is also advised in patients with existing kidney or liver impairment, as this may affect the body's processing of the medication.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Biopin (Dosulepin Hydrochloride) defines overdose as a critical, potentially life-threatening event requiring immediate medical intervention.

Documented Overdose Manifestations

System Documented Signs and Symptoms
Central Nervous System (CNS) Drowsiness, confusion, ataxia, muscle twitching, convulsions, delirium, and coma.
Cardiovascular System Tachycardia, severe hypotension, conduction defects (e.g., QRS widening), and life-threatening ventricular arrhythmias.

Life-Threatening Outcomes and Required Actions

Dosulepin is associated with a low margin of safety and high mortality in overdose. Severe toxicity can develop rapidly, typically within 4–6 hours of ingestion, escalating to circulatory collapse or refractory seizures.

All individuals with a suspected overdose must seek IMMEDIATE MEDICAL ATTENTION. The regulatory guidance mandates that symptomatic patients, as well as all children who have ingested any amount, be referred for hospital observation.

No specific antidote is known for Dosulepin overdose; management is defined as primarily symptomatic and supportive. This care may include procedures like gastric lavage, administering activated charcoal, and continuous ECG monitoring due to the high risk of cardiac instability. Specific interventions, such as alkalinisation with sodium bicarbonate, are described for managing certain cardiac toxicities. Elderly patients are specifically noted in official labeling to have an increased risk of severe cardiovascular toxicity during overdose.

Therapeutic Uses of Biopin

What Biopin Treats: Main Uses and Benefits

Biopin (Dosulepin Hydrochloride) is commonly used in clinical settings that involve acute or unstable symptom patterns associated with depressive illness. It is applied in contexts where a patient is intolerant of or unresponsive to alternative treatments, offering additional symptomatic support.

The medication is relevant for easing symptom clusters that may become intense or disruptive across several therapeutic areas: Major Depressive Disorder (MDD) and other depressive illnesses; management of co-occurring anxiety and insomnia; and supportive use for specific chronic pain syndromes, such as neuropathic pain.

This medication is used for the treatment of depressive illness, especially where an anti-anxiety effect is required. It contributes to easing the overall symptom load by supporting mood elevation and providing a calming effect, which may assist with managing sleep disturbances.


Quick Fact: Relief for Significant Anxiety

Biopin is commonly used to help with anxiety and tension associated with depression, offering a calming effect that supports patients during episodes of heightened discomfort.

Eligibility and Restrictions for Use

Official Eligibility for Biopin (Dosulepin Hydrochloride)

Biopin is typically approved for use in adults for the treatment of depressive illness. Official regulatory labeling often restricts use to those patients who have been intolerant of or unresponsive to alternative therapies, due to the drug's specific safety profile.

Populations Who Must Not Use Biopin (Contraindications)

Official regulatory labeling states that Biopin is strictly contraindicated in patients with certain severe pre-existing conditions or concurrent medication use:

Condition / Status Classification
Recent Myocardial Infarction Contraindicated
Cardiac Arrhythmias / Heart Block Contraindicated
Severe Liver Disease (Hepatic Failure) Contraindicated
Mania Contraindicated
Concurrent or Recent MAOIs Contraindicated

Age and Condition Restrictions

Use of this medicine is not recommended for children and adolescents under 18 years of age.

For older adults, use is permitted but requires close supervision and a lower starting dose due to increased risk of cardiovascular effects. Additionally, the medicine should be avoided during pregnancy and is not recommended while breastfeeding. Caution or avoidance is also advised for those with a history of epilepsy or conditions aggravated by anticholinergic effects, such as narrow-angle glaucoma and prostatic hypertrophy.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Biopin (Dosulepin Hydrochloride) has documented interactions based on its classification as a Tricyclic Antidepressant, necessitating specific prohibitions and cautions across its official regulatory profile.

Prohibited and Timing-Based Combinations

Classification Interacting Substance Constraint
Contraindicated Monoamine Oxidase Inhibitors (MAOIs) Must not be administered concurrently or within fourteen days of cessation of MAOI treatment.
Procedural Anaesthetics for Surgery The anaesthetist must be informed of Biopin treatment due to the increased risk of arrhythmias and hypotension.

Pharmacokinetic and Pharmacodynamic Interactions

Interactions that alter Biopin's exposure or potentiate its effects are officially documented. Selective Serotonin Reuptake Inhibitors (SSRIs) should be avoided as they may cause increases in Biopin's plasma levels. Other agents, including Methylphenidate, Phenothiazines, and Oral Contraceptives, may also increase serum concentration, while Barbiturates may cause a decrease.

Pharmacodynamic potentiation is noted for CNS Depressants (including alcohol and narcotic analgesics) and Sympathomimetics (e.g., Adrenaline), where co-administration enhances the central nervous depressant action or sympathomimetic effects. Conversely, the hypotensive effect of certain Antihypertensive Agents (e.g., Guanethidine) may be reduced.

Population-Specific Cautions

Caution is particularly necessary in the elderly population due to increased susceptibility to adverse reactions, and in patients with hepatic impairment, as toxic blood levels of Dosulepin may develop.

Mechanism of Action

Dual Central Monoamine Reuptake Inhibition

The mechanism of Biopin involves inhibition of both the Serotonin Transporter ( SERT) and the Norepinephrine Transporter ( NET). This molecular blockade prevents the rapid reabsorption of these key neurotransmitters, leading to sustained elevated concentrations in the synaptic cleft. The resulting chronic increase in signaling initiates a cascade of neuroplastic changes over time, which involves the modulation of central neurocircuitry function. The active metabolite, Northiaden, possesses a greater relative potency to NET inhibition, contributing to the dual SERT/ NET blockade.


Off-Target Antagonism and Acute Pathway Modulation

The molecule also binds to and blocks several other receptor types, including the Histamine H1 receptor and Muscarinic Acetylcholine receptors ( mAChR). Antagonism of the H1 receptor suppresses key arousal pathways, resulting in an acute physiological consequence: reduced histaminergic signaling in the CNS. Furthermore, Biopin interferes with the peripheral control of blood vessels via Alpha-1 (alpha1) Adrenergic receptor antagonism, leading to a reduction in systemic vascular tone.

Dosage and Administration Information

Instruction Map: How to Use Biopin — Official Administration Guidelines

Administration Scope

Feature Official Instruction or Rule
Route of Administration Oral administration only.
Dosing Schedule (Adults) The usual total daily dose ranges from 75 mg to 150 mg. Under certain circumstances, such as in hospital use, dosages up to 225 mg daily have been administered.
Timing in Relation to Meals The solid dose should be taken with a drink of water.
Preparation Requirements None. Tablets and capsules must be swallowed whole and should not be crushed or chewed.
Age-Group Administration Rules The initial dose for older adults is typically lower, starting at 50 mg to 75 mg daily. The medicine is not recommended for use in children or adolescents.
Special Procedural Conditions Treatment initiation for patients new to Dosulepin must be restricted to specialist care prescribers. The dose must be gradually withdrawn when treatment is concluded.

Instruction Classifications (High-Level)

  • Administration Method Type: Oral.
  • Frequency Pattern: Once daily (usually at night) or administered in divided doses three times daily.
  • Use-Context Constraints: Initiation and high-end maximum dosage are restricted to specialist care or hospital settings.

Resulting Procedural Structure

Official Step Sequence:

  • Treatment initiation must occur under the oversight of specialist care prescribers.
  • The dose starts low and is adjusted cautiously toward the maintenance range under supervision.
  • The daily total is taken either as divided doses or as a single dose administered at night.
  • The regimen is concluded by gradually withdrawing the dose over time.

Connection to the Overall Use Protocol

The official instructions establish a controlled use protocol focused on oral administration and supervised initiation. This structure dictates starting with a low dose and adjusting cautiously, while formalizing specific lower starting doses for the elderly population. The protocol requires the medicine to be swallowed whole and mandates that the dose be slowly tapered when the regimen is complete.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Research on Substance A in Musculoskeletal Conditions

Research has explored the relationship between the substance and joint function and pain levels. The focus of the research has been primarily on inflammation-related markers.


Joint Pain and Mobility Studies

  • Initial Research: Early studies examined measures of pain and stiffness in patients diagnosed with osteoarthritis. These investigations generally used a dosage range of 500 mg to 1,500 mg daily for periods up to 12 weeks.
  • Chronic Pain: Research has explored its role in chronic pain studies, focusing on individuals with non-specific musculoskeletal discomfort. Studies have evaluated time points for observed changes, with results reported across the first week of administration.
  • Swelling Metrics: Research evaluated whether changes in swelling were observed in affected joints during periods of high inflammation.

Research on Pharmacological Metrics

Research included laboratory assessments of inflammatory pathways. Studies examined factors that may affect the substance's presence in the body.

Absorption and Bioavailability Metrics

  • Combination with Compound B: The combination has been studied to measure changes in absorption and bioavailability. The study design included evaluation of administration with food to measure differences in absorption metrics.
  • Liposomal Formulations: Research measured the rate of absorption and overall systemic exposure in liposomal preparations.

Influence on Metrics of Inflammation

Research has included measurements of inflammation. Some studies reported specific observations in those whose joint pain was linked to certain biochemical markers. Studies investigated varying dose levels.

  • Comparative Research: Some studies have included comparisons with similar compounds to measure differences in key metrics.

Frequently Asked Questions (FAQ)

Common questions about Biopin (FAQ)


Q: What are the most common side effects people report with Biopin?

Official product information describes several common side effects. These may include general symptoms like drowsiness, dizziness, and headache. Other frequently reported effects involve the digestive system (constipation and nausea), as well as physical changes like dry mouth, blurred vision, sweating, and weight gain.


Q: Can I take pain relievers like ibuprofen while using Biopin?

The official regulatory profile for Biopin indicates a potential interaction with certain non-steroidal anti-inflammatory drugs (NSAIDs), such as acetylsalicylic acid. Using this type of pain reliever concurrently may increase the risk of gastrointestinal bleeding.


Q: Will Biopin affect my ability to drive or operate machinery?

Official product information states that Biopin may cause sedation and other central nervous system effects. Because of these effects, the drug may affect a person's ability to drive or operate machinery.


Q: Does Biopin interact with common over-the-counter allergy medications?

Regulatory authorities advise against using Biopin alongside other antihistamine medications. This combination may potentiate, or enhance, the drug's sedative effects and its anticholinergic effects, which can lead to dryness and blurred vision.


Q: How is Biopin different from older treatments for the same condition?

Official documentation classifies Biopin as a Tricyclic Antidepressant (TCA). It is recognized for its robust and relatively fast-acting sedative properties, a feature that may be useful for patients whose mood disorders are accompanied by significant anxiety or insomnia.


Q: Do I need a special diet while using Biopin?

Official regulatory documents do not specify a need for a special diet while taking this medicine. The drug is administered orally and should be swallowed whole with a drink of water.


Q: Can Biopin affect liver function?

Biopin is largely processed and cleared from the body by the liver. Due to this process, the medicine is contraindicated (should not be used) in patients with severe liver disease. Regulatory caution is generally advised for use in patients with hepatic impairment, as this condition may be associated with increased drug levels in the bloodstream.


Q: Is it okay to drink coffee while taking Biopin?

Official cautions are issued against taking Biopin with sympathomimetics, which are substances that mimic the effects of adrenaline and noradrenaline. This combination may increase the risk of hypertension (high blood pressure).


Q: Does Biopin work better for certain groups of people?

Official guidance does not provide comparative data on whether the drug is more effective for certain population groups. However, a lower initial dose is mandated for older adults due to their increased sensitivity to adverse reactions, such as postural hypotension.


Q: Is it safe to take Biopin if I have a heart condition?

Biopin is contraindicated for patients who have had a recent heart attack, cardiac arrhythmias, or heart block. Caution is required when the drug is used in patients with any suspected cardiovascular disease, as the drug may increase the risk of certain cardiac issues.


Q: Why is Biopin's mechanism of action relevant to its use?

The relevance of the drug's action comes from its core function as a non-selective inhibitor of key chemical messengers, Serotonin and Norepinephrine. By blocking the reabsorption of these substances in the brain, it is associated with neuroplastic changes which are believed to contribute to mood elevation and emotional stability.


Q: How quickly should I expect Biopin to start working?

As with many antidepressant medications, the clinical or therapeutic effects typically take time to fully develop and become apparent. Official guidance indicates that close monitoring is standard during the initial few months of therapy for changes in symptoms and behavior.


Q: Is Biopin taken for acute issues or long-term management?

Regulatory documents support the use of antidepressants in this class for the management of depressive illness, including long-term use. The goal of continuous therapy is often to help delay the recurrence of depressive episodes.


Q: Can Biopin cause trouble sleeping?

While Biopin is generally noted for having sedative properties, patients who stop taking the medicine suddenly may experience certain withdrawal symptoms. Official documents indicate that insomnia (trouble sleeping) can be a part of the reported withdrawal effects.


Q: Does Biopin have a 'black box' warning mentioned by the FDA?

Tricyclic antidepressants, the class to which this medicine belongs, are generally associated with a specific regulatory boxed warning in the United States. The warning outlines the risk of increased suicidal thinking and behavior associated with the initiation of treatment in children, adolescents, and young adults.


Q: Is Biopin generally considered safe for people over 65?

Use of this medicine is permitted in the elderly population, but official documents require close supervision and a lower starting dose. Older adults are particularly susceptible to certain adverse reactions, such as confusion, agitation, and postural hypotension (dizziness upon standing).


Q: Is it normal to feel slightly nauseous after starting Biopin?

According to official drug documents, nausea is listed as a commonly reported adverse reaction. Patients who experience this may report it as feeling slightly sick to their stomach.


Q: Is there any research on Biopin's long-term effects?

Clinical data and maintenance trials for the Tricyclic Antidepressant class, which Biopin belongs to, support its use over longer periods to delay the recurrence of depression. This type of use is subject to ongoing review and monitoring.


Q: How long does Biopin stay in your system?

Pharmacokinetic studies indicate that the elimination half-life for the active substance is approximately 20.4 hours after a single oral dose. This is the time it takes for the concentration of the medicine in the body to be reduced by half.


Q: What research evidence supports the use of Biopin?

The use of Biopin is supported by its official indication for the treatment of depressive illness. It is recognized by major official health bodies for its role in the management of mood disturbances.


Q: What are the common reasons a doctor might prescribe Biopin?

The drug is officially indicated for the treatment of depressive illness. It is often prescribed when an anti-anxiety or sedative effect is also needed, as this is a known property of the medication.


Q: Does Biopin cause any changes in mood or anxiety levels?

Official documents state that the drug is associated with mood and mental changes. Close monitoring for symptoms such as agitation, irritability, or increased suicidal thoughts is recommended, particularly when treatment is first started.


Q: Can Biopin interact with vitamins or supplements like St. John's Wort?

Official warnings note a caution regarding the co-administration of Biopin with herbal supplements such as St. John's Wort. Using these substances together may increase the risk of a serious condition called serotonin syndrome, which is related to excessive nerve activity.


Q: Is Biopin safe for people who have kidney issues?

Caution is advised in patients who have severe renal disease (kidney issues). Because the drug is predominantly cleared by the kidneys, slower elimination can occur, potentially leading to toxic levels of the drug in the system.


Q: Why is Biopin sometimes prescribed instead of other drugs?

Official regulatory documents state that the medicine is reserved for use in patients who have been intolerant of or unresponsive to alternative treatment options. This is due to its specific safety profile and considerations around use.


Q: Are there any severe or rare side effects of Biopin I should be aware of?

Clinically significant adverse reactions are described in official documents and require careful monitoring. These potential serious effects include cardiac arrhythmias (irregular heartbeat), seizures, and increased suicidal thoughts.


Q: Does Biopin affect blood pressure readings?

Official documents note that the drug can interfere with the peripheral control of blood vessels. This effect can lead to a reduction in systemic vascular tone, potentially causing a drop in blood pressure, known as postural hypotension (feeling dizzy when standing).


Q: What studies have been done on Biopin in children?

The use of this medicine is not recommended for children or adolescents due to a lack of clinical experience in the pediatric population. Furthermore, the drug class is associated with a potential increased risk of suicidal thoughts in younger individuals.


Q: Does using Biopin require any routine blood tests?

Regular blood tests may be needed while using the drug. These tests may be utilized to check for unwanted effects and to monitor patient progress at regular visits.


Q: How soon after stopping Biopin do the effects wear off?

Pharmacokinetic data provides information on how long the drug remains in the body. The elimination half-life for the active substance is approximately 20.4 hours after a single dose.


Q: Can Biopin cause weight changes?

According to the official regulatory adverse effect profile, weight gain is listed as a commonly reported side effect associated with the use of the drug.


Q: What is the typical duration of treatment with Biopin?

The drug is used in the treatment of depressive illness. Clinical guidance supports that the drug is often prescribed for long-term use to help delay the recurrence of depressive episodes.


Q: Has Biopin been approved in other countries besides the US?

The active ingredient in Biopin is recognized and used for therapeutic purposes outside of the United States. Official regulatory bodies in several European and South Asian countries, as well as Australia and New Zealand, have approved its use.


Q: What is the main concern doctors have when prescribing Biopin?

A primary concern documented by regulatory authorities is the drug's relatively low margin of safety. It is noted that the drug has high toxicity in cases of overdose, with severe effects occurring rapidly.


Q: Does Biopin affect blood sugar levels?

While not listed as a common effect in all official documents, regulatory caution is generally advised for use in patients who have pre-existing conditions such as diabetes.

How should Biopin be stored and disposed of?

How to Store and Dispose of Biopin (Dosulepin Hydrochloride)

Biopin tablets must be stored according to regulatory requirements to ensure stability and safety. The product should be stored at or below 25 C or 30 C (depending on the product license) and protected from heat, moisture, and direct sunlight. Always keep the medication in its original, tightly closed container until use.

Crucially, this medication must be stored securely out of the sight and reach of children due to the high toxicity risk of accidental overdose. For disposal, unused or expired tablets must not be flushed down the toilet or poured down the drain. Instead, utilize drug take-back programs or seal the product in a bag mixed with an undesirable substance (e.g., used coffee grounds) before discarding in the household trash.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

Available in countries:

Equivalent of Biopin found in:

A-Z Index: