Clomipramine

What Is Clomipramine and What Is It Used For?

Quick Answer: Clomipramine is a tricyclic antidepressant (TCA) that works by increasing serotonin and norepinephrine levels in the brain. It is primarily prescribed for obsessive-compulsive disorder (OCD), depression, panic disorder, phobic anxiety, and narcolepsy.

Clomipramine belongs to the dibenzazepine subgroup of tricyclic antidepressants. Its primary mechanism of action involves potent inhibition of serotonin (5-HT) reuptake at the synaptic cleft, with its active metabolite desmethylclomipramine additionally inhibiting norepinephrine reuptake. This dual mechanism distinguishes clomipramine from most other TCAs and contributes to its particularly strong efficacy in treating OCD, a condition closely linked to serotonergic dysfunction.

Clomipramine is included in the World Health Organization (WHO) Model List of Essential Medicines, reflecting its global importance in treating psychiatric disorders. It has been used clinically since the 1960s and remains a cornerstone of OCD pharmacotherapy, particularly in cases where selective serotonin reuptake inhibitors (SSRIs) have proven insufficient.

Approved Indications

Clomipramine is prescribed for several psychiatric and neurological conditions:

• Obsessive-compulsive disorder (OCD) – Clomipramine is regarded as one of the most effective medications for OCD. Multiple meta-analyses, including Cochrane reviews, have demonstrated its superiority over placebo and comparable or slightly superior efficacy to SSRIs for this indication. It reduces intrusive thoughts (obsessions) and repetitive behaviors (compulsions).
• Major depressive disorder – As a tricyclic antidepressant, clomipramine has well-established antidepressant properties. It is typically reserved for moderate-to-severe depression or when newer antidepressants have not provided adequate relief.
• Panic disorder – Effective in reducing the frequency and severity of panic attacks, including panic disorder with or without agoraphobia (fear of open or crowded spaces).
• Phobic anxiety disorders – Used in the treatment of specific phobias and social anxiety when these conditions significantly impair daily functioning.
• Narcolepsy – Clomipramine helps manage cataplexy (sudden muscle weakness triggered by emotions) and other symptoms of narcolepsy, a neurological condition characterized by sudden, uncontrollable sleep episodes.

While these are the principal approved indications, clinicians may sometimes prescribe clomipramine off-label for conditions such as chronic pain syndromes, premature ejaculation, or enuresis (bedwetting) in children, where evidence supports potential benefit. Any off-label use should be carefully discussed with the prescribing physician.

What Should You Know Before Taking Clomipramine?

Quick Answer: Clomipramine must not be taken with MAO inhibitors or immediately after a heart attack. Before starting treatment, inform your doctor about any history of epilepsy, heart problems, glaucoma, liver or kidney disease, thyroid disorders, or prostate enlargement.

Contraindications

Clomipramine must not be taken in the following circumstances:

• Hypersensitivity to clomipramine, any other tricyclic antidepressant of the dibenzazepine group, or any of the excipients in the formulation.
• Concurrent use of MAO inhibitors – Taking clomipramine together with monoamine oxidase inhibitors (MAOIs), including moclobemide, is strictly contraindicated due to the risk of fatal serotonin syndrome. A washout period of at least 14 days is required when switching between these drug classes.
• Concurrent use of SSRIs or SNRIs – Combining clomipramine with selective serotonin reuptake inhibitors (e.g., fluoxetine, paroxetine, fluvoxamine) or serotonin-norepinephrine reuptake inhibitors (e.g., venlafaxine) is contraindicated for the same reason.
• Recent myocardial infarction – Clomipramine is contraindicated in patients who have recently had a heart attack due to its cardiovascular effects, including potential arrhythmias and conduction disturbances.

Warnings and Precautions

Before starting clomipramine, it is essential to discuss the following conditions and risk factors with your prescribing physician:

• Epilepsy or seizure history – Clomipramine can lower the seizure threshold. Patients with a history of seizures require careful monitoring and possible dose adjustments.
• Cardiac arrhythmias or conduction disorders – The drug can affect cardiac conduction and may cause or worsen arrhythmias. An ECG may be recommended before and during treatment, especially in elderly patients.
• Glaucoma (narrow-angle) – Clomipramine has anticholinergic properties that can increase intraocular pressure, potentially worsening glaucoma.
• Liver or kidney disease – Impaired hepatic or renal function may alter drug metabolism and require dose adjustments.
• Urinary retention or prostatic enlargement – The anticholinergic effects can exacerbate difficulty urinating.
• Hyperthyroidism – Overactive thyroid increases sensitivity to the cardiovascular effects of tricyclic antidepressants.
• Schizophrenia or other psychotic disorders – Clomipramine may exacerbate psychotic symptoms in vulnerable patients.
• Pheochromocytoma – This adrenal gland tumor creates a risk of hypertensive crisis when combined with tricyclic antidepressants.
• Heavy alcohol use – Alcohol can potentiate the sedative effects of clomipramine and increase the risk of seizures.
• Bleeding tendency – Clomipramine can affect platelet function and may increase the risk of bleeding, particularly when combined with anticoagulants, aspirin, or NSAIDs.

Regular monitoring by your doctor is important during clomipramine therapy. This may include blood tests, blood pressure measurements, and cardiac function assessments to ensure the dose remains appropriate and that side effects are minimized. Before any surgery or dental procedure, inform the treating physician or dentist that you are taking clomipramine.

Clomipramine can increase photosensitivity. Avoid prolonged direct sun exposure, protect your skin with clothing, and use sunglasses during treatment. As with all antidepressants in this class, clomipramine does not provide immediate symptom relief. Therapeutic effects typically develop over several weeks. It is critical to continue treatment as prescribed even if initial improvement seems slow.

Children and Adolescents

Clomipramine should not be used for treating depression in children and adolescents under 18 years of age. Studies of antidepressant medications in this age group have shown an increased risk of suicidal behavior, self-harm, and hostility. However, a physician may prescribe clomipramine to patients under 18 for OCD if the potential benefits clearly outweigh the risks, as it is one of the few medications with established efficacy for childhood OCD. The long-term effects on growth, maturation, cognitive development, and behavioral development in this population have not been fully established.

Elderly Patients

Older adults generally require lower doses of clomipramine than younger patients. The dose should be initiated at the lowest effective level and increased cautiously. Elderly patients are more susceptible to the anticholinergic, cardiovascular, and sedative effects of the drug. Particular attention should be paid to orthostatic hypotension (dizziness when standing up), which increases the risk of falls in this population.

Pregnancy and Breastfeeding

Clomipramine crosses the placental barrier and may affect fetal development. The active substance also passes into breast milk. Women who are pregnant, planning pregnancy, or breastfeeding should always consult their doctor before starting or continuing treatment. The decision to use clomipramine during pregnancy should weigh the benefits of treating the mother's condition against the potential risks to the fetus. In some cases, the untreated psychiatric condition itself may pose greater risks to both mother and child than the medication.

Driving and Operating Machinery

Clomipramine can cause drowsiness, reduced alertness, and blurred vision, particularly during the initial phase of treatment or after dose adjustments. Patients experiencing these effects should not drive, operate heavy machinery, or perform tasks requiring heightened attention. These effects often diminish as the body adjusts to the medication, but patients should exercise caution and follow their physician's guidance on resuming these activities.

How Does Clomipramine Interact with Other Drugs?

Quick Answer: Clomipramine has significant interactions with MAO inhibitors, SSRIs, SNRIs, antiepileptics, antipsychotics, anticoagulants, and several other medications. Always inform your doctor about all medications you take, including over-the-counter drugs and herbal supplements.

Drug interactions are a major safety consideration with clomipramine. Because it affects multiple neurotransmitter systems and is metabolized by cytochrome P450 liver enzymes, it can interact with a wide range of medications. Some interactions can be life-threatening. Always provide your prescribing physician and pharmacist with a complete list of all medications, supplements, and herbal products you are currently taking.

Major Interactions (Avoid Combination)

Moderate Interactions (Use with Caution)

Clomipramine can be taken with or without food. However, taking it with a meal may help reduce gastrointestinal side effects such as nausea. Consistent timing of doses relative to meals is recommended for stable blood levels.

What Is the Correct Dosage of Clomipramine?

Quick Answer: The effective maintenance dose for most adults is 25–150 mg per day. Treatment is started at a low dose and gradually increased. Your doctor will determine the appropriate dose based on your condition, age, and response to therapy.

Clomipramine dosing is highly individualized. The appropriate dose depends on the patient's age, the specific condition being treated, disease severity, and individual tolerance. Treatment always begins with a low starting dose that is gradually increased to minimize side effects and allow the body to adjust. Similarly, when discontinuing treatment, the dose should be tapered slowly to avoid withdrawal symptoms.

Adults

For OCD specifically, higher doses within the therapeutic range (100–250 mg/day) are often required for adequate symptom control. The APA practice guidelines recommend maintaining the effective dose for at least 1–2 years before considering gradual discontinuation, as OCD tends to be a chronic condition with high relapse rates.

Children and Adolescents

Elderly Patients

Missed Dose

If you forget to take a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for the one you missed. If you have any concerns, contact your doctor or pharmacist for guidance.

Overdose

Tricyclic antidepressant overdoses are among the most dangerous prescription drug overdoses. Even moderate overdoses can be life-threatening due to the cardiac toxicity of these medications. Patients who accidentally or intentionally take more than the prescribed amount should seek emergency medical attention without delay.

Discontinuing Treatment

Clomipramine should never be stopped abruptly. The dose must be reduced gradually over several weeks under medical supervision. Sudden discontinuation can cause a withdrawal syndrome with symptoms including:

• Nausea and vomiting
• Gastrointestinal disturbances (diarrhea, abdominal cramps)
• Tremor and dizziness
• Excessive sweating
• Sleep disturbances (insomnia, vivid dreams)
• Irritability and anxiety
• General malaise and flu-like symptoms

Your physician will create a tapering schedule tailored to your individual needs, typically reducing the dose by small increments every 1–2 weeks. If withdrawal symptoms occur despite gradual tapering, the dose may be temporarily increased before continuing the taper more slowly.

How to Take Clomipramine

Standard (coated) tablets should be swallowed whole with plenty of water. The extended-release (Retard) tablets can be swallowed whole or divided along the score line but must not be crushed or chewed, as this would destroy the controlled-release mechanism and potentially cause a rapid release of the entire dose. Clomipramine may be taken with or without food.

What Are the Side Effects of Clomipramine?

Quick Answer: The most common side effects include dry mouth, constipation, dizziness, drowsiness, tremor, blurred vision, nausea, weight gain, and sweating. Most side effects are dose-dependent and tend to diminish over time as the body adjusts to the medication.

Like all medications, clomipramine can cause side effects, although not everyone experiences them. Side effects are generally most pronounced during the initial weeks of treatment and often subside as the body adapts. Many side effects are related to the drug's anticholinergic, antihistaminic, and adrenergic blocking properties. Your doctor has determined that the benefits of treatment outweigh the potential risks for your specific condition.

An increased risk of bone fractures has been observed in patients taking this type of medication. If you experience any side effects that concern you, or if existing side effects worsen, consult your doctor or pharmacist promptly. Most side effects do not require specific medical treatment and resolve as the body adjusts to the medication.

How Should You Store Clomipramine?

Quick Answer: Store clomipramine out of reach of children. Tablets have no special storage requirements; 25 mg tablets should be kept in their original packaging as they are moisture-sensitive. Do not use after the expiry date.

Proper storage of medications is essential to maintain their efficacy and safety. Clomipramine should always be kept out of the sight and reach of children to prevent accidental ingestion, which can be extremely dangerous given the toxicity of tricyclic antidepressants in overdose.

• 10 mg tablets and 75 mg extended-release tablets: No special storage requirements.
• 25 mg tablets: Store in the original packaging to protect from moisture.
• Do not use after the expiry date printed on the carton. The expiry date refers to the last day of the indicated month.
• Do not dispose of medications via the drain or household waste. Return unused or expired medications to your pharmacy for safe disposal to protect the environment.

If you notice any visible changes in the appearance of the tablets, such as discoloration, unusual odor, or crumbling, do not use them and consult your pharmacist.

What Does Clomipramine Contain?

Quick Answer: The active substance is clomipramine hydrochloride. Inactive ingredients vary by formulation and include lactose monohydrate, sucrose, magnesium stearate, corn starch, and various coating agents.

Understanding the composition of your medication is important, particularly if you have known allergies or intolerances to certain excipients.

Active Ingredient

The active pharmaceutical ingredient in all formulations is clomipramine hydrochloride, available in strengths of 10 mg, 25 mg (coated tablets) and 75 mg (extended-release tablets).

Inactive Ingredients (Excipients)

Tablet Appearance

• 10 mg coated tablet: Pale yellow, triangular, biconvex. Dimensions approximately 5.8 mm high, 3.3 mm thick.
• 25 mg coated tablet: Pale yellow, round, biconvex. Diameter approximately 5.5 mm.
• 75 mg extended-release tablet: Pink, oblong with a score line, marked "CG" and "GD".

Available pack sizes include 20, 30, and 100 tablets depending on the strength and formulation. Not all pack sizes may be available in every market.