Anafranil Drug Interactions: What You Need to Know

Anafranil (Clomipramine) is a powerful medication for OCD, but it interacts with a long list of other drugs, supplements, and even certain foods. Some of these interactions can be dangerous — even life-threatening.

This guide covers the most important interactions to be aware of so you can stay safe while taking Anafranil.

How Drug Interactions Work

Drug interactions happen when one substance changes how another works in your body. With Anafranil, interactions typically fall into three categories:

1. Increased Anafranil levels — Some drugs slow down the enzymes that break down Clomipramine in your liver (CYP2D6 and CYP1A2), causing it to build up to potentially toxic levels.
2. Serotonin overload — Combining Anafranil with other serotonin-boosting drugs can cause serotonin syndrome, a potentially fatal condition.
3. Additive side effects — Some combinations amplify side effects like sedation, low blood pressure, or heart rhythm changes.

Medications That Interact with Anafranil

Dangerous Interactions (Contraindicated)

These combinations should never be used together:

• MAOIs (monoamine oxidase inhibitors) — Including Phenelzine (Nardil), Tranylcypromine (Parnate), Isocarboxazid (Marplan), and Selegiline (Emsam). This combination can cause seizures, extremely high fever, coma, and death. You must wait at least 14 days between stopping an MAOI and starting Anafranil, and vice versa.
• Linezolid (Zyvox) — An antibiotic that also has MAOI activity. Risk of serotonin syndrome.
• Intravenous Methylene Blue — Used in certain medical procedures. Also has MAOI activity and can trigger serotonin syndrome.

Major Interactions (Use with Extreme Caution)

• SSRIs — Fluoxetine (Prozac) and Paroxetine (Paxil) are particularly risky because they're both serotonergic AND they inhibit CYP2D6, the enzyme that breaks down Clomipramine. This double effect can dramatically increase Anafranil levels while also raising serotonin syndrome risk. Fluvoxamine (Luvox) inhibits CYP1A2, causing similar problems. Sertraline (Zoloft) and other SSRIs also carry serotonin syndrome risk.
• Other serotonergic drugs — Venlafaxine (Effexor), Duloxetine (Cymbalta), Triptans (Sumatriptan/Imitrex, etc.), Tramadol, Fentanyl, Lithium, Buspirone (Buspar), and Tryptophan supplements.
• CYP2D6 inhibitors — Quinidine, Bupropion (Wellbutrin), Terbinafine (Lamisil) — These slow down Clomipramine metabolism and can raise blood levels dangerously.
• CYP1A2 inhibitors — Fluvoxamine (Luvox), Ciprofloxacin (Cipro) — Same issue: slowed metabolism means higher, potentially toxic Anafranil levels.
• Drugs that prolong the QT interval — Many medications can affect heart rhythm, and combining them with Anafranil increases the risk of dangerous arrhythmias. Examples include certain antipsychotics (Haloperidol, Ziprasidone), antibiotics (Azithromycin, Erythromycin, Moxifloxacin), and antiarrhythmics (Amiodarone, Sotalol).

Moderate Interactions (Monitor Closely)

• Anticholinergic drugs — Including Benztropine (Cogentin), Oxybutynin (Ditropan), Diphenhydramine (Benadryl). These can amplify Anafranil's anticholinergic side effects: dry mouth, constipation, urinary retention, blurred vision, and confusion (especially in elderly patients).
• Sympathomimetics — Stimulant medications like Methylphenidate (Ritalin) and Amphetamine (Adderall) may increase blood pressure and heart rate when combined with Anafranil.
• Warfarin and other anticoagulants — Anafranil may increase the blood-thinning effect of Warfarin (Coumadin), raising the risk of bleeding. Your doctor may need to monitor your INR more frequently.
• Alcohol and CNS depressants — Benzodiazepines (Alprazolam/Xanax, Clonazepam/Klonopin), sleep medications (Zolpidem/Ambien), opioids, and alcohol all enhance Anafranil's sedative effects and may lower the seizure threshold.

Supplements and OTC Medications to Watch

Don't assume that "natural" means safe with Anafranil:

• St. John's Wort — Boosts serotonin and can cause serotonin syndrome when combined with Anafranil. Do not use together.
• Tryptophan / 5-HTP supplements — Serotonin precursors that increase the risk of serotonin syndrome.
• Diphenhydramine (Benadryl) — Adds anticholinergic effects. May worsen dry mouth, constipation, and urinary retention.
• Pseudoephedrine (Sudafed) — A sympathomimetic that may increase blood pressure and heart rate.
• Melatonin — Generally considered safe with Anafranil, but may increase drowsiness. Discuss with your doctor.
• Fish oil / Omega-3s — Generally safe but may have a mild blood-thinning effect.

Food and Drink Interactions

• Alcohol — Significantly enhances sedation and may lower the seizure threshold. Most doctors recommend avoiding alcohol entirely or limiting it substantially while taking Anafranil.
• Grapefruit juice — May increase Clomipramine levels by inhibiting liver enzymes. While the effect is less pronounced than with some other medications, it's worth mentioning to your doctor if you regularly drink grapefruit juice.
• Caffeine — Generally safe in moderate amounts, but excessive caffeine may increase anxiety and counteract Anafranil's calming effects.

What to Tell Your Doctor

Before starting Anafranil, make sure your doctor has a complete picture:

• All prescription medications you take — including those prescribed by other doctors
• All over-the-counter medications — including pain relievers, allergy medications, and sleep aids
• All supplements and vitamins — including herbal products like St. John's Wort
• Recreational substances — including alcohol, marijuana, and any other drugs
• Recent medication changes — particularly if you've recently stopped an MAOI or SSRI
• Any planned surgeries or procedures — Anafranil may need to be adjusted before anesthesia

If another doctor prescribes you a new medication while you're on Anafranil, always mention that you take Clomipramine. Pharmacists are also an excellent resource — they can check for interactions before you fill a new prescription.

Signs of a Dangerous Interaction

Seek emergency medical attention if you experience:

• Serotonin syndrome symptoms: agitation, confusion, rapid heart rate, high blood pressure, dilated pupils, muscle twitching or rigidity, high fever, sweating, diarrhea
• Cardiac symptoms: rapid or irregular heartbeat, fainting, chest pain
• Seizures
• Severe drowsiness or difficulty breathing

For more on serious side effects, see our guide on Anafranil side effects.

Final Thoughts

Anafranil is an effective medication, but its interaction profile demands respect. The most critical rule: never combine Anafranil with MAOIs, and be very cautious with SSRIs and other serotonergic drugs. Always keep your doctors and pharmacists informed about everything you take.

If you're taking Anafranil and need help finding it in stock, Medfinder can help you locate a pharmacy near you with availability.