Anafranil (Clomipramine) Side Effects & Withdrawal Symptoms
Table of Contents
Most Anafranil side effects are common, dose-related, and tend to ease as your body adjusts. Anafranil (clomipramine) is a tricyclic antidepressant approved for obsessive-compulsive disorder (OCD), and at the doses used in trials it produced dry mouth in up to 84% of adults, along with drowsiness, dizziness, and constipation. A smaller set of effects is serious: seizures, heart-rhythm changes, a boxed warning for suicidal thoughts in younger patients, and withdrawal symptoms if the medication is stopped too fast.
Key Takeaways
- Common effects are frequent but usually manageable. The FDA label reports dry mouth (84%), drowsiness (54%), dizziness (54%), and constipation (47%) in adults taking Anafranil for OCD.
- Sexual side effects are common in men. Roughly 42% reported ejaculation problems and 20% reported impotence in clinical trials.
- Seizures are the most significant risk. The FDA flags them as dose-related, and clomipramine carries a boxed warning for suicidal thoughts in people under 25.
- Anafranil isn't addictive, but it can cause withdrawal. Stopping suddenly may bring on dizziness, nausea, and irritability, so doctors taper the dose.
What Is Anafranil (Clomipramine)?
Anafranil is the brand name for clomipramine, a tricyclic antidepressant (TCA) approved by the FDA to treat obsessions and compulsions in people with OCD. It works mainly by blocking the reuptake of serotonin in the brain, which is thought to drive its effect on obsessive and compulsive symptoms.
It’s approved for adults and for children as young as 10. Most side effects are tied to the dose, so prescribers usually start low and raise it slowly, which gives the body time to adjust and helps blunt early nausea and dizziness. Clomipramine for OCD often takes longer to work than people expect, since serotonin reuptake inhibitors may need 8 to 12 weeks to show a clear benefit.
Common Side Effects of Anafranil
The most common Anafranil side effects involve the mouth and gut, the nervous system, and overall energy. In the pooled OCD trials, dry mouth was the single most reported effect, followed by drowsiness, dizziness, tremor, and constipation. Most are bothersome rather than dangerous, and many ease over the first few weeks.
Grouped by body system, the clomipramine side effects reported at the highest rates were:
- Digestive: dry mouth, constipation, nausea, indigestion, and reduced appetite.
- Nervous system: drowsiness, dizziness, tremor, headache, and trouble sleeping.
- Energy and metabolic: fatigue, weight gain, and increased appetite.
- Skin and temperature: increased sweating and heightened sun sensitivity.
| Side Effect | Reported in Adults | On Placebo |
|---|---|---|
| Dry mouth | 84% | 17% |
| Drowsiness | 54% | 16% |
| Dizziness | 54% | 14% |
| Tremor | 54% | 2% |
| Constipation | 47% | 11% |
| Fatigue | 39% | 18% |
| Nausea | 33% | 14% |
| Increased sweating | 29% | 3% |
| Weight gain | 18% | 1% |
Figures come from the prescribing information, drawn from placebo-controlled OCD trials in 322 adults. Real-world rates vary. Children and adolescents showed a similar pattern, with dry mouth, drowsiness, and tremor among the most frequent.
Serious Side Effects and When to Seek Emergency Care
A small number of Anafranil side effects are serious and need fast medical attention. Seizures are the drug’s most significant risk, with a dose-related cumulative incidence of about 0.6% by 90 days and 1.45% by one year in trials, and other serious effects include heart-rhythm changes, low blood sodium (hyponatremia, often from SIADH), and rare blood or liver problems.
Get medical help right away for any of these warning signs:
- Fainting, chest pain, or a fast or irregular heartbeat.
- A seizure or convulsion.
- Headache, confusion, weakness, or unsteadiness that could signal low sodium.
- Fever with a sore throat or other signs of infection.
- Rash with fever and swollen glands, or swelling of the face, lips, or throat.
Clomipramine can also trigger or unmask psychotic symptoms in some people, including confusion, hallucinations, or paranoia, which is another reason to keep prescribers in the loop during dose changes.
Boxed Warning: Suicidal Thoughts and Behavior
Clomipramine carries an FDA boxed warning, the agency’s strongest, for an increased risk of suicidal thinking and behavior in children, adolescents, and young adults up to age 24. The risk didn’t increase in adults beyond age 24, and was lower in adults 65 and older, and the danger runs highest early in treatment and right after any dose change.
Families and caregivers play a real role here. Watch for new or worsening agitation, irritability, panic, insomnia, aggression, impulsiveness, or sudden mood and behavior changes, and report these to the prescriber quickly. OCD and depression themselves raise suicide risk, so close monitoring protects the patient regardless of the cause.
Serotonin Syndrome
Serotonin syndrome is a rare but potentially life-threatening reaction that can happen when clomipramine raises serotonin too high, especially alongside other serotonergic drugs. Triggers include triptans, fentanyl, lithium, tramadol, tryptophan, buspirone, St. John’s wort, and monoamine oxidase inhibitors (MAOIs).
Symptoms can come on fast: agitation, hallucinations, fast or irregular heartbeat, fever, heavy sweating, tremor, muscle stiffness or twitching, loss of coordination, nausea, vomiting, and diarrhea. This is a medical emergency. The drug and any other serotonergic medication should be stopped and treated at once.
DRESS and Severe Allergic Reactions
Rare cases of DRESS (drug reaction with eosinophilia and systemic symptoms) have been reported with clomipramine. DRESS is a multi-organ hypersensitivity reaction that can involve the liver, kidneys, or heart, and it can be fatal if missed, so clomipramine should be stopped immediately if DRESS is suspected.
Warning signs include fever, swollen lymph glands, facial swelling, and yellowing of the skin or eyes. A spreading rash paired with fever and swollen glands is a red-flag combination that warrants urgent evaluation.
Sexual Side Effects
Sexual side effects are among the more common reasons people consider switching off Anafranil, and they’re well documented in men. In premarketing trials, about 42% of men with OCD reported ejaculation failure and 20% reported impotence, compared with roughly 2% to 3% on placebo, and changed libido showed up in about 21% of adults overall.
These effects are usually dose-related, and many improve with a dose adjustment or a switch to a different medication. About 85% of men who had sexual dysfunction in trials chose to keep taking the drug, a sign that for many the OCD benefit outweighed the effect. Whether sexual side effects ease often depends on the dose, so this is worth raising with a prescriber rather than stopping on your own.
Drug Interactions That Worsen Side Effects (MAOIs, Alcohol)
Some combinations turn manageable side effects into emergencies, and the most important rule involves MAOIs. Clomipramine is contraindicated with an MAOI used for psychiatric conditions, with a 14-day gap required in either direction: 14 days after stopping an MAOI before starting Anafranil, and 14 days after stopping Anafranil before starting an MAOI, because the mix raises the risk of serotonin syndrome. The same caution applies to linezolid and intravenous methylene blue, which also act like MAOIs.
Other interactions worth knowing:
- Alcohol and other CNS depressants add to clomipramine’s sedation and dizziness, so caution is advised with other drugs that act on the brain.
- Other serotonergic drugs (triptans, tramadol, fentanyl, lithium, buspirone, tryptophan, St. John’s wort) raise the serotonin syndrome risk.
- Highly protein-bound drugs such as warfarin and digoxin can shift in blood level alongside clomipramine, which is itself highly protein-bound.
- Enzyme-affecting drugs such as cimetidine, fluoxetine, and fluvoxamine can raise clomipramine blood levels and sharpen its side effects.
Tell every prescriber and pharmacist about all medications and supplements you take, including over-the-counter products, so interactions get caught before they cause harm.
Worried about side effects, drug mixing, or stopping safely? Reach Recovere can help you find care that fits and sort out how to pay for it.
Find Treatment OptionsAnafranil Overdose Risks
An Anafranil overdose is a medical emergency, and tricyclic antidepressants are among the more dangerous medications in overdose. The prescribing information states plainly that deaths can occur, that overdose often involves more than one substance including alcohol, and that 2 of 12 reported acute overdoses with Anafranil in US trials were fatal.
The most dangerous effects are cardiac. Toxicity brings heart-rhythm disturbances, severe low blood pressure, seizures, and CNS depression including coma, with widening of the QRS complex on an ECG as a key marker. Risk climbs when clomipramine is combined with alcohol or other depressants, which is one reason co-occurring substance use deserves attention in anyone taking a TCA. Signs of toxicity appear quickly, so anyone who may have taken too much needs emergency medical care without delay.
Long-Term Effects and How Long Side Effects Last
Many early Anafranil side effects fade within the first few weeks, while a few can persist. Nausea, dizziness, and drowsiness often settle as the body adapts to a steady dose. Weight gain and sexual side effects are more likely to stick around, and they may need a dose change or a different medication to resolve.
Timing cuts two ways here. The bothersome side effects tend to show up first, often before the OCD benefit does, because the therapeutic effect of clomipramine can take 8 to 12 weeks to become clear, and responses vary from person to person without a clear pattern of irreversible effects from normal use. If a side effect is severe or isn’t improving after several weeks, that’s a conversation to have with the prescriber rather than a reason to quit cold.
Anafranil Withdrawal and Discontinuation Symptoms
Anafranil isn’t addictive the way opioids or stimulants are, but stopping it abruptly can cause withdrawal—and that distinction trips up a lot of people, because withdrawal symptoms don’t mean the medication was addictive—so the two ideas need to stay separate. Clomipramine hasn’t been systematically studied for abuse or dependence, and no pattern of drug-seeking behavior turned up. What it can cause is a discontinuation syndrome: a cluster of physical symptoms when the medication leaves the body too fast.
Withdrawal symptoms include dizziness, nausea, vomiting, headache, malaise, sleep disturbance, fever, and irritability. People may also notice their original OCD or mood symptoms returning, which is a return of the underlying condition rather than withdrawal itself. The guidance is direct: taper the dose gradually and monitor closely during discontinuation.
Withdrawal Symptom Timeline
Discontinuation symptoms usually start within a few days of an abrupt stop or a big dose cut. Most are mild to moderate and ease over one to two weeks, though the exact arc depends on the dose, how long someone took the drug, and individual factors. There’s no official hour-by-hour schedule for clomipramine withdrawal, so treat any timeline as a general pattern rather than a guarantee.
A common pattern looks like this:
- Days 1 to 3: dizziness, nausea, headache, and irritability may appear first.
- Days 4 to 7: physical symptoms often intensify before they level off.
- Week 1 to 2: symptoms tend to peak, then gradually fade.
- Beyond two weeks: most discontinuation symptoms resolve, though some people taper over a longer stretch.
How to Safely Stop (Tapering)
The safe way to stop Anafranil is a slow, doctor-supervised taper, never an abrupt halt. A gradual taper, paired with watching for both withdrawal and any return of psychiatric symptoms, steps the dose down in stages over weeks and gives the brain time to adjust at each level.
Stopping on your own raises the odds of uncomfortable withdrawal and a sudden relapse of OCD or depression. A prescriber can map a schedule to your dose and history, slow it down if symptoms flare, and adjust care if the underlying condition resurfaces.
Special Populations (Pregnancy, Older Adults, Children)
Side-effect risks shift for some groups, so clomipramine needs extra care in pregnancy, in older adults, and in children. It falls in Pregnancy Category C, meaning risk can’t be ruled out—Category C doesn’t mean the drug is known to harm a baby, only that the data can’t clear it—and some newborns exposed up to delivery have shown neonatal withdrawal, including jitteriness, tremor, and seizures, so the drug is advised in pregnancy only when the benefit justifies the risk. Clomipramine also passes into breast milk.
Older adults face a higher load of anticholinergic effects, plus a greater risk of low blood sodium and of falls from dizziness, and hallucinations can be more frequent in this group, so lower starting doses are standard. In children, clomipramine is approved only for OCD, and only from age 10 up, with the same boxed-warning monitoring for suicidal thoughts that applies to all younger patients.
Managing and Reducing Side Effects
Most everyday Anafranil side effects respond to simple, practical steps while the dose is dialed in. None of these replace medical advice, but they can make the early weeks easier:
- Dry mouth: sip water through the day, try sugar-free gum, and keep up dental care.
- Constipation: add fiber and fluids and stay active; tell your prescriber if it doesn’t improve.
- Dizziness: rise slowly from sitting or lying down to avoid lightheadedness.
- Drowsiness: ask whether shifting the dose timing helps, and use caution with driving until you know how it affects you.
- Sun sensitivity and sweating: use sun protection and stay cool and hydrated.
The thread running through all of these is the same: keep the prescriber informed. A dose adjustment, a timing change, or switching medications can resolve a side effect that self-care alone can’t.
Frequently Asked Questions
Is Anafranil addictive?
No. Clomipramine hasn't been shown to cause drug-seeking behavior and isn't addictive like opioids or stimulants. It can still cause withdrawal symptoms if stopped suddenly, which is why doctors taper the dose.
How long do Anafranil side effects last?
Many early effects like nausea, dizziness, and drowsiness ease within the first few weeks as the body adjusts. Weight gain and sexual side effects can last longer and may need a dose change. Talk to your prescriber if effects are severe or persistent.
Can you drink alcohol while taking clomipramine?
It's best to avoid it. Alcohol and other depressants add to clomipramine's drowsiness and dizziness, and alcohol is commonly involved in dangerous TCA overdoses. Ask your prescriber about your specific situation.
Does clomipramine cause weight gain?
It can. About 18% of adults in clinical trials reported weight gain, versus 1% on placebo. Increased appetite was also reported. Weight changes tend to develop over months and are worth tracking with your prescriber.
What happens if you stop Anafranil suddenly?
Stopping abruptly can cause withdrawal: dizziness, nausea, vomiting, headache, sleep problems, fever, and irritability. OCD or mood symptoms may also return. A gradual, doctor-supervised taper lowers these risks.
Does Anafranil affect sex drive?
Often, yes. Around 21% of adults reported a change in libido, and sexual problems were common in men (about 42% ejaculation failure, 20% impotence). These effects are usually dose-related and may improve with an adjustment or a medication switch.
Getting Help Through Reach Recovere
Side effects, drug mixing, and stopping a medication safely are easier to handle with support. If OCD or depression is tangled up with substance use, or if a loved one needs help coming off a medication the right way, Reach Recovere can point you toward care. As a nonprofit, we use a Find-and-Fund approach: find treatment that fits the situation, then help sort out how to pay for it. Our directory connects people with medically supervised options for tapering, co-occurring mental health and substance use care, and ongoing support.
You don't have to figure this out alone. Search Reach Recovere's directory to find treatment and support that fit your needs.
Search the DirectoryIf you or someone else may be having a medical emergency or overdose, call 911. For a suspected poisoning or overdose, contact Poison Help at 1-800-222-1222. If you're having thoughts of suicide or self-harm, call or text the 988 Suicide & Crisis Lifeline (dial 988). For free, confidential, 24/7 treatment referrals, reach SAMHSA's National Helpline at 1-800-662-HELP (4357).
This article is for general information only and is not a substitute for professional medical advice, diagnosis, or treatment. Do not start, stop, or change a medication without talking to a qualified healthcare provider. Always follow your prescriber's guidance.
Sources
- U.S. Food and Drug Administration / DailyMed. Anafranil (clomipramine hydrochloride) Capsules USP, prescribing information. dailymed.nlm.nih.gov
- National Institutes of Health, National Library of Medicine. StatPearls: Clomipramine. ncbi.nlm.nih.gov/books/NBK541006
- Substance Abuse and Mental Health Services Administration (SAMHSA). National Helpline. samhsa.gov
- 988 Suicide & Crisis Lifeline. 988lifeline.org
Patrick Bailey
I am a professional writer, mainly in the fields of mental health, addiction, and living in recovery. I attempt to stay on top of the latest news in the addiction and the mental health world and enjoy writing about these topics to break the stigma associated with them.
Patrick Bailey
I am a professional writer, mainly in the fields of mental health, addiction, and living in recovery. I attempt to stay on top of the latest news in the addiction and the mental health world and enjoy writing about these topics to break the stigma associated with them.