Clomipramine (Clomicalm) for Dogs: Uses, Dosage & Side Effects

See your vet immediately if your dog has collapsed, is having a seizure, cannot urinate, has a very fast or irregular heartbeat, or may have taken too much clomipramine. This medication can also be dangerous when combined with some other anxiety drugs, flea and tick products, or human antidepressants.

This article is educational and does not replace veterinary advice. Clomipramine dosing, monitoring, and drug safety depend on your dog’s age, weight, medical history, and other medications. Your vet should decide whether this medication fits your dog’s situation and how it should be started, adjusted, or tapered.

Clomipramine is a prescription tricyclic antidepressant used in dogs to help reduce anxiety-driven behaviors. It affects serotonin and norepinephrine signaling in the brain, which can lower panic, distress, and repetitive behaviors in some dogs. The veterinary brand name is Clomicalm.

In the United States, Clomicalm is FDA-approved for separation anxiety in dogs older than 6 months when it is used as part of a comprehensive behavior management program. That matters. Medication may lower the emotional intensity, but most dogs still need a structured training plan to learn calmer responses when left alone.

Your vet may also prescribe clomipramine off-label for other behavior problems, including some compulsive disorders or broader anxiety patterns. Off-label use is common in veterinary medicine, but it should still be tailored to your dog rather than copied from another pet or from human dosing instructions.

The best-known use for clomipramine in dogs is separation anxiety. Dogs with separation anxiety may vocalize, pace, drool, chew doors or crates, scratch at exits, have accidents indoors, or injure themselves trying to escape when left alone. Clomipramine is meant to support behavior work, not replace it.

Your vet may also consider clomipramine for compulsive behaviors such as repetitive licking, spinning, flank sucking, or tail chasing, especially when medical causes have already been ruled out. In some dogs it is also used off-label for certain phobias or generalized anxiety, although other medications may be a better fit depending on the trigger pattern and your dog’s health history.

This is not a fast-acting situational medication. It is given consistently, usually every day, and many dogs need several weeks before the full benefit is clear. Some improvement may show up earlier, but behavior medications are usually judged over time, with your vet tracking both side effects and progress at home.

For dogs, commonly referenced dosing is 2 to 4 mg/kg by mouth per day total, either as 1 to 2 mg/kg every 12 hours or 2 to 4 mg/kg once daily, depending on the product, tablet size, and your vet’s plan. Merck lists the labeled dose this way, and veterinary product information commonly uses the twice-daily schedule. Your vet may choose the schedule that best matches your dog’s size, tolerance, and response.

Clomipramine can be given with or without food, but giving it with a small amount of food may help if vomiting occurs. Try to give it at the same time each day. If you miss a dose, ask your vet or follow the label directions rather than doubling up.

Do not stop clomipramine abruptly unless your vet tells you to. Dogs coming off long-term behavior medication often do best with a gradual taper. It is also important to allow enough time before deciding it is not helping. Many dogs need 4 to 6 weeks, and sometimes longer, before your vet can fairly assess the response.

Common side effects include vomiting, diarrhea, lower appetite, tiredness, sedation, dry mouth, constipation, and increased thirst. Mild stomach upset or sleepiness may improve after the first days to weeks as your dog adjusts. If side effects are mild, your vet may recommend monitoring, changing timing, or giving doses with food.

More serious reactions need prompt veterinary attention. These include fast or irregular heartbeat, seizures, severe agitation, fever, collapse, trouble urinating, coma, or marked lethargy. Clomipramine should be avoided or used very cautiously in dogs with a seizure history, some heart conditions, glaucoma, urinary retention, reduced gut motility, or liver disease.

A rare but urgent concern is serotonin syndrome, which can happen when clomipramine is combined with other drugs that raise serotonin. Signs can include agitation, tremors, diarrhea, fever, rapid heart rate, and neurologic changes. If your dog develops these signs, see your vet immediately.

Clomipramine has several important interactions, so your vet should review every medication, supplement, and flea or tick product your dog receives. The most important rule is that clomipramine should not be used together with a monoamine oxidase inhibitor (MAOI) or within 14 days before or after one. That includes selegiline and some amitraz-containing flea and tick products.

Other medications can also raise risk. These include SSRIs such as fluoxetine or sertraline, trazodone, tramadol, some opioids, ondansetron, metoclopramide, certain antibiotics, azole antifungals, cimetidine, anticholinergic drugs, and other sedating medications. Combining drugs is sometimes appropriate, but only when your vet has planned the timing and monitoring.

Because clomipramine can affect heart rhythm, seizure threshold, and lab values such as thyroid testing or blood glucose interpretation, your vet may recommend baseline bloodwork and, in selected dogs, an ECG before starting treatment.