# Clomicalm for Dogs: Dosing, Uses, and Side Effects Clomicalm is the brand name for clomipramine hydrochloride, a prescription tricyclic antidepressant that veterinarians use to treat separation anxiety in dogs. It is given by mouth, usually twice a day, and it is approved for dogs older than 6 months. Clomicalm does not sedate a dog into calmness. It raises the brain's available serotonin and norepinephrine so that the dog can actually learn from behavior modification training. That combination, daily medication plus a structured training plan, is the treatment that has been studied and shown to work [1][2]. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## At a Glance | Feature | Detail | |--|--| | Active ingredient | Clomipramine hydrochloride | | Drug class | Tricyclic antidepressant (TCA) | | Species and age | Dogs older than 6 months | | Labeled use | Separation anxiety in dogs | | How it is given | Orally, typically every 12 hours | | Typical starting dose | 1 to 2 mg/kg twice daily | | Time to full effect | 4 to 6 weeks for many dogs | | Duration of treatment | Often several months, tapered at the end | | Prescription status | Prescription only in the United States | | Must be paired with | Behavior modification training | ## What Clomicalm Is and What It Treats Clomicalm is a veterinary-labeled medication containing clomipramine, a tricyclic antidepressant. In the United States it is available only by prescription, which means a veterinarian must examine the dog, confirm the diagnosis, and set the dose before the drug is dispensed. It is not a sedative and it is not a quick fix for a dog that is simply bored or undertrained. The core labeled indication is separation anxiety. A dog with separation anxiety shows distress when left alone. The classic signs are destruction (chewing doors, window frames, furniture), house soiling with urine or stool, and vocalization such as barking, howling, or whining, all occurring specifically in the owner's absence [1]. Veterinarians also look for hyper-attachment, meaning the dog follows the owner from room to room and becomes agitated at the first sign of departure [1][3]. Clomipramine has been studied and used beyond that core indication. It has been evaluated in dogs with compulsive disorders such as spinning and acral lick dermatitis [4], in tail chasing [5], in storm phobia when combined with another medication and training [6], and in fear or anxiety during transport [7]. It has also been tried in dominance-related aggression, where it did not outperform placebo in a controlled trial [8]. Because those uses are not all on the label, a veterinarian recommending clomipramine for one of them is prescribing it off-label, which is legal and common in [veterinary medicine](/blog/careers/veterinary-medicine-careers-from-clinical-practice-to-public-health) when the veterinarian judges it appropriate for that patient. One point matters more than any other. Clomipramine is an adjunct to behavior modification, not a replacement for it. Every major clinical trial that showed a benefit from this drug gave the dogs behavioral therapy at the same time [9][1][2]. A case report of an 8-month-old goldendoodle with separation and confinement anxiety described success only after clomipramine was paired with "safe haven" training and a structured behavior modification plan [10]. ## How Clomipramine Works Clomipramine inhibits the reuptake of serotonin and norepinephrine in the brain. After a neuron releases these neurotransmitters into the gap between nerve cells, reuptake is the process that pulls them back in and shuts the signal down. Clomipramine blocks that reuptake pump, so serotonin and norepinephrine stay in the gap longer and keep signaling. The result is a more stable, less reactive emotional state over time. That mechanism explains the delay owners notice. The drug does not work like a sedative that takes effect within an hour. It gradually changes the neurochemical environment, and the behavioral benefit builds over weeks. It also explains why training works better on medication. A dog whose anxiety is dampened can pay attention, tolerate being alone for short periods, and learn that departures are not dangerous. Clomipramine also inhibits P-glycoprotein, a transport protein that helps move drugs and other molecules across cell membranes, including at the blood-brain barrier. In a canine cell model, clomipramine inhibited this transporter by 59 percent at a tested concentration [11]. This is one reason clomipramine can interact with other medications, and it is a reason veterinarians ask about every drug and supplement a dog receives before starting treatment. ## Clomicalm Dosing for Dogs Dosing is weight-based and set by the veterinarian. The label dose for separation anxiety is 1 to 2 mg/kg given by mouth every 12 hours. The table below converts that range into common weight bands. It is a reference for understanding what your veterinarian is likely to prescribe, not an instruction to dose your own dog. | Body weight | Label dose range per dose (1 to 2 mg/kg) | Typical frequency | |--|--|--| | 5 lb (2.3 kg) | 2.3 to 4.5 mg | Every 12 hours | | 10 lb (4.5 kg) | 4.5 to 9 mg | Every 12 hours | | 20 lb (9.1 kg) | 9.1 to 18.2 mg | Every 12 hours | | 30 lb (13.6 kg) | 13.6 to 27.3 mg | Every 12 hours | | 40 lb (18.2 kg) | 18.2 to 36.4 mg | Every 12 hours | | 50 lb (22.7 kg) | 22.7 to 45.5 mg | Every 12 hours | | 60 lb (27.3 kg) | 27.3 to 54.5 mg | Every 12 hours | | 80 lb (36.4 kg) | 36.4 to 72.7 mg | Every 12 hours | | 100 lb (45.5 kg) | 45.5 to 90.9 mg | Every 12 hours | Clomicalm tablets are scored so doses can be split, and veterinarians usually round to the nearest practical tablet size. Because the drug is dosed by body weight and the tablet strengths are fixed, the exact milligram amount your dog receives may sit anywhere inside the range above. Follow the number on the prescription label, not a number from a table. Dose escalation is sometimes used. In a preliminary clinical study of dogs with compulsive disorder, separation anxiety, and noise phobia, clomipramine was started at 1 to 2 mg/kg twice daily and increased step by step to a maximum of 4 mg/kg when the response was incomplete [9]. That ceiling is a clinical decision made by a veterinarian who is tracking the dog's response and side effects. Owners should never raise the dose on their own. Other studies have used different protocols for different problems. A controlled trial in storm phobia used 2 mg/kg every 12 hours for three months, then stepped the dose down to 1 mg/kg and then 0.5 mg/kg at two-week intervals [6]. A trial in compulsive disorder used 3 mg/kg every 12 hours for four weeks [4]. These are research protocols, not label instructions, and they show that the right dose depends on the diagnosis and the individual dog. ### How to Give Clomicalm Give the tablet by mouth with or without food, at as close to the same times each day as possible. A twice-daily schedule keeps blood levels steady, which is part of why the drug works. If your dog is a picky eater, a small amount of food or a pill pocket is fine unless your veterinarian says otherwise. Do not crush or hide the tablet in a whole meal if the dog might not finish it, because a missed dose is better than an unpredictable one. If you miss a dose, give it when you remember unless it is nearly time for the next one. In that case, skip the missed dose and continue the normal schedule. Do not double up. ### The 4 to 6 Week Timeline Owners often expect change within days and give up too early. The realistic timeline runs in weeks, not hours. | Time point | What to expect | |--|--| | Days 1 to 7 | Possible mild lethargy or appetite change. Little to no behavioral change yet. | | Weeks 2 to 3 | Early calming may appear. Side effects often settle. Training continues. | | Weeks 4 to 6 | Full benefit typically reached. Improvement in destruction, soiling, and vocalization. | | Weeks 6 to 8 | Veterinary recheck to assess response and adjust dose if needed. | | Months 2 to 4 | Continued treatment plus training. Many dogs stay on medication for months. | | Taper phase | Dose reduced gradually over weeks once signs are controlled. | The clinical trial data support this slow build. In a large randomized, double-blind, placebo-controlled study of 95 dogs with separation anxiety, dogs on standard-dose clomipramine (1 to under 2 mg/kg every 12 hours) were rated improved at least three times faster than placebo dogs for destruction, defecation, and urination, with assessments at days 0, 28, 56, and 84 [1]. Improvement was measured at the four-week mark and beyond, which is the practical message for owners: judge the drug at one month, not at one week. Treatment usually continues for at least one month after the signs have disappeared or dropped to an acceptable level, and then the dose is reduced gradually, often at weekly intervals, rather than stopped abruptly [9]. Abrupt withdrawal can trigger a return of anxiety or withdrawal effects, so the taper is part of the treatment, not an afterthought. ## Behavior Modification Is Not Optional Medication alone is not the standard of care for separation anxiety. The evidence is consistent on this point. In the pivotal separation anxiety trial, every dog in every group, including the placebo group, received behavioral therapy [1]. In a study of 49 dogs with separation-related problems, all dogs received behavioral therapy alongside either placebo or one of two clomipramine doses [2]. In a comparison trial of 67 dogs, clomipramine was tested against a dog-appeasing pheromone, and both groups improved, with no significant difference between treatments on the owners' overall assessment [3]. A veterinary review of separation anxiety treatment describes the approach plainly: develop a behavior modification protocol that gradually desensitizes and counter-conditions the dog to being left alone, and reward calm, relaxed behavior, with medication as a useful adjunct [12]. Desensitization means exposing the dog to departures in tiny, tolerable steps. Counter-conditioning means pairing those steps with something pleasant so the emotional response changes. Practical elements of a training plan typically include: - Practicing very short absences, starting with seconds, and building duration only when the dog stays relaxed. - Decoupling departure cues, such as picking up keys or putting on shoes without leaving, so those cues stop predicting panic. - Providing a safe, comfortable space and a predictable routine. - Avoiding punishment for destruction or soiling that happened while the owner was away. Punishment after the fact does not teach the dog anything about the departure and can worsen anxiety. - Rewarding calm behavior at every opportunity. A case report on a goldendoodle with separation and confinement anxiety is a useful illustration of how individualized this gets. The dog had not responded well to paroxetine or lorazepam, and the successful plan involved clomipramine, safe haven training, and behavior modification [10]. That case also shows that the first medication tried is not always the one that works, and that the plan may need to change based on the patient. ## Side Effects of Clomicalm in Dogs Most dogs tolerate clomipramine, but side effects happen. In a controlled study of clomipramine for compulsive disorder, sedation and reduced appetite were reported more often in dogs receiving clomipramine than in dogs receiving placebo, and no serious adverse effects were seen [4]. The side effects owners most commonly report include: - **Lethargy or sedation.** This is the most frequent complaint. It often appears in the first week and eases as the dog adjusts. Persistent heavy sedation is a reason to call the veterinarian about a dose adjustment. - **Vomiting.** Giving the tablet with a small amount of food can reduce stomach upset. Repeated vomiting is a reason to call. - **Diarrhea.** Mild digestive upset may settle. Diarrhea that lasts more than a day or two, or that comes with blood or lethargy, needs veterinary attention. - **Changes in appetite.** Both reduced appetite and increased appetite are possible. Reduced appetite was reported more often with clomipramine than with placebo in a controlled trial [4]. - **Dry mouth, constipation, or urinary retention.** These are anticholinergic effects that can occur with tricyclic antidepressants. Report any change in urination or bowel habits. - **Behavioral changes.** Some dogs become more anxious, agitated, or restless rather than calmer. This is a reason to call the veterinarian promptly. - **Rare seizures.** Seizures are an uncommon but serious concern with tricyclic antidepressants. A dog with a seizure history should be evaluated carefully before starting clomipramine. Any seizure during treatment is an emergency. There is one rare and serious adverse event worth knowing about. A case report described a 3-year-old Yorkshire terrier that developed acute pancreatitis after seven weeks on clomipramine, with severe abdominal pain and vomiting. The dog had two earlier, milder episodes tied to previous courses of the drug, and recovered within 48 hours with supportive care after the medication was stopped. The authors concluded that clomipramine should be considered a potential cause when a dog on the drug presents with signs compatible with pancreatitis [13]. This is a single case, not a common outcome, but it is a reason to take severe vomiting or abdominal pain seriously in a dog taking clomipramine. ### What to Do About Side Effects Mild lethargy, soft stool, or a small appetite change in the first week is common and often temporary. Keep a simple daily log of what you see, and bring it to the recheck. Do not stop the medication abruptly on your own, because sudden withdrawal can cause problems. Call the veterinarian instead, and let them decide whether to lower the dose, change the timing, or switch drugs. Call right away for any of the following: - A seizure - Severe or repeated vomiting - Severe abdominal pain, a hunched posture, or refusal to eat - Bloody diarrhea - Collapse, extreme weakness, or difficulty breathing - Marked agitation, restlessness, or a sudden worsening of anxiety - Yellowing of the gums, eyes, or skin - Any sign that worries you, even if it is not on this list ## Dogs That Should Not Receive Clomicalm Clomipramine is not right for every dog. The veterinarian will review the history before prescribing. Situations that require caution or that rule the drug out include: - **Dogs younger than 6 months.** The label is for dogs older than 6 months. - **Dogs taking an MAOI.** Combining clomipramine with a monoamine oxidase inhibitor can cause a dangerous buildup of serotonin and norepinephrine. This combination is avoided. - **Dogs taking an SSRI.** Clomipramine and selective serotonin reuptake inhibitors such as fluoxetine both increase serotonin signaling. Combining them raises the risk of serotonin syndrome, which can cause agitation, tremors, rapid heart rate, and elevated body temperature. If a dog is switching from one to the other, the veterinarian will plan a washout period between drugs. - **Dogs with a seizure history.** Seizures are a rare side effect, so a dog with epilepsy needs a careful risk-benefit discussion. - **Dogs with heart disease, liver disease, or kidney disease.** Tricyclic antidepressants can affect heart rhythm and are cleared by the liver, so pre-existing organ disease changes the calculation. - **Dogs with glaucoma or urinary retention.** Anticholinergic effects can worsen these conditions. - **Pregnant or nursing dogs.** The safety of clomipramine in breeding, pregnant, or lactating dogs is not established, so the veterinarian will weigh the risks. - **Dogs on multiple other medications.** Because clomipramine inhibits P-glycoprotein and interacts with other drugs, a full medication and supplement list is essential [11]. ## Drug Interactions to Know About Interactions are one of the most important safety topics with clomipramine. Before your dog starts the drug, tell the veterinarian every medication, supplement, and topical product your dog receives, including flea and tick preventives, heartworm preventives, pain medications, and anything given occasionally. The two interactions that matter most are: **MAOIs.** Monoamine oxidase inhibitors block an enzyme that breaks down serotonin, norepinephrine, and other monoamines. Adding clomipramine on top of an MAOI can push these neurotransmitters to dangerous levels. This combination is avoided. **SSRIs and other serotonergic drugs.** Fluoxetine and other SSRIs increase serotonin signaling, and so does clomipramine. Used together, they can cause serotonin syndrome. The same concern applies to other drugs that raise serotonin. A veterinarian managing a switch between clomipramine and an SSRI will use a washout period rather than overlapping the two. Other interactions to discuss with the veterinarian include: - Other antidepressants and anti-anxiety medications - Tramadol and other pain medications that affect serotonin - Certain antifungals and antibiotics that affect liver enzymes - Antiarrhythmic heart medications - Anticholinergic drugs, which can compound dry mouth, constipation, and urinary retention - Seizure medications, since clomipramine can lower the seizure threshold Never add an over-the-counter medication, supplement, or herbal product without asking, because some natural products also affect serotonin. ## How Clomicalm Compares With Other Options Clomipramine is one of several medications used for anxiety in dogs, and the choice depends on the diagnosis, the dog's health, and the owner's situation. **Fluoxetine.** Fluoxetine is an SSRI used for anxiety-related behaviors in dogs. A 2024 evidence review appraised three controlled studies and found that both fluoxetine and clomipramine reduce symptoms of fear and anxiety in adult dogs, and that both are effective for acral lick dermatitis and tail chasing, with no evidence that one is more effective than the other [14]. A separate randomized trial in dogs with tail chasing found clomipramine and fluoxetine equally effective, with clomipramine outperforming placebo in the early and middle weeks of treatment [5]. In practice, the choice often comes down to side effect profile, dosing convenience, and how the individual dog responds. **Dog-appeasing pheromone.** A randomized, blinded trial compared a dog-appeasing pheromone with clomipramine in 67 dogs with separation-related distress. Undesirable behaviors decreased in both groups, and the owners' overall assessment found no significant difference between the two treatments, though there were fewer undesirable events in the pheromone group and the pheromone was more convenient to administer [3]. This is a reasonable option to discuss for dogs that cannot take medication or for owners who prefer a non-drug approach. **Combination therapy.** For some problems, clomipramine is combined with a second medication. In a study of 40 dogs with storm phobia, clomipramine at 2 mg/kg every 12 hours was combined with alprazolam given before anticipated storms, plus desensitization and counter-conditioning. Thirty of the 32 dogs that completed the study improved, and improvement was maintained four months later [6]. Combination therapy increases the interaction risk, so it requires close veterinary supervision. **Trazodone.** Real-world prescribing data from a large network of US primary care hospitals showed trazodone prescriptions rising sharply after 2015, far outpacing clomipramine and fluoxetine [15]. That pattern reflects changing prescribing habits rather than evidence that one drug is better. What matters for your dog is the diagnosis and the plan your veterinarian builds around it. ## Questions to Ask Your Veterinarian Bring a written list to the appointment. Useful questions include: 1. What is the specific diagnosis, and is separation anxiety the primary problem or is something else contributing? 2. What dose are you prescribing, and what is the exact schedule? 3. What side effects should I watch for, and which ones mean I should call immediately? 4. How long should I expect before I see improvement, and when is the first recheck? 5. What behavior modification plan should I follow, and can you give me written steps? 6. Are there any interactions with my dog's current medications or preventives? 7. How long will my dog stay on the medication, and how will we taper it? 8. What should I do if I miss a dose or if my dog vomits after taking it? ## Limitations and When to Contact a Veterinarian This article describes how clomipramine is used in dogs in general terms. Every dog is an individual, and the right dose, duration, and monitoring plan depend on the dog's diagnosis, weight, health history, and response to treatment. Your veterinarian is the only person who can make those decisions for your dog. Contact a veterinarian promptly if any of the following occur: - A seizure, collapse, or difficulty breathing - Severe or repeated vomiting, or severe abdominal pain - Bloody diarrhea or diarrhea lasting more than two days - Refusal to eat for more than 24 hours - Marked sedation that does not improve after the first week - New or worsening agitation, restlessness, or anxiety - Signs of serotonin syndrome, including tremors, rapid heart rate, confusion, or elevated body temperature - Any change in urination, including straining or inability to urinate - Yellowing of the gums, eyes, or skin - No improvement after 4 to 6 weeks of treatment at the prescribed dose - Any behavior that concerns you, including a return of the original problem during tapering Do not stop clomipramine abruptly. Call the veterinarian and ask how to taper safely. ## Frequently Asked Questions ### How long does Clomicalm take to work in dogs? Most dogs need 4 to 6 weeks at the prescribed dose before the full benefit appears. Some improvement may show up in the first two to three weeks, and the first formal recheck is often around four to six weeks. ### What is the usual Clomicalm dose for dogs? The label dose for separation anxiety is 1 to 2 mg/kg given by mouth every 12 hours. Your veterinarian sets the exact dose based on your dog's weight and response. Some clinical protocols start at 1 to 2 mg/kg and increase up to 4 mg/kg if needed [9]. ### Can I give Clomicalm without behavior modification training? No. Every major study that showed a benefit from clomipramine also gave the dogs behavioral therapy [9][1][2]. Medication lowers anxiety enough for training to work, and training is what teaches the dog to cope with being alone. ### What are the most common side effects of Clomicalm in dogs? Lethargy, vomiting, diarrhea, and changes in appetite are the most common. Sedation and reduced appetite were reported more often with clomipramine than with placebo in a controlled trial [4]. Most mild effects settle within the first week or two. ### Can Clomicalm be given with fluoxetine or other antidepressants? Combining clomipramine with an SSRI such as fluoxetine or with an MAOI is avoided because of the risk of serotonin syndrome. If your dog needs to switch between these drugs, the veterinarian will plan a washout period. ### Is Clomicalm safe for puppies? Clomicalm is labeled for dogs older than 6 months. Younger dogs should not receive it unless a veterinarian has specifically evaluated the situation and made a different decision. ### What happens if I stop Clomicalm suddenly? Abrupt withdrawal can cause a return of anxiety or other withdrawal effects. Treatment is typically continued for at least a month after signs are controlled, then reduced gradually, often at weekly intervals [9]. Always ask your veterinarian how to taper. ### Do dogs need blood work while taking Clomicalm? Your veterinarian will decide whether monitoring tests are needed based on your dog's age, health history, and other medications. Bring your dog in for the scheduled rechecks, and report any new symptoms so the plan can be adjusted. ## Related Articles - [Prednisone for Dogs: Steroid Dosing Tapering and Side Effects](/knowledge/veterinary-medicine/calculators-clinical-tools/prednisone-for-dogs-steroid-dosing-tapering-and-side-effects) - [Librela Injection for Canine Osteoarthritis: Efficacy, Dosing and Side Effects](/knowledge/veterinary-medicine/orthopedic-mobility/librela-injection-for-canine-osteoarthritis-efficacy-dosing-and-side-effects) - [Cat Prednisolone for Allergies: Side Effects and Safe Use](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/cat-prednisolone-allergies) - [Dog Prednisone for Allergies: Side Effects and Safe Use](/knowledge/veterinary-medicine/skin-allergy-and-ear-care/dog-prednisone-allergies) - [Prednisone for Dogs: Uses, Side Effects, and Safety Guidelines](/knowledge/veterinary-medicine/preventive-care/prednisone-for-dogs-uses-side-effects-and-safety-guidelines) - [What Are the Side Effects of Gabapentin for Cats?](/knowledge/veterinary-medicine/pet-medication-guide/gabapentin-side-effects-cats) - [Meclizine Side Effects and Uses in Pets](/knowledge/veterinary-medicine/pet-medication-guide/meclizine-side-effects-and-uses-in-pets) - [Zenrelia Dosing Chart for Dogs and Side Effects](/knowledge/veterinary-medicine/pet-medication-guide/zenrelia-dosing-chart-for-dogs-and-side-effects) ## Sources 1. 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