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  • Mirtazapine is used for treatment of anxiety, to relieve nausea, and to stimulate appetite.

Mirtazapine Tablets


*Prescription Required: Vetsource®, our pharmacy provider, may need to contact your veterinary hospital for prescription verification.

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We'll collect your pet information to verify this prescription with your veterinarian before shipping. Your prescription order will ship upon veterinarian approval.
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Product Information

Mirtazapine may be used to treat chemotherapy-induced nausea/vomiting, anorexia associated with renal failure, congestive heart failure, GI disorders, liver disease, neoplasia, stress induced diseases, insomnia, post-pyometra symptoms, and post-op lack of appetite in dogs and cats. Mirtazapine is an tetracyclic antidepressant.

Active Ingredients

mirtazapine USP

Side Effects
Possible side effects may include drowsiness, dry mouth, urine retention, constipation and a faster heart rate. Your pet may experience some excitement, disorientation, and hyperactivity. If these symptoms persist, contact your veterinarian. Notify your veterinarian if symptoms are troublesome and continue.
Other side effects may occur. If you notice anything unusual, contact your veterinarian.

Developed For

Dogs and Cats

Product Benefits

Mirtazapine is used for treatment of anxiety, to relieve nausea, and to stimulate appetite.

Usage Guidelines

Mirtazapine should be given orally as directed by your veterinarian.


This medication does not have an FDA approved indication for use in animals, but it is a common and acceptable practice for veterinarians to prescribe this human medication for use in animals.
Inform your veterinarian if your pet has liver or kidney disease, epilepsy or other seizure disorder, or heart disease prior to beginning treatment. The safety of this medication has not been evaluated in pregnant, breeding, or nursing animals.
Mirtazapine should not be used in combinations with other antidepressants. Make sure to tell your veterinarian what other medication or supplements you are giving to your pet. Quite often your veterinarian may prescribe two different medications, even if a drug interaction may occur. In this case, your veterinarian may vary the dose and/or monitor your pet more closely. The following drugs can potentially interact with mirtazapine: clonidine, diazepam, fluvoxamine, linezolid, selegiline, amitraz, and tramadol. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.
Allergic reactions to medications may occur. Be sure to inform Vetsource and your veterinarian if your pet has any known drug sensitivities or allergies. If your pet displays symptoms of an allergic reaction, call your veterinarian immediately or go to a veterinary emergency clinic. Symptoms may include but are not limited to: swollen lips, tongue, face, airways; difficulty breathing; agitation; profuse salivation; vomiting; widespread hives and itching.