Clemastine Fumarate (Generic) Tablets, slide 1 of 1

Clemastine Fumarate (Generic) Tablets, 2.68-mg, 1 tablet

Prescription Item

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Clemastine Fumarate is a prescription for the treatment of allergies and atopy. It's an antihistamine used to control itching associated with allergies and is thought to have less of a sedative effect than some other antihistamines. Customers may receive this drug under the names Antihist-I, Dayhist, Tavist.

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Clemastine Fumarate tablets are indicated for the relief of symptoms associated with allergies, such as sneezing, stuffy nose, itchiness and runny nose. Clemastine is also indicated for the relief of mild, uncomplicated allergic skin manifestations.

Possible Side Effects

The most common adverse reaction is brief drowsiness, which occurs relatively frequently and may require discontinuation of therapy.

Drug & Food Interactions

Consult your veterinarian before using clemastine with vitamins and supplements, or other central nervous system (CNS) depressant drugs. Some of these CNS depressant drugs include barbiturates or antidepressants, and monoamine oxidase inhibitors (MAOIs) including furazolidine, selegiline (Anipryl), isoniazid and amitraz. Interactions with other medications, as well as flea and tick collars may also occur.


Clemastine fumarate should be used with caution in those with a history of bronchial asthma, increased pressure caused by fluid inside eye, hyperthyroidism, heart disease and high blood pressure.

This drug is FDA-approved for human use. However, it is common practice for veterinarians to prescribe such drugs for use in dogs and cats.

NOTE: For Generic Medications, picture displayed may not depict actual product. Generic medications may vary from one order to the next by size, color and shape depending on manufacturer. Please note product may arrive in a Chewy Pharmacy vial.

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  1. Prescribing Information

See all items by Clemastine

  • Item Number
  • Common Brand Name(s)
    Antihist-I, Dayhist, Tavist
  • For Use With
    Dogs & Cats
  • Generic Name
    Clemastine Fumarate
  • Administration Form
  • Product Form
  • Health Condition
  • Drug Type


Recommended Dosage

Clemastine tablets are given by mouth. Use only as directed. Do not stop this medication or change dosage without consulting a professional.

Storage Instructions

Store between 68° - 77°F.


What is Clemastine?

Clemastine is a prescription antihistamine for dogs and cats. Clemastine is used in for the treatment of allergies and atopy, primarily to stop itching.

What are the benefits of Clemastine Tablets?

  • Prescription antihistamine in tablet form for cats and dogs.
  • Clemastine is used to stop itching due to allergies and atopy.
  • Less sedative side effect compared to other antihistamines.

How is this medication given?

Clemastine is given by mouth. Duration of treatment depends on the reason for and response to treatment. Always follow the dosage instructions provided by your veterinarian. If you have difficulty giving the medication, contact your veterinarian. This medication should only be given to the pet for whom it was prescribed.

How does this medication work?

Clemastine works by blocking the actions of histamine in the body. Histamine is the chemical responsible for many of the symptoms seen when an allergic reaction occurs. Clemastine belongs to a group of antihistamines called H1 blockers.

What results can I expect?

Clemastine will not cure allergies, but can help reduce the symptoms. The effects will disappear if the medication is discontinued. Results may not be immediate and it can take several weeks to see improvement.

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