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Last updated on November 22nd, 2021

Generic name: Clemastine

Brand names: Tavist

What is Tavist (clemastine)?

Tavist (clemastine) is a popular medicament which belongs to antihistamine. This remedy is given to help relieve cold- and allergy-related syndromes such as hives, rash, sneezing, stuffy nose, red and inflamed eyes, swelling, itching or redness. Contact your doctor if you need to learn more about this remedy.

What important information should I know about Tavist (clemastine)?

Like other antihistamines, Tavist may make you drowsy or deteriorate your coordination. Be very careful about doing dangerous tasks, climbing, driving, operating machinery until you are aware how this drug affects you. Don’t drink alcohol during treatment with this medication. Always contact a doctor before giving Tavist to a child. Don’t use this drug if you are taking a type of medicine called a monoamine oxidase inhibitor (MAOI). MAOIs include the antidepressants moclobemide, tranylcypromine, phenelzine and isocarboxazid.

What symptoms or conditions should I report to a doctor before I take this medicine?

It is important to report to a doctor if you have or had the following conditions:

  • a stomach ulcer
  • asthma
  • increased pressure in the eye or glaucoma
  • hypertension or any type of heart problems
  • an overactive thyroid (hyperthyroidism)
  • pregnancy, breastfeeding or planning to become pregnant
  • an enlarged prostate, bladder problems, or difficulty urinating

How do I take this medicine?

Note: This remedy was prescribed to you only. Do not share this medicament with others. Tavist comes in pill or syrup form to take orally.

The usual oral dosage for adults and children 12 years old and up is one tablet (1.34 mg of clemastine fumarate) every 12 hours. It is not advisable to take more than two tablets in 24 hours only if your medic prescribes a higher dose.

Children under the age of 12 should not take Tavist.

Elderly persons may be more sensitive to the influence of this medicine and may demand lower doses.

The tablets should be swallowed whole. Do not crush or chew them. Use a specially marked measuring spoon to be sure of the correct dose. This medication may be taken with food to help prevent stomach upset. Tavist may be taken either on a full or on an empty stomach.


What should I do if I miss the dose?

If you miss the dose, try to take it as soon as you have the opportunity. If it is time for your next dose, take only one dose. You don’t have to double the dose.

What should you do if you overdose of Tavist?

Any medicine taken in large doses can have serious consequences. An overdose of Tavist can be fatal, especially in children. If you feel an overdose, inform your doctor straightway.

Overdose of Tavist may may cause the following conditions:

  • severe heart problems
  • dilated pupils
  • decreased breathing
  • extreme drowsiness
  • low blood pressure
  • unconsciousness
  • seizures
  • coma
  • high body temperature

What drug(s) may interact with Tavist?

  •     Actifed (pseudoephedrine/triprolidine)
  •     Benadryl Allergy (diphenhydramine)
  •     Betapace (sotalol)
  •     Budeprion SR (bupropion)
  •     Coumadin (warfarin)
  •     Dilantin (phenytoin)
  •     Florastor (saccharomyces boulardii lyo)
  •     Guaifen NR (guaifenesin)
  •     Keppra (levetiracetam)
  •     Lexapro (escitalopram)
  •     Lipitor (atorvastatin)
  •     Methotrexate
  •     Mucinex (guaifenesin)
  •     Omeprazole
  •     Prednisone
  •     Protonix (pantoprazole)
  •     Seroquel (quetiapine)
  •     Tums Regular Strength (calcium carbonate)
  •     VESIcare (solifenacin)
  •     Warfarin

This is not a finished list of interactions. Inquire your medic before taking this medicine for a specific disease. Discuss with your doctor the use of your medicine with food, alcohol, or tobacco.

What side-effects may occur?

  •     Drowsiness, sleepiness
  •     Headache, dizziness
  •     Indigestion or upset stomach
  •     Increased chest congestion
  •     Difficulty urinating (urinary retention) or an enlarged prostate
  •     Mental, mood changes (e.g., unusual excitement, restlessness, confusion, hallucinations, blurred vision)
  •     Loss of appetite
  •     Fatigue, faintness
  •     Thirst or dry mouth, nose, or throat
  •     Problems with co-ordination
  •     Early menstrual period
  •     Nausea, vomiting
  •     Fast/pounding/irregular heartbeat (palpitations)
  •     Increased sensitivity of the skin to sunlight (photosensitivity)
  •     Numbness or tingling in your hands or feet (tremor)
  •     Low blood pressure (hypotension)
  •     Convulsions(seizures)
  •     Skin rash or swelling

If these persist or worsen, make known to your doctor promptly. This is not a complete list of side effects and others may occur. If you feel other reactions not stated above, contact your doctor or pharmacist.

How should Tavist be stored?

Tavist should be stored at room temperature, between 59-86 degrees F (15-30 degrees C), in a tightly closed container. Protect from moisture, direct heat, and light. Do not freeze the liquid form. Do not store in the bathroom or near a sink. Keep Tavist out of the reach of children and away from pets.

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