Clemastine

Generic name: Clemastine
Drug class: Antihistamines

Usage of Clemastine

Clemastine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose.

Clemastine is used to treat sneezing, runny nose, watery eyes, itching, and other cold or allergy symptoms.

Clemastine is may also be used for purposes not listed in this medication guide.

Clemastine side effects

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Side effects may be more likely in older adults.

Common side effects of clemastine may include:

  • drowsiness;
  • blurred vision; or
  • feeling restless or excited (especially in children).

    • This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

    Before taking Clemastine

    You should not use clemastine if you are allergic to it.

    Ask a doctor or pharmacist if it is safe for you to use clemastine if you have other medical conditions, especially:

  • bronchitis, emphysema, or other breathing disorder;
  • an ulcer or obstruction in the stomach;
  • glaucoma; or
  • an enlarged prostate, urination problems.

    • This medicine is not expected to cause harm to an unborn baby. Ask a doctor before using this medicine if you are pregnant.

    Clemastine may pass into breast milk and may harm a nursing baby. Antihistamines may also slow breast milk production. Ask a doctor before using this medicine if you are breast-feeding.

    Do not give this medicine to a child younger than 12 without medical advice.

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    How to use Clemastine

    Usual Adult Dose for Allergic Rhinitis:

    Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

    Usual Adult Dose for Urticaria:

    Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

    Usual Adult Dose for Allergic Reaction:

    Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day

    Usual Pediatric Dose for Allergic Reaction:

    < 6 years:0.335 to 0.67 mg/day orally divided into 2 or 3 doses. Maximum daily dose is 1.34 mg.6 to 12 years:0.67 to 1.34 mg orally twice a day. Maximum daily dose is 4.02 mg.> 12 years:Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

    Usual Pediatric Dose for Allergic Rhinitis:

    < 6 years:0.335 to 0.67 mg/day orally divided into 2 or 3 doses. Maximum daily dose is 1.34 mg.6 to 12 years:0.67 to 1.34 mg orally twice a day. Maximum daily dose is 4.02 mg.> 12 years:Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

    Usual Pediatric Dose for Urticaria:

    < 6 years:0.335 to 0.67 mg/day orally divided into 2 or 3 doses. Maximum daily dose is 1.34 mg.6 to 12 years:0.67 to 1.34 mg orally twice a day. Maximum daily dose is 4.02 mg.> 12 years:Initial dose: 1.34 mg orally twice a day. Dosage may be increased as required, but not to exceed 2.68 mg orally 3 times a day.

    Warnings

    Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

    What other drugs will affect Clemastine

    Ask a doctor or pharmacist before using this medicine if you are also using any other drugs, including prescription and over-the-counter medicines, vitamins, and herbal products. Some medicines can cause unwanted or dangerous effects when used together. Not all possible interactions are listed in this medication guide.

    Taking this medicine with other drugs that make you sleepy or slow your breathing can worsen these effects. Ask your doctor before taking clemastine with a sleeping pill, narcotic pain medicine, muscle relaxer, or medicine for anxiety, depression, or seizures.

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