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Last reviewed on RxList: 4/18/2013
Chlor-Trimeton Side Effects Center

Last reviewed on RxList 9/16/2016

Chlor-Trimeton (chlorpheniramine maleate) is an antihistamine used to treat sneezing, itching, watery eyes, and runny nose caused by allergies or the common cold. Chlor-Trimeton is available in generic form and over-the-counter (OTC). Common side effects of Chlor-Trimeton include:

  • drowsiness,
  • dizziness,
  • blurred vision,
  • dry mouth/nose/throat,
  • nausea,
  • stomach pain,
  • constipation,
  • problems with memory or concentration,
  • nervousness, or
  • restlessness or excitability (especially in children).

Dose for Chlor-Trimeton for adults and children 12 years of age and older: One tablet every 4 to 6 hours, not to exceed 6 tablets in 24 hours or as directed by a physician. Children 6 through 11 years: Half the adult dose every 4 to 6 hours, not to exceed 3 whole tablets in 24 hours. Children under 6: Consult a doctor. Some medications may interact with Chlor-Trimeton, including antidepressants, diuretics (water pills), glycopyrrolate, mepenzolate, aspirin or salicylates, atropine, belladonna, benztropine, dimenhydrinate, methscopolamine, scopolamine, bronchodilators, MAO inhibitors, bladder or urinary medications, or irritable bowel medications. Tell your doctor all drugs you are taking. Chlor-Trimeton is not expected to be harmful to a fetus. Tell your doctor if you are pregnant or plan to become pregnant during treatment. Chlor-Trimeton can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breastfeeding.

Our Chlor-Trimeton Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

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.

Chlor-Trimeton Consumer Information

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

Stop using chlorpheniramine and call your doctor at once if you have a serious side effect such as:

  • fast or uneven heart rate;
  • mood changes;
  • tremor, seizure (convulsions);
  • easy bruising or bleeding, unusual weakness;
  • feeling short of breath; or
  • urinating less than usual or not at all.

Less serious side effects may include:

  • dizziness, drowsiness;
  • dry mouth, nose, or throat;
  • constipation;
  • blurred vision; or
  • feeling nervous or restless.

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.

Read the entire detailed patient monograph for Chlor-Trimeton (Chlorpheniramine Maleate)

Chlor-Trimeton Professional Information


When using this product

  • excitability may occur, especially in children
  • drowsiness may occur
  • avoid alcoholic beverages
  • alcohol, sedatives and tranquilizers may increase drowsiness
  • use caution when driving a motor vehicle or operating machinery

If pregnant or breast-feeding, ask a health professional before use.

Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away.

Read the entire FDA prescribing information for Chlor-Trimeton (Chlorpheniramine Maleate)

Related Resources for Chlor-Trimeton

© Chlor-Trimeton Patient Information is supplied by Cerner Multum, Inc. and Chlor-Trimeton Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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