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Chlor-Trimeton Patient Information Including Side Effects

Brand Names: AHist, Aller-Chlor, Allergy Relief, C.P.M., Chlo-Amine, Chlor-Mal, Chlorphen, ChlorTan, Chlor-Trimeton, Chlor-Trimeton Allergy SR, Ed ChlorPed, Ed Chlor-Tan, PediaTan, TanaHist-PD, Triaminic Allergy, Wal-finate

Generic Name: chlorpheniramine (Pronunciation: KLOR fen IR a meen)

What is chlorpheniramine (Chlor-Trimeton)?

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

Chlorpheniramine is used to treat sneezing, itching, watery eyes, and runny nose caused by allergies or the common cold.

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

Chlor-Trimeton 8 mg

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What are the possible side effects of chlorpheniramine?

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

  • urinating less than usual or not at all;
  • confusion, extreme drowsiness;
  • severe dizziness, anxiety, restless feeling, nervousness; or
  • weak or shallow breathing.

Less serious side effects may include:

  • mild dizziness, drowsiness;
  • blurred vision;
  • dry mouth;
  • nausea, stomach pain, constipation;
  • problems with memory or concentration; 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. You may report side effects to FDA at 1-800-FDA-1088.

Read the Chlor-Trimeton (chlorpheniramine maleate) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about chlorpheniramine?

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Do not take chlorpheniramine if you are allergic to it.

Ask a doctor or pharmacist before taking chlorpheniramine if you have glaucoma, a stomach ulcer, severe constipation, kidney disease, urination problems, an enlarged prostate, or a thyroid disorder.

Ask a doctor or pharmacist before using any other cold, cough, or allergy medicine. Chlorpheniramine is contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains an antihistamine.

Chlorpheniramine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.

Drinking alcohol can increase certain side effects of chlorpheniramine.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Allergies & Asthma

Improve treatments & prevent attacks.