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Chlorphenamine is a drowsy antihistamine that relieves allergy symptoms, such as hay fever, hives and insect bite reactions.
What should I know about Chlorphenamine?
If you bought it without a prescription, do not take it for more than 2 weeks. Speak to a doctor if symptoms continue.
What are the side effects?
Sleepiness, dizziness, nausea, poor concentration, dry mouth, headaches and blurred vision can occur. Do not drive if affected, and avoid alcohol.
Who should check first?
Ask a pharmacist before giving it to a child, or if you take other medicines. It is sometimes combined with other ingredients in cough and cold products, so check labels.
When should I get help?
See a doctor if symptoms continue. Call your local emergency number (000 in Australia) for swelling of the throat or tongue, or trouble breathing.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency. Outside Australia, use your local emergency number.
Source: NHS: About chlorphenamine. General education does not replace individual medical advice. Updated November 2026.
Explore our health guides and medicine FAQs. Medicine availability and product instructions vary by country; follow the leaflet supplied with your medicine.