How does chlorphenamine work?
Chlorphenamine prevents histamine from triggering allergy symptoms, such as sneezing, runny nose, and skin irritation.
What is chlorphenamine used to treat?
Chlorphenamine is commonly used for:
- Hay fever (seasonal allergic rhinitis)
- Hives (urticaria)
- Skin allergies and insect bites
- Allergic reactions to food or medicines
- Cold and flu symptoms (as part of some combination medicines)
Who can take chlorphenamine?
Chlorphenamine is suitable for most adults and children over 6 years old.
Who might not be able to take chlorphenamine?
Chlorphenamine may not be suitable if you:
- Have glaucoma
- Have severe kidney or liver disease
- Have epilepsy
- Have difficulty urinating due to an enlarged prostate
- Are taking other medications that cause drowsiness
Can I take chlorphenamine if I’m pregnant or breastfeeding?
Chlorphenamine isn’t usually recommended during pregnancy or breastfeeding unless advised by a doctor.
What if I miss a dose?
If you forget a dose, take it as soon as you remember. If it’s close to your next dose, skip the missed one—do not take two doses at once.
How effective is chlorphenamine?
Chlorphenamine is highly effective at relieving allergy symptoms, usually working within 30 minutes to 1 hour.
What should I do if I take too much?
Taking too much chlorphenamine may cause severe drowsiness, dizziness, or confusion. If you feel unwell, seek medical help immediately.
What dose of chlorphenamine is usually taken?
- For adults and children over 12: 4mg every 4 to 6 hours (maximum 24mg daily)
- For children aged 6-12: 2mg every 4 to 6 hours (maximum 12mg daily)
Powered by pharmacies
With over 1,700 pharmacy partners across the UK, you can get the help you need, wherever you are based.
Our website and mobile app make it easy and convenient to manage your health needs and book services at a pharmacy nearby.
What are the side effects of chlorphenamine?
Common side effects include:
- Drowsiness or dizziness
- Dry mouth
- Blurred vision
- Nausea
- Headache
Serious side effects, such as difficulty breathing or severe allergic reactions, require urgent medical attention.
How should I take chlorphenamine?
Chlorphenamine is taken as tablets, liquid, or injections (in hospital settings). Tablets should be swallowed whole with water.
When should chlorphenamine be taken?
Chlorphenamine can be taken as needed for allergy relief but may be taken regularly for ongoing allergies.
What are the brand names for chlorphenamine?
Chlorphenamine is available as a generic medicine, but some branded versions include:
- Piriton
Final thoughts
Chlorphenamine is an effective antihistamine for allergies, but it can cause drowsiness. To get the best results, take it as directed, and avoid alcohol if it makes you sleepy. If symptoms persist, speak to your doctor or pharmacist.
