1. How quickly does Benadryl work?
Most people feel relief within 15–30 minutes.
What are Benadryl Allergy Relief Capsules?
Benadryl Allergy Relief is an antihistamine used to relieve common allergy symptoms such as sneezing, a runny or itchy nose, watery eyes, and itching.
It can help with allergies caused by:
- Hay fever
- Pet allergies
- House dust mites
- Other environmental allergens
It works by blocking histamine, the natural chemical your body releases during an allergic reaction.
Active ingredient:
Acrivastine – a fast-acting antihistamine
Who can take Benadryl (Acrivastine)?
- Adults
- Children aged 12 to 65 years
This medication is not recommended for:
- Children under 12 years
- Adults over 65 years
- Anyone allergic to acrivastine, triprolidine, or any ingredient in the capsules
- People with severe kidney disease
Speak to a pharmacist or doctor before use if you have kidney problems, are pregnant or breastfeeding, or take other medicines.
How to take Benadryl Allergy Capsules
Typical use:
Adults and children aged 12–65 years old:
Take one capsule every 4–6 hours if needed.
- Do not take more than 3 capsules in 24 hours
- Swallow whole with water
- Can be taken with or without food
If you miss a dose
This medicine is taken as needed. Do not take more than the maximum daily amount.
If you take too much
Seek medical advice immediately.
How to store Benadryl
- Store below 30°C
- Keep in the original packaging
- Protect from moisture
- Keep out of sight and reach of children
- Do not use after the expiry date
Like all medicines, side effects can occur, although not everyone gets them.
Common side effects
- Drowsiness
- Dry mouth
- Dizziness
Stop taking the medicine and seek urgent medical help if you notice:
- Swelling of the face, lips, tongue, or throat
- Difficulty breathing or swallowing
Important information:
- This medicine may cause drowsiness. If affected, do not drive or operate machinery.
- Avoid alcohol, as it may increase drowsiness.
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Frequently Asked Questions
2. Will it make me sleepy?
It can cause mild drowsiness in some people.
3. Can I take it with food?
Yes, it can be taken with or without food.
4. Can I take Benadryl during pregnancy or breastfeeding?
Speak to a doctor or pharmacist before use.
5. Can I take this antihistamine with other medicines?
Tell your pharmacist if you are taking other medicines, especially other antihistamines.
Our Clinical Authors
This page has been written by a registered UK pharmacist and reviewed by our clinical team to ensure it is accurate, clear and reflects current clinical guidance.
Last medically reviewed: 06 July 2026
Last updated: 06 July 2026