Diphenhydramine (Benadryl)
$1.73
Benadryl (Diphenhydramine) is an antihistamine for allergy symptoms, itching and hives, and is also used as a short term sleep aid.
Drug Information
4 reviews for Diphenhydramine (Benadryl)
Benadryl contains Diphenhydramine.
Diphenhydramine is an older antihistamine. It relieves allergy symptoms, itching and hives, and because it causes drowsiness, it is also used as a short-term sleep aid.
What is it used for?
- Allergy symptoms like sneezing, runny nose and itchy eyes
- Itching and hives
- Short-term sleep problems
- Motion sickness
How does it work?
Diphenhydramine blocks histamine throughout the body and in the brain. This eases allergy symptoms and causes sleepiness.
This information is written in simple words to help you understand this product. It does not replace advice from your doctor or pharmacist.
Read these points before you start. If any of them apply to you, talk to your doctor or pharmacist first.
- Tell your doctor if you have kidney or liver problems.
- Tell your doctor if you are pregnant or breastfeeding.
- Some people still feel a little sleepy. Do not drive until you know how it affects you, and be careful with alcohol.
- It often causes drowsiness. Do not drive, and avoid alcohol.
- Tell your doctor if you have glaucoma, an enlarged prostate, asthma or trouble passing urine.
- Do not give it to children under 6 unless a doctor says so. Older people may become confused.
- Tell your doctor or pharmacist about every other medicine, vitamin or herbal product you use.
- Keep this product out of the reach and sight of children.
Like all medicines, Benadryl can cause side effects, but not everybody gets them.
Common side effects
- Drowsiness
- Dry mouth
- Dizziness
- Blurred vision
These are usually mild and often get better as your body gets used to it. Tell your doctor if they bother you or do not go away.
Stop using it and get medical help straight away if you notice:
- Signs of a serious allergic reaction, such as swelling of the face, lips or throat, or trouble breathing
- A fast or uneven heartbeat
This is not a complete list. If you notice anything unusual, ask your doctor or pharmacist.
- For allergies, adults take 25 mg to 50 mg every 4 to 6 hours if needed. Do not take more than 300 mg a day.
- For sleep, take 50 mg about 30 minutes before bedtime.
- Swallow with water.
If you miss a dose: Take it as soon as you remember, unless it is nearly time for your next dose. Never take two doses at once.
If you use too much: Contact your doctor, a poison control centre or your local emergency number straight away, even if you feel fine. Take the pack with you.
How to store it: Keep it in its original pack at room temperature (below 25°C / 77°F), away from heat, damp and direct sunlight. Do not use it after the expiry date.
- QHow quickly does Benadryl work?
- A
Most people feel relief within 1 to 3 hours.
- QCan I take Benadryl every day?
- A
Yes. For hay fever or long-lasting hives, it can be taken every day during the season or for as long as needed.
- QCan I drink alcohol with Benadryl?
- A
It is best to limit alcohol. Together they can make you more drowsy, even with antihistamines that do not usually cause sleepiness.

Neel Herrera –
First time ordering here and it was a pleasant surprise. I had no issues with what I received. For the price, I could not ask for more. I should add that navigation is simple, even for someone who is not great with websites. Happy with the experience overall.
Mina Thomas –
I just received my order and wanted to leave a quick note. Delivery was quicker than I thought it would be. I checked everything against my order and it was all correct. It was affordable and the total at checkout matched what I expected.
Ibrahim Adams –
I went looking for Diphenhydramine and ended up ordering it here. What arrived was just as listed on the site. I got a helpful reply when I asked about my order. Five stars from me.
Ming Hill –
My Benadryl matched the description on the page. Shipping updates were clear, and the parcel turned up when promised.