Phenergan

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Treat allergies, insomnia or travel sickness with this effective antihistamine.

Strength: 25mg

What is Phenergan?

Phenergan is a drowsy antihistamine medication that contains the active ingredient promethazine hydrochloride.

What is Phenergan used for?

Phenergan is used to treat a variety of different conditions, including:

  • Temporary sleeplessness in adults (insomnia)
  • Hay fever and other minor allergic reactions
  • Travel sickness, nausea and vomiting
  • Coughing and a runny nose

How does Phenergan work?

Histamine is a substance that the body releases when it detects something harmful, such as an infection. When histamines are released, your blood vessels expand and your skin swells, which helps to protect the body from infection.

For people with allergies, however, the body believes certain substances are harmful that aren’t to others, and releases histamine as a result. This causes the classic symptoms of allergic reactions, such as a skin redness, hives, itching and swelling.

Promethazine hydrochloride, the active ingredient in Phenergan, is an antihistamine. It blocks the effects of histamine, which reduces the symptoms of mild allergic reactions such as hay fever.

In addition to reducing the symptoms of hay fever, promethazine has a number of other effects. It makes you drowsy, which means it can be used to treat temporary difficulties sleeping. It also affects the area of the brain that controls vomiting, which means it can be used to treat feelings of sickness - especially while travelling.

How long does Phenergan take to work?

Phenergan acts quite quickly. You should begin to notice the effects of the treatment around 20 minutes after taking it.

How long does Phenergan last?

The effects of Phenergan can last between 12 and 24 hours.

How should I take Phenergan?

Adults should take one tablet daily, preferably at night.

You should only take Phenergan when you need it, for example when you’re struggling to sleep due to temporary anxiety or your hay fever symptoms.

Who can’t take Phenergan?

Most adults can take Phenergan on a temporary basis safely. However, it isn’t suitable for everyone. Tell your GP or a pharmacist before taking Phenergan if you:

  • Have had an allergic reaction to promethazine or any other medicine in the past
  • Have primary angle closure glaucoma
  • Have problems urinating or emptying your bladder
  • Have epilepsy or any other condition that causes seizures
  • Are intolerant of any sugars
  • Have an upcoming allergy test
  • Are unable to drink alcohol
  • Are trying to get pregnant

Does Phenergan cause any side effects?

Some people will experience mild side effects while taking Phenergan. They may include:

  • Daytime tiredness
  • Nightmares
  • Dizziness
  • Difficulty concentrating
  • Headaches

Phenergan sometimes makes your skin more sensitive to sunlight. Keep out of direct or strong sunlight and follow sun safety advice.

People aged 65 and above who take Phenergan may experience additional side effects. These include:

  • Confusion
  • Dry mouth
  • Blurred vision
  • Difficulty passing urine

In rare instances, Phenergan may cause more serious side effects. Stop taking Phenergan and seek immediate medical attention if you have:

  • Signs of liver problems, such as yellowing skin or whites of the eyes
  • Bruising or bleeding that’s worse than normal
  • Muscle stiffness, shaking, or unusual face or tongue movements
  • Signs of a serious allergic reaction, such as difficulty breathing, chest tightness, wheezing, a skin rash, or swelling of the mouth, face, lips, tongue or throat

How should I store Phenergan?

Phenergan should be stored in a dry, cool environment that does not exceed 25°C.

 Information Leaflet

Always read the patient information leaflet before commencing treatment.

Phenergan Reviews

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Based on 160 independent customer reviews taken by Feefo (see all Feefo Reviews), Google and Trustpilot (see all Trustpilot Reviews).

"Great service"

Product Review:

"Worked wonders for hay fever"

Service Review:

"Great service. Fast and trustworthy"


(read on Feefo)
"Great, quick service."

Product Review:

"Quick and efficient, easy to use website, unbranded discreet packaging."

Service Review:

"Great, quick and efficient service with a range of delivery options. Arrived ahead of schedule, in unbranded packaging. As a repeat customer I throughly recommend."

"Very fast service highly recommended"

Product Review:

"This product really helps me with the strong hay fever and allergies "

Service Review:

"Very fast service highly recommended"

"Quick service and friendly staff also…"

Product Review:

"Great product and arrived on time"

Service Review:

"Quick service and friendly staff also they notify you whey our order is ready"

"Quick and efficient service"

Product Review:

"Great for my insomnia. Just one pill ensures a good night's sleep."

Service Review:

"Quick and efficient service. Will definitely be using again."


(read on Feefo)
"Good service"

Product Review:

"I need because I itching and I comme out invites the product is very good at relieving the symptoms around this with delivery in 48hrs"

Service Review:

"Very good service in ordering and delivering products with points earned on the products you buy and for writing them a review"


(read on Feefo)
"Fast and efficient service"

Product Review:

"Bought for hay-fever but its also great for my insomnia. Would recommend"

Service Review:

"Never used this company before bit was very happy with their fast and efficient service. Will be placing another order!"


(read on Feefo)
"Will always bu mi products here as Itrust the service completely"

Product Review:

"This medication is such a great help to me especially during the summer months works better than anything iv tried before and you never let me run out"

Service Review:

"Great service and arrived on time"


(read on Feefo)
"💯 excellent service quick and efficient would definitelyrecommend"

Product Review:

"Helps with my travel sickness great product"

Service Review:

"Absolutely professional quick and efficient service
Won’t hesitate to use again"


(read on Feefo)
"prompt"

Product Review:

"i use phenergan for pet allergy as other anithistamines dont seem to
help as much"

Service Review:

"very efficent service provided items always in stock also delivery is very prompt"

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Discreet service

With our discreet packaging you can order in confidence.

We never use our brand name on bills, delivery papers or your bank statement.

All our packages are completely plain, without any details of what’s inside or who has sent it.

Estimated delivery

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£2.90 - Monday 22 August

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£3.95 - Monday 22 August

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£5.95 - Monday 22 August by 1pm

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£13.95 - Monday 22 August by 9am

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from £4.95 - Saturday 20 August

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