Hay Fever & Allergies

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  • Promethazine
  • Promethazine


Hay Fever & Allergies
  • Medication features

    Promethazine is a medicine that has a variety of uses. It can be used as an antihistamine (to control runny nose, sneezing, watering eyes etc.) but also for motion sickness and treatment before and after surgery. The antihistamine mode of action is straightforward as it prevents histamine from being produced in the body, which in turn controls the allergic response of the patient. As far as motion sickness and calming effect are concerned, the mode of action is not fully understood.

    • Treatment for allergies and motion-sickness
    • Drowsy type medication


NOTE: After selecting this product, you will need to complete a short assessment, so we can make sure this medication is suitable for you. Pricing is provided as a reference only. The final decision on issuing this medication remains with our Prescriber / Pharmacist.

Promethazine is an antihistamine which helps to reduce the symptoms of hay fever by blocking receptors in the body, which usually cause the symptoms of an allergic reaction.


  • Can I drink alcohol with this medication?

    Avoid drinking alcohol while taking promethazine- this can increase the risks of side effects.

  • How should I use this medication?

    Only take promethazine when you need it, such as relief for hay fever. Always use as directed.

  • How do I take this medication?

    Always take promethazine with a drink of water. Swallow them whole. Do not chew them.

  • What if I forget my medicine?

    Skip the missed dose and take your next dose at the usual time.

    Never take two doses at the same time. Never take an extra dose to make up for a forgotten one.

  • How long does it take to work?

    Symptoms should start to improve within 20 minutes. The medicine should work for around 4 to 6 hours.

  • How long can I take it for?

    You should only take promethazine for a short time unless advised by a healthcare professional.

Side Effects

There is always a risk of side effects with all medications. Some of these can be quite mild and can subside over time. Others are more serious and should be reported to your GP right away if you experience any side effects. Please contact a member of our team if you are concerned about any potential side effects that may occur when taking promethazine.

Common side effects include:

  • Blurred vision
  • Restlessness
  • Drowsiness or fatigue
  • Headache
  • Sleep disorders

There are some serious side effects that may occur when taking promethazine. You should stop taking the medication immediately and seek medical attention if you experien