Sominex Tablets

89 reviews

From £5.19
Sominex Tablets

  • Free delivery over £40
  • 100% UK-based pharmacy
  • Free support and advice
  • We’re rated 4.9 out of 5

Buy Sominex Online

If you have been struggling to get a good night's sleep recently, Sominex tablets are an efficient sleeping aid that help you to drop off more quickly and slip into a relaxing deep sleep.

Sominex is available to buy online from The Independent Pharmacy, without a prescription. All you need to do is to complete our short online consultation so our pharmacy team can make sure Sominex is the best product for you.

  • Suitable for age:16 years +
  • Maximum per order:2

Sominex Information

  • What are Sominex tablets?

    Sominex tablets can be taken by adults and children over the age of 16 years for up to 7 days consecutively. They contain the active ingredient promethazine hydrochloride, which is an antihistamine that causes drowsiness.

    Sominex is effective as a sleeping aid to help combat short term sleep disturbance caused by changes to your normal routine making it difficult for you to fall asleep and to stay asleep.

    What is Sominex used for?

    Sominex is a sleep aid that primarily used to induce drowsiness in those that are suffering from short term sleep disturbances or insomnia.

    Taking Sominex around 20 minutes before you would normally go to bed, can help you to fall asleep more quickly and then stay asleep throughout the night.

    Sominex contains the antihistamine, promethazine, which like other antihistamines also helps to reduce symptoms of mild allergies such as itchy, watery eyes, itchy skin and runny noses.

    How does Sominex work?

    Sominex contains Promethazine, which is an antihistamine which has a sedative effect that causes drowsiness and aids sleep.

    Histamines are the chemicals that are produced by the body in response to something you are allergic to. Promethazine works by blocking histamine receptors in your brain which reduces the impact of an allergic reaction. It is this process that causes your brain and body to relax, making you feel tired and ready to sleep.

    Does Sominex work?

    To get the most benefit from taking Sominex you should take a tablet around 20 mins before you plan to go to bed or take a tablet up to 1 hour after going to bed if you are unable to fall asleep naturally.

    Sominex normally will take around 30 minutes to start to work and the effects can last up to 12 hours.

    You should only take Sominex for a maximum of 7 days. If you are continuing to be affected by sleeplessness after 7 days or are having repeated episodes you should speak to a pharmacist or doctor for advice.

    Sominex or Nytol

    Both Sominex and Nytol use different antihistamines that have a sedative effect to help induce sleep in people that are suffering short term sleep disturbances.

    Sominex contains the antihistamine promethazine whereas Nytol contains diphenhydramine. Both products work in the same way and may cause similar side effects. Some individuals may find that one of the products works better for them than the other.

    You can buy both Sominex and Nytol online at The Independent Pharmacy, without the need for a prescription. However if you are continuing to have difficulties getting a good night's sleep after a week you should speak to a pharmacist or doctor for advice.

    Is Sominex addictive?

    Sominex is unlikely to cause addiction, however it is only recommended that you take Sominex for up to 7 days. Although you are unlikely to become addicted to Sominex, you can become reliant on sleep aids for a good night's sleep. If you are relying on this product to help you sleep after 7 days you must speak to a pharmacist or doctor for advice.

    Sominex and alcohol

    You should not drink alcohol when taking Sominex as this significantly increases the likeliness of you experiencing side effects and can boost the severity if they do occur.


  • Sominex warnings

    Before taking Sominex please ensure that you have read and understood the warnings and precautions detailed in the Patient Information Leaflet.

    You should not take Sominex, without discussing with a pharmacist or doctor, if any of the following apply to you:

    • You have concussion, lightheadedness, drowsiness, dizziness or a recent head injury.
    • You are currently taking or have taken any other medication within the last two weeks.
    • You suffer from asthma or any other breathing problems.
    • You have ever experienced seizures.
    • You have concerns regarding your prostate.
    • You have problems with your kidneys, liver, heart or intestines.
    • Pregnancy tests based on urine samples, as they may give false positive or negative results if used when taking this medicine.

    Sominex in pregnancy & breastfeeding

    Taking Sominex at the same time as using urinary based pregnancy tests can cause false negatives or false positives.

    You should speak to a doctor or pharmacist for advice before taking Sominex if you are pregnant or breastfeeding and having difficulties sleeping.

    Sominex and driving

    Sominex causes drowsiness, you should therefore not drive or operate heavy machinery until you are sure that the effects have worn off and you do not feel drowsy.

    Sominex overdose

    You should not take more than 1 Sominex tablet per night. If you or someone you know have taken too many tablets, you need to contact your nearest emergency department or speak to a doctor straight away.

    For more information on recognising signs of an overdose, please read the Patient Information Leaflet.

  • Sominex dosage

    Adults and children over 16:

    • Take 1 tablet, 20 minutes before bedtime.
    • Or take 1 tablet one hour after going to bed if you can't go to sleep naturally.

    Only take Sominex for up to 7 days. If you are experiencing disturbances to your sleep after 7 days you must speak to a pharmacist or doctor for advice.

    Before you take Sominex tablets, please ensure that you have read the Patient Information Leaflet thoroughly.

    Sominex should only be taken orally and should not be taken by anyone under the age of 16 years.

  • Sominex ingredients

    Each Sominex tablet contains the active ingredient: promethazine hydrochloride 20mg.

    Each tablet also contains: lactose, maize starch, croscarmellose sodium, magnesium stearate.

    Please make sure you have read the Patient Information Leaflet thoroughly before taking Sominex for the full list of ingredients.

  • Sominex side effects

    The most common side effects people experience include:

    • Feeling tired during the daytime
    • Nightmares
    • Feeling dizzy
    • Difficulty concentrating
    • Headaches
    • Sunlight sensitivity

    Sominex, like other medication, can cause some people to experience unwanted side effects. For full details on reported side effects, please read the Patient Information Leaflet thoroughly.

    If you experience a severe allergic reaction as a result of taking Sominex please go straight to your nearest emergency department.

    If you are concerned about side effects or they do not improve once you have stopped taking Sominex you should speak to a pharmacist or doctor as soon as possible.

Sominex Tablets reviews

Related Treatments for Insomnia

Nytol Tablets (Original & One-A-Night)

from £3.99

We stock 1 other treatments for Insomnia

View more treatments

How it works

Find the ideal treatment for your condition
Complete a short online consultation
Your order will be delivered as soon as the next working day.

Need something else?

We stock 593 treatments for 72 conditions

Or browse all treatments or conditions

Medical professionals standing unified looking for solutions to fix your health problem