Sominex – 20 Tablets


  • One a night
  • Aids sleep
  • Increases sleep depth
  • Decreases time taken to fall asleep

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  • Genuine Medicine Approved by MHRA
  • Regulated NHS & Online Pharmacy
  • Free Delivery for orders above £30
  • Free Private Prescription included


What is Sominex and how does it work?

Sominex is an over-the-counter medication that aids sleep and treats insomnia. It 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. This medication contains promethazine hydrochloride, an antihistamine commonly used to treat allergies. As promethazine hydrochloride is known to cause drowsiness, it is most commonly for insomnia.

Does Sominex work?

Sominex has been shown to help people get to sleep quicker, fall into a deep sleep and stay asleep for longer, and feel noticeably more refreshed in the morning.

How do I take Sominex?

To get the most benefit from taking Sominex you should take one 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 of insomnia, you should speak to a pharmacist or doctor for advice.

Is Sominex suitable for me?

Suitable for adults, the elderly and children aged 16 years and over except those who are pregnant, breastfeeding, or children under 16. You should therefore consult your doctor if you are pregnant, breastfeeding, or have any underlying health issues.

Side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Most common side effects associated with Sominex include:

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

If you are concerned about any 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.

More information

For more information, please refer to the product patient information leaflet.