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  • Sominex Sleep Aid 20mg (Promethazine) - 16 Tablets
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Sominex Sleep Aid 20mg (Promethazine) - 16 Tablets

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Pharmacy medicines are sold at the professional discretion of our pharmacist. Please answer the following questions accurately to allow our pharmacist to check that this product is suitable for the intended user(s). All information provided will be treated confidentially and will only be available to pharmacy staff processing your order.

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Sominex Sleep Aid 20mg (Promethazine) - 16 Tablets


What are Sominex Sleeping Tablets?

Sominex Sleeping Tablets contain a commonly used antihistamine called Promethazine Hydrochloride, it works by blocking the normal actions of histamine, the chemical that stimulates arousal-promoting areas of the brain. This helps reduce alertness and promote that first drowsy stage of sleep, helping you to then drift off into a restful, deeper sleep.

In sleep problems of this type, Sominex has been shown to help sufferers to fall asleep faster, have a longer and deeper sleep, and to wake up feeling rested in the morning. Do not take Sominex for more than 2 weeks without consulting your doctor.

Sominex ingredients:each tablet contains Promethazine Hydrochloride 20 mg.

How should Sominex Sleeping Tablets be used?

Always take this medicine exactly as described by your doctor. The recommended dose for adults and children aged 16 years and over is 1-2 tablets with water 30 minutes before you go to bed. For oral use only, children should always be accompanied when using this product.

When should Sominex Sleeping Tablets be used?

If you are a bit tired of sleepless nights and looking for a temporary solution that helps you get to sleep, then Sominex could be right for you. If you are stressed from work or just everyday life, this product allows you to get some much-needed rest and well deserved shut eye. You should only take these sleeping pills when you are able to get a full night of sleep. This means that you should take the medication at least seven to eight hours before you need to wake up.

When should Sominex Sleeping Tablets not be used?

You should not take this medicine if you have ever had an allergic reaction to diphenhydramine hydrochloride or any of the other ingredients. Do not take Sominex Sleeping Tablets if you have an obstruction in your stomach or gut (for example, because of an ulcer).


Talk to your doctor or pharmacist before taking Sominex if you have asthma, bronchitis or Chronic Obstructive Pulmonary Disease (COPD). Also speak to your doctor if you have an enlarged prostate or urinary retention, if you have moderate to severe liver or kidney disease, if you have myasthenia gravis, epilepsy or seizure disorders. If your sleeping difficulties persist, talk to your doctor or pharmacist, Sominex may get less effective if you use it continuously

Do I need a prescription to order Sominex Sleeping Tablets?

You do not require a prescription to purchase Sominex Sleeping Tablets. However, you will be asked a number of medical questions to allow our pharmacist to check that the product is suitable for your needs.

Can I use Sominex Sleeping Tablets if I am pregnant or breastfeeding?

Talk to your doctor before taking Sominex if you are pregnant, trying to become pregnant or breast feeding.


Like all medicines, Sominex can have side effects, although not everybody gets them. The most common side effects are: tiredness, drowsiness, reduced attention, unsteadiness, dizziness or a dry mouth. Not known (frequency cannot be estimated from the available data) are allergic reactions (such as rash, shortness of breath and swelling), blurred vision, palpitations (feeling your heart beat) or irregular heartbeat. You may also experience muscle twitching, convulsions, headache or pins and needles.

If you have been told by your doctor that you have an intolerance to some sugars, ask your doctor before taking this medicine. Do not consume alcohol whilst taking Sominex Sleeping Tablets. Please Note: Image for illustration purpose only. Brand or product may vary.

Download Patient Information Leaflet (PIL)

Each tablet contains Promethazine Hydrochloride Ph.Eur.2mg. Also contains lactose.
Causes drowsiness. Do not drink or operate machinery. Avoid alcholic drink. Do not give to children under the age of 16. Keep out of the sight and reach of children.

Shipping Costs

Free UK Delivery on all orders over £30 - Delivery within 3-5 working days

Standard UK Delivery - £2.95 - Delivery within 3-5 working days


Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist 4 U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.


Returns Information

Customers can read our full returns policy by clicking here

Lying awake at night staring at the ceiling, tossing and turning, and counting more sheep than you ever thought you’d see in your life? You’re not alone.

Lots of people are up all night struggling with insomnia, so today we’re going to take a look at what insomnia is and why so many of us can’t seem to get those 8 hours of sleep we really need.

Our studies show that just 24% of people get the NHS recommended 7-8 hours sleep a night. With a range of factors keeping us up such as stress, partners, noise and caffeine - It’s time to switch up our sleeping habits, as not getting enough Z’s every night can alter our bodies’ much-needed nightly reboot and affect our brain’s capability to problem-solve. We surveyed 2,000 UK-based respondents on questions relating to their sleeping habits.

If you’ve ever lay in bed, staring at the ceiling, wondering why you can’t just fall asleep, and stressing over how many hours of potential sleep you have left until your alarm clock goes off, then you’ve probably considered taking sleeping tablets.

This is why we’re going to take a look at the different kinds of sleeping pills, which one could be the best for you, and why getting to sleep is not just as simple as taking a pill before bedtime.

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