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What Sominex One-A-Night is and what it is used for?
Sominex One-A-Night is used to relieve temporary (short-term) sleeping difficulties.
The active ingredient is promethazine hydrochloride, an antihistamine that causes sleepiness or drowsiness. Temporary difficulties in getting a good night’s sleep can be caused by various problems such as stress, jet lag or personal problems such as bereavement. In sleep problems of this type, Sominex One-A-Night is ideal for those occasions when you cannot get to sleep because your natural routine is disturbed. For temporary (short-term) relief only. If symptoms persist, consult your doctor.
Do not take Sominex One-A-Night for more than 7 days without consulting your doctor.
How to use Sominex
Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
Take this medicine by mouth Adults, the elderly and children over 16
• The recommend dose is one tablet at bedtime.
• It may be taken up to one hour after going to bed when you can’t go to sleep.
• Do not use this medicine for more than 7 days in a row. If natural sleep does not return within 7 days or you have repeated bouts of sleeplessness talk to your doctor.
Use in children and adolescents
Do not give to children under 16 unless your doctor tells you to.
If you take more Sominex than you should If you accidentally take too many tablets, or you think a child may have swallowed any, contact your nearest hospital casualty department or tell your doctor immediately.
Take the pack with you to show which medicine you have swallowed.
What you need to know before you take Sominex
Do not use Sominex if you:
• are allergic to promethazine or any of the other ingredients of this medicine.
• have an allergy to Phenothiazine drugs (used to treat mental illness, severe nausea/vomiting or vertigo, e.g. lorpromazine, pericyazine).
• have concussion, light headedness, drowsiness, dizziness or a recent head injury.
• have taken MAOIs (monoamine oxidase inhibitors) for depression within the last two weeks.
• use this medicine for short term sleeping problems. It should not be used for more than 7 days without talking to your doctor.
Warnings and precautions
Talk to your doctor or pharmacist before taking Sominex if you have:
• Asthma.
• Breathing problems or bronchitis.
• Experienced or are being treated for seizures (e.g. epilepsy).
Sominex may affect the risk of seizure
• Difficulty passing urine.
• Glaucoma (raised pressure inside the eyeball).
• Prostate trouble.
• Kidney or liver problems.
• Heart problems.
• A blocked intestine.
Do not take
• If you are under 16 years old.
• If you are pregnant. See section 2.
• Do not drink alcohol when taking this medicine.
• Do not use for longer than 7 days (see section 3).
Read all of this leaflet carefully before you start taking this medicine, because if contains important information for you.
• Always take this medicine exactly as described in this leaflet or as your doctor or pharmacist has told you.
• Keep this leaflet. You may need to read it again.
• Ask your pharmacist if you need any more information or advice.
• If you get any of the side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. See section 4.
• You must talk to a doctor if you do not feel better or if you feel worse after 7 days.
Other medicines and Sominex
Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines.
• Other medicines which make you drowsy (e.g.sedatives or relaxants).
• MAOIs (monoamine oxidase inhibitors) for depression.
• Medicines which may give you a dry mouth or blurred vision (e.g. atropine or antidepressants).
• Medicines used to reduce/prevent seizures (e.g. in epilepsy)
Sominex may affect the risk of seizure.
• Strong pain killers (e.g. codeine, morphine or buprenorphine).
• Medicines treating mental illness (e.g. promazine, flupentixol or haloperidol).
• Pregnancy tests based on urine samples, as they may give false positive or negative results if used when taking this medicine.
• Allergy skin tests, as they may give false negative results. Sominex should not be taken during the 3 days before
the test.
Sominex with alcohol
Do not drink alcohol when taking Sominex.
Use in children and adolescents
Do not give to children under 16 unless your doctor tells you to.
Pregnant or breast-feeding
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or
pharmacist for advice before taking this medicine. Sominex should not be taken 2 weeks before birth.
You should not take Sominex if you are breast-feeding. This is because small amounts may pass into mothers’ milk.
This can be harmful to your baby. If you are breast-feeding or planning to breast-feed, talk to your doctor or pharmacist
before taking any medicine.
Driving and using machines
These tablets will cause drowsiness and you should not drive or operate machinery until the effects have worn off.
Sominex contains Lactose.
If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine.
Contents of the pack and other information
What Sominex contains
The active substance is: promethazine hydrochloride 20mg.
The other ingredients are: lactose, maize starch, croscarmellose sodium, magnesium stearate.
What Sominex looks like and contents of the pack. Sominex tablets are white flat tablets with bevelled edges and are embossed ‘S’ on one side. They are supplied in blister packs of 8 and 16 tablets.
Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Elderly people may be more susceptible to the side effects or confusion when taking this medicine.
Serious side effects
If you think you have any of the following side effects or symptoms, stop using this medicine immediately and see a doctor as soon as possible.
• Allergic reactions which cause difficulty in breathing, swelling of the mouth or skin, vomiting or stomach pain.
• Jaundice (yellowing of the skin and eyes).
• Palpitations or abnormal heart rhythm.
• Low blood pressure (dizziness and lightheadedness).
• Blurred or reduced vision or pain in the eye.
• Listlessness and lack of energy.
• Reduction of white blood cells and platelets in the blood, causing ulcers in the mouth and throat, high temperature and bruising easily.
• Convulsions.
Other possible side effects
If you notice these or any other side effect not included below, stop use and tell your doctor or pharmacist. They will tell you what to do.
• Drowsiness.
• Confusion
• Dizziness or headaches.
• Clumsiness or disorientation.
• Shaking and trembling.
• Stomach upsets or dry mouth.
• Difficulty in passing urine.
• Restlessness or excitation.
• Feeling or being sick
• Sensitivity to sunlight.
• Difficulty sleeping.
• Ringing in the ears.
• Blocked/stuffy nose.
• Rashes
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed here You can also report side effects directly via the Yellow Card Scheme at:
By reporting side effects you can help provide more information on the safety of this product.
Signs of an overdose include:
Loss of consciousness, dilated pupils, hot dry skin, feeling sleepy or drowsy, convulsions, involuntary movements, uneven heartbeat, heart failure, increased pressure in the skull causing painful eyes, changes in vision, a bad headache behind the eyes (hypertension), breathing difficulties, feeling or being sick, dry mouth and tongue, uncontrolled eye movements, flushing, fever, visual disturbances, mental disorder including illusions, hallucinations and disorientation, agitation, difficulty passing urine, blocked intestines, lung impairment.
Children may also experience excitation, involuntary movement of hands, face and tongue, moving unsteadily or stumbling and
hallucinations.
If you need more advice consult your doctor or pharmacist.
Keep all medicines out of the sight and reach of children.
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msmj1999 verified purchase –
I received very good service at what is a difficult time for online pharmacies. Thanks very much.