Alimemazine

Overview

Alimemazine is a type of antihistamine used to relieve lumpy and itchy allergic skin reactions called hives (urticaria). It is also used before surgical procedures to help keep young children calm.

When alimemazine is prescribed for a young child who is about to have an operation, it produces a sedative effect which helps the child feel relaxed. Alimemazine is not suitable for children under 2 years of age.

Alimemazine works by blocking a substance called histamine in the body. In some people, an excess of histamine is produced by exposure to substances such as pollen, pet fur, house dust or insect bites, and this causes allergic skin reactions.

By blocking histamine, alimemazine eases the itchiness and lumpiness of these reactions.

Common side effects of alimemazine include:

• Feeling sleepy or dizzy.

• Blurred vision.

• Dry mouth.

• Headache.

• Upset stomach.

• Feeling shaky or restless.

You will find a full list in the manufacturer's information leaflet supplied with your medicine.

The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.

If you experience any other symptoms which you think may be due to this medicine, speak with your doctor or pharmacist.

Before you start taking alimemazine it is important that your doctor or pharmacist knows:

• If you are pregnant, trying for a baby or breastfeeding.

• If you have a heart condition or blood vessel disease.

• If you have liver, kidney, or prostate problems.

• If you have any difficulties peeing or if you have been constipated for some time.

• If you have breathing problems.

• If you have any of the following: epilepsy, Parkinson's disease, depression, increased pressure in your eyes (glaucoma), or a condition called myasthenia gravis which causes muscle weakness.

• If you have ever had yellowing of your skin or of the whites of your eyes (jaundice) or a blood disorder.

• If you have low levels of thyroid hormone (hypothyroidism).

• If you have a tumour on your adrenal gland (phaeochromocytoma).

• If you have a rare inherited blood disorder called porphyria.

• If you are taking or using any other medicines. This includes any medicines you are taking which are available to buy without a prescription, as well as herbal and complementary medicines.

• If you have ever had an allergic reaction to another antihistamine, or to any other medicine.

• Read the leaflet before use. It contains important information about alimemazine and possible side effects.

• Take alimemazine exactly as prescribed:

  • Adults and children aged 12 years and over: 10 mg, 2-3 times a day. A lower dose may be recommended if you are over 65.

  • Children aged 5-11 years: 5 mg, 3-4 times a day.

  • Children aged 2-4 years: 2.5 mg, 3-4 times a day.

• Measure liquid medicine carefully. If giving alimemazine liquid to a child, use the measuring device provided and follow the dosing instructions on the bottle.

• Take with or without food. Swallow tablets with a drink of water if preferred.

• If you miss a dose, skip it. Take your next dose at the usual time. Do not take two doses together to make up for a missed dose.

• Alimemazine causes drowsiness. If you feel drowsy or sleepy, do not drive and do not use tools or machines.

• Do not drink alcohol while you are on alimemazine as it increases the chance you will feel sleepy.

• Alimemazine may cause your skin to become more sensitive than normal to sunlight. Use a sunscreen that protects against UVA light and has a sun protection factor (SPF) of at least 15, especially in strong sunlight or until you know how your skin reacts. Do not use sunbeds.

• If you buy any medicines, check with a pharmacist that they are suitable to take with alimemazine. This is because a number of other medicines can interfere with the way alimemazine works or can increase the risk of side effects.

• If you are having an operation or any dental treatment, tell the person carrying out the treatment that you are taking alimemazine.

• Keep all medicines out of the reach and sight of children.

• Store in a cool, dry place, away from direct heat and light.

How quickly does alimemazine work?

Alimemazine usually starts to work within 15-30 minutes, although it may take longer for some people to feel the full effect. If you are taking it for itching or an allergic skin reaction, you should notice an improvement in your symptoms shortly after taking a dose.

How long does alimemazine stay in your system?

The effects of alimemazine can last for several hours. Some people may continue to feel drowsy the following day, especially after higher doses.

Can I take alimemazine every day?

Take alimemazine exactly as prescribed by your doctor. It may be used daily for some allergic conditions, but the length of treatment will depend on your symptoms and medical history.

Can I take alimemazine with other antihistamines?

Do not take alimemazine with other antihistamines unless your doctor or pharmacist advises you to. Combining antihistamines may increase the risk of side effects such as drowsiness and dizziness.

Can I drink alcohol while taking alimemazine?

It is best to avoid alcohol while taking alimemazine. Alcohol can increase drowsiness and make side effects such as dizziness more likely.

Can I buy alimemazine over the counter?

No. In the UK, alimemazine is generally available on prescription and is not usually sold over the counter.