Patient info

Campral EC – patient leaflet, side effects, dosage

Updated:
Key facts
Status:
Prescription only (POM)
Medicine strength:
333 mg
Contains active substance:

Patient leaflet - Campral EC

1) What Campral tablets are and what they are used for

Campral is a medicine which acts on the central nervous system (the brain and the spinal cord).

Campral helps people who are dependent on alcohol to abstain from drinking alcoholic drinks. Campral in combination with counselling will help you not to drink alcohol. It does this by acting on the chemical changes that have taken place in the brain during the years that you have been drinking alcohol. It does not prevent the harmful effects of continuous alcohol abuse.

2) What you need to know before you take Campral tablets

Do not take Campral tablets:

  • if you have had an allergic reaction, skin rash, swelling of the face, wheezing or difficulty breathing after taking acamprosate (INN) calcium or any of the other ingredients of Campral (see list of ingredients in section 6) in the past
  • if you are pregnant or breast-feeding
  • if you suffer from severe kidney disease
  • if you suffer from severe liver disease

Warnings and precautions

Tell your doctor or pharmacist before taking Campral tablets.

You should not be drinking when you start Campral treatment. Campral will be less effective if you keep drinking.

If you drink too much alcohol, your body system and in particular your nervous system adapt to the effects of alcohol. When you then suddenly stop drinking you may experience some unpleasant symptoms known as alcohol withdrawal syndrome, which can last up to two weeks.

You should take Campral tablets as soon as possible after the withdrawal period.

Because patients who suffer from alcohol dependence often also suffer from depression it is recommended that you be monitored for symptoms of depression.

This medicine is not recommended for children or elderly.

Other medicines and Campral tablets

Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines.

Campral has often been given to patients together with other medicines that are used to treat alcohol withdrawal or maintain abstinence. So far, Campral does not seem to interfere with the effects of other medicines, however if you are prescribed diuretics (water tablets) consult your doctor.

Campral tablets with alcohol

Drinking alcohol while taking Campral does not make you feel sick, however do not drink alcohol at all during your treatment with Campral. Even if you drink a small amount of alcohol you run the risk of making your treatment fail and you may end up drinking heavily again.

Pregnancy and breast-feeding

If you are pregnant, think you might be pregnant, or planning to become pregnant, you should not take Campral tablets without consulting your doctor first.

If you are breastfeeding, you should not take Campral tablets.

Driving and using machines

Campral does not make you sleepy and therefore is not expected to affect your ability to drive or use machines.

Information about sodium content

This medicine contains less than 1mmol sodium (23mg) per

dosage unit, that is to say it is essentially ‘sodium free’.

3) How to take Campral tablets

Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.

If you weigh 60 kg or more:

The usual dose is 6 tablets a day: 2 tablets in the morning, 2 tablets at noon and 2 tablets in the evening with meals.

If you weigh less than 60 kg

The usual dose is 4 tablets a day: 2 in the morning, 1 at noon and 1 in the evening with meals.

Read all of this leaflet carefully before you start taking this medicine because it contains important information for you.

  • Keep this leaflet. You may need to read it again.
  • If you have any further questions, ask your doctor or pharmacist or nurse.
  • This medicine has been prescribed for you only. Do not pass it on to others. It may harm them, even if their signs of illness are the same as yours.
  • If you get any side effects, talk to your doctor or pharmacist or nurse. This includes any possible side effects not listed in this leaflet. See section 4.

Duration of treatment:

It is recommended that you keep taking Campral for one year.

If you take more Campral tablets than you should

If you take too many tablets, call your doctor or hospital casualty department immediately. You may experience diarrhoea and have raised blood calcium levels.

If you forget to take Campral tablets

Do not take a double dose to make up for a forgotten dose.

If you forget to take a dose take it as soon as you remember it and then take the next dose at the right time.

If you stop taking Campral tablets

Talk to your doctor before you stop taking the tablets and follow their advice.

If you have any further questions on the use of this medicine, ask your doctor or pharmacist.

4) Possible side effects

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

If you experience any of the following side effects with Campral tablets, STOP taking the tablets and contact your doctor immediately: A severe allergic reaction, such as angio-oedema (causing large raised marks on the skin and localised swelling, including the face and throat) or anaphylaxis (causing difficulty in breathing with rash, swelling, wheezing and feeling faint).

The following side-effects have been reported:

Very common: may affect more than 1 in 10 people

  • diarrhoea

Common: may affect up to 1 in 10 people

  • stomach ache
  • gas
  • feeling sick
  • vomiting
  • itchy or spotty skin rash
  • decreased sexual desire
  • impotence
  • frigidity

Uncommon: may affect up to 1 in 100 people

  • increased sexual desire

Not Known: frequency cannot be estimated from the available data

  • allergic reactions including hives, angio-oedema and anaphylaxis (see the beginning of this section)
  • blistering rash characterised by patches of skin filled with fluid

    Reporting side effects

    If you get any side effects, talk to your doctor or pharmacist or nurse. This includes any possible side effects not listed in this leaflet.

    You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.

    By reporting side effects you can help provide more information on the safety of this medicine.

5) How to store Campral tablets

  • Keep out of the sight and reach of children.
  • Do not store above 25°C.
  • Do not take Campral tablets after the expiry date which is stated on the carton and blister label after EXP. The expiry date refers to the last day of that month.
  • Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help protect the environment.

6) Further information

What Campral tablets contain

The active substance is acamprosate calcium. Each gastro-resistant tablet contains 333mg acamprosate calcium.

The other ingredients are: crospovidone, microcrystalline cellulose, magnesium silicate, sodium starch glycolate, anhydrous colloidal silica, magnesium stearate, eudragit L30D, talc, propylene glycol.

What Campral tablets look like and contents of the pack

Campral tablets are white, round and biconvex, marked with ‘333’ on one side and plain on the other.

They come in blister packs containing 84 and 168 tablets.

PL 46420/0193 Campral EC POM

Who makes and repackages your medicine?

Your medicine is manufactured by Merck Santé S.A.S., Centre de production, 2, rue du Pressoir Vert, 45400 SEMOY France

or

Merck SL, Poligono Merck Mollet Del Vallès, 08100 Barcelona, Spain.

Procured from within the EU and repackaged by the Product Licence holder: Suerte Pharma Ltd, 4/5 Northolt Trading Estate, Belvue Road, Northolt, Middlesex, UB5 5QS.

Leaflet date: 19.03.2021

Campral is a registered trademark of Merck Sante, France.

Blind or partially sighted?

Is this leaflet hard to see or read?

Call 020 8839 3000 to obtain the leaflet in a format suitable for you.

About this document

Source: MHRA - Medicines and Healthcare products Regulatory Agency (products.mhra.gov.uk) · Marketing authorisation: PLPI 46420/0193

Last revision stated in the text: 19 March 2021 · MHRA data as of 13 October 2026

Found a mistake? Tell us on the contact page.

The information on this site does not replace the advice of a doctor or pharmacist.

Facts about Campral EC

Prescription needed? Yes, prescription-only medicine (POM)
Active substance Acamprosate
Strength 333 mg
Pharmaceutical form Gastro-resistant tablet
Campral tablets are white and round with ‘333’ engraved on one side and approximately 10 mm in diameter.
How is it taken Oral
Excipients Crospovidone (KOLLIDON CL), Microcrystalline cellulose (AVICEL PH 101), Magnesium silicate (COMPRESSIL), Sodium starch glycolate (EXPLOTAB), Anhydrous colloidal silica (AEROSIL 200), Magnesium stearate, Anionic copolymer of metacrylic acid and acrylic acid ethyl ester (EUDRAGIT L 30 D), Talc, Propylene glycol
Pack sizes 168 tablet
Is it available? Listed as available (NHS Dictionary of Medicines and Devices – not a record of current supplies)
Shelf life 3 years.
Storage This medicinal product does not require any special storage conditions
Drug group (ATC)
  1. N Nervous system drugs
    1. N07 Other nervous system drugs
      1. N07B Drugs used in addictive disorders
        1. N07BB Drugs used in alcohol dependence
          1. N07BB03 acamprosate
Marketing authorisation PL 11648/0289 (first authorised 18 December 1995), PLPI 46420/0193
Marketing authorisation holder Merck Serono Limited
Codes GTIN 5013675000904 · BNF 04100100

Sources: the MHRA product information (products.mhra.gov.uk) and the NHS Dictionary of Medicines and Devices (dm+d), release 10.2.0 of 19 October 2026, NHS Business Services Authority. Contains public sector information licensed under the Open Government Licence v3.0.