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Cimetidine Tablet 400mg

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£0.13
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Delivery information Product #0012199

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Cimetidine Tablet 400mg is a private prescription item. To purchase this item you must have a private prescription from your doctor or medical profession.

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  • Send your prescription

    Post your prescription via recorded delivery to ChemistDirect.co.uk, Prescriptions Department, Unit 1A, Junction 2 Industrial Estate, Demuth Way, Oldbury, West Midlands, B69 4LT, United Kingdom. At which point your order will be dispatched.

Cimetidine Tablet 400mg works by reducing the amount of acid in your stomach. It is used to treat gastrointestinal ulcers and to relieve heartburn and indigestion. In some cases, however, heartburn, indigestion and other similar symptoms may not be due to ulcers, but to other, more serious conditions. In such cases using Cimetidine could lead to a delay in the diagnosis of a more serious condition.

Do not share your medicine with other people. It may not be suitable for them and may harm them.

The pharmacy label on your medicine tells you how much medicine you should take. It also tells you how often you should take your medicine. This is the dose that you and your prescriber have agreed you should take. You should not change the dose of your medicine unless you are told to do so by your prescriber.

If you feel that the medicine is making you unwell or you do not think it is working, then talk to your prescriber.

Follow your doctor’s instructions. The pharmacist’s label on your medicine should tell you how much to take and how often. If it does not or you are not sure ask your doctor or pharmacist. The dose of your medicine you need to take and length of treatment will depend on the type and severity of your illness. Treatment is usually for a period of 4 to 8 weeks. Swallow your tablets with a drink of water.

Adults and older people

Stomach/intestinal ulcer:

  • 800mg daily taken as a single dose at bedtime or
  • 400mg at breakfast and at bedtime or
  • 200mg with each of the three meals and 400mg at bedtime (total 1000mg daily) or
  • 400mg with each of the three meals and 400mg at bedtime (total 1600mg daily)
  • Prevention of stomach/intestinal ulcer:
  • 400mg once daily at bedtime or
  • 400mg at breakfast and at bedtime

Zollinger-Ellison syndrome:

  • 400mg with each of the three meals and 400mg at bedtime (total 1600mg daily)

Oesophageal Reflux disease:

  • 400mg with each of the three meals and 400mg at bedtime (total 1600mg daily)
  • The maximum recommended dose of Cimetidine is 2400mg a day.

Children over 1 year of age

  • The dose should be taken as instructed by your doctor. A dose of 25-30mg per kg bodyweight per day
  • may be given in divided doses.
  • Cimetidine 800mg Tablets are not usually prescribed for children.

People with severe kidney problems:

  • The dose may be lowered if you have severe kidney problems as you may be more sensitive to the medicine.


Overdose: if you take more of your medicine than you should If you take an unintentional dose, it is unlikely to be harmful. If a large number of tablets are taken at the one time, drink plenty of water and contact your doctor or nearest hospital casualty department immediately.

  • If you forget to take your medicine
  • If you forget to take a dose of your medicine at the correct time, leave out that dose completely and
  • take the next dose when it is due.
  • If you stop taking your medicine
  • Keep taking this medicine until your doctor tells you to stop. Do not stop taking it just because you feel
  • better. If you stop taking the medicine, your condition may re-occur or get worse

DO NOT take Cimetidine if you:

  • Are pregnant or may be planning to become pregnant
  • Are breast-feeding
  • Have ever had an allergic reaction (for example, wheezing, runny nose, rash) after taking Cimetidine or any of the ingredients of Cimetidine Tablets


Before you take cimetidine tablets tell your doctor if:

  • You have a kidney or liver complaint
  • You have a low blood cell count
  • You have lost weight recently and also have stomach ache or pain or indigestion at the same time, particularly if you are over 40 years
  • Have had a stomach/duodenal ulcer in the past, particularly if you are regularly taking anti-inflammatories (NSAIDs) to treat arthritis. You should see your doctor regularly if this is the case.
  • If the answer is yes to any of the above, please tell your doctor


Taking other medicines:

Cimetidine Tablets may interfere with other medicines that you may be taking. If you are taking any of the following medicines, make sure that your doctor is aware of this:

  • Medicines to thin the blood (anticoagulants) e.g. warfarin
  • Medicines to prevent fits (anticonvulsants) e.g. phenytoin
  • Theophylline, a medicine to help breathing
  • Lidocaine (to slow heart rate) by intravenous injection
  • Procainamide, to treat irregular heart beats
  • Medicines that cause a fall in blood cell count
  • Non-steroidal anti-inflammatories (NSAIDs) e.g. Aspirin, indometacin
  • Medicines to help treat anxiety, e.g. Diazepam
  • Medicines to treat high blood pressure - e.g. Propranolol, Metoprolol, Diltiazem & Nifedipine
  • Antidepressants such as amitriptyline
  • Anti-diabetic medicines such as Glipizide, Metformin
  • Medicines used to prevent rejection of an organ following a transplant, e.g. ciclosporin and
  • tacrolimus.
  • Medicines used to treat fungal infections, e.g. Ketoconazole, itraconazole or posaconazole.
  • Atazanavir - used in the treatment of HIV
  • Medicines used in the treatment of cancer, e.g. carmustine, flourouracil, epirubicin or radiation therapy
  • Morphine - a powerful painkiller used to treat severe pain
  • You should also mention to your doctor or pharmacist any other medicines that you are taking, including any that you can buy without prescription.
  • If you go into hospital or to see a doctor or dentist, tell them you are taking Cimetidine Tablets.


Pregnancy and breast-feeding:

Unless you have recently discussed this with your doctor, please tell him or her if you are pregnant (or

think you may be), planning to become pregnant or are breast-feeding.

Driving and using machines:

Cimetidine tablets are unlikely to affect your ability to operate machinery or to drive. When you first start taking cimetidine, make sure your abilities are not affected before you drive or operate machinery

Important information about some of the ingredients of Cimetidine

  • The sodium content per tablet is:
  • 200mg tablet - 500micrograms
  • 400mg tablet - 1mg
  • 800mg tablet - 1.5mg
  • This is to be taken into consideration by patients on a controlled sodium diet.
Please contact your doctor or medical practitioner to understand more about the side effects of taking Cimetidine Tablet 400mg.
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