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Tinidazole for infection

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Take tinidazole tablets with or straight after a meal. 

Keep taking the tablets until the course is finished, unless you are told to stop.

Do not drink alcohol while you are on tinidazole, or for three days afterwards.

Type of medicineAntimicrobial agent
Used forTo treat infection and before surgical operations to prevent infection
Also calledFasigyn®
Available asTablets

Tinidazole is used to treat infections caused by anaerobic bacteria or micro-organisms called protozoa. These types of organisms often cause infections in areas of the body such as the gums, pelvic cavity, and abdomen. Occasionally, it is also used to get rid of Helicobacter pylori (a bacterial infection often associated with stomach ulcers).

Tinidazole is given before gynaecological surgery and surgery on the intestines, to prevent infections from developing.

Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking tinidazole it is important that your doctor or pharmacist knows:

  • If you are pregnant, trying for a baby or breast-feeding.
  • If you drink a lot of alcohol.
  • If you have ever had a problem with your blood, or have a rare 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, such as herbal and complementary medicines.
  • If you have ever had an allergic reaction to a medicine.
  • Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The leaflet will give you more information about tinidazole and a full list of side-effects which you may experience from taking it.
  • Take the tablets exactly as your doctor has told you - the dose you are given will depend upon what type of infection you have. As a guide, a single dose of four tablets taken at the same time is sufficient for most vaginal or dental infections. For other bacterial infections you are likely to be asked to take either four tablets on the first day and then two tablets daily for a further five or six days, or four tablets a day for up to six days. If you are taking tinidazole because you have a stomach ulcer, the usual dose is one tablet twice a day for seven days. Your doctor will tell you which of these is the right dose for you and this will also be printed on the label of the pack to remind you.
  • Space your doses out evenly throughout the day, and keep taking the tablets until the course is finished unless you are told to stop. This is because your symptoms may return if you stop taking tinidazole before the end of the course.
  • Take each of your doses with a snack or just after eating a meal. Swallow the tablets whole - do not chew or break the tablets.
  • If you forget to take a dose, take it as soon as you remember (unless it is nearly time for your next dose, in which case leave out the missed dose). Do not take two doses together to make up for a forgotten dose.
  • Important: do not drink alcohol while you are on tinidazole and for three days after finishing your course of treatment. This is because drinking alcohol with tinidazole is likely to make you feel very sick and cause other unpleasant effects.
  • If you buy any medicines, check with a pharmacist that they are safe to take with tinidazole. Some cough and cold preparations contain alcohol and should not be taken with these tablets.
  • If you need to take tinidazole for longer than ten days, your doctor will want you to have some tests. Make sure you keep any appointments that your doctor gives to you.

Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. These usually improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following side-effects continue or become troublesome.

Common tinidazole side-effects
What can I do if I experience this?
Feeling or being sick, stomach upsetStick to simple foods - avoid hot or spicy meals
Changes in the way things taste, furred tongue, sore mouthAsk your pharmacist to recommend a suitable oral hygiene product such as a mouthwash
Lack of appetiteThis should soon pass, but in the meantime choose food that you usually enjoy

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

  • Keep all medicines out of the reach and sight of children.
  • Store in a cool, dry place, away from direct heat and light.

Never take more than the prescribed dose. If you suspect that you or someone else might have taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.

If you are having an operation or dental treatment, tell the person carrying out the treatment which medicines you are taking.

This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.

Never keep out-of-date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you.

If you have any questions about this medicine ask your pharmacist.

Further reading & references

  • Manufacturer's PIL, Fasigyn®; Pfizer Limited, The electronic Medicines Compendium. Dated December 2008.
  • British National Formulary; 63rd Edition (Mar 2012) British Medical Association and Royal Pharmaceutical Society of Great Britain, London

Disclaimer: This article is for information only and should not be used for the diagnosis or treatment of medical conditions. EMIS has used all reasonable care in compiling the information but make no warranty as to its accuracy. Consult a doctor or other health care professional for diagnosis and treatment of medical conditions. For details see our conditions.

Original Author:
Helen Allen
Current Version:
Peer Reviewer:
Dr Adrian Bonsall
Document ID:
3623 (v23)
Last Checked:
Next Review:
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