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Worm and parasite medicines

Tinidazole

Also sold as: Fasigyn

Prescription neededWorm and parasite medicines
Comes as:Tablet

Usual adult dose

Usual adult dose: 2 g as a single dose with food (giardia, trichomonas). Amoebic dysentery: 2 g once a day for 3 days. No alcohol during treatment and for 72 hours after.

Your doctor may give you a different dose. Children's doses depend on weight.

Side effects

Common

  • nausea
  • metallic taste
  • loss of appetite
  • headache

Serious — get help

Stop taking it and see a doctor straight away if you notice:

  • severe allergic reaction
  • numbness or tingling in hands and feet
  • seizures

Do not take it, or take care, if

  • Drinking alcohol during treatment and for 72 hours after
  • First 3 months of pregnancy
  • Breastfeeding (stop for 3 days after the dose)
  • Blood disorders or nerve disease

Interactions

Medicines that can react with this one.

Serious1 medicineDo not take these together unless your doctor says so.
  • Warfarin

    Tinidazole raises the effect of warfarin and the risk of bleeding; INR must be checked.

Moderate1 medicineTake together only with care. Ask your doctor or pharmacist.
  • Lithium carbonate

    Tinidazole can raise lithium levels.

Pregnancy

  1. A
  2. B
  3. C
  4. D
  5. X

Category C

A risk to the baby cannot be ruled out. Use only if your doctor says the benefit is greater than the risk.

Generic alternatives

Similar medicines your doctor or pharmacist may offer instead.

  • Metronidazole
Check with my other medicines

Always follow your doctor or pharmacistThis page is general information, not a prescription. Do not start, stop or change a medicine on your own.