NZ Formulary

Trimethoprim

try-meth-oh-prim

What does it do?

Trimethoprim is used to prevent and treat urine infections.

How should you take it?

Take trimethoprim regularly as directed with a glass of water. Keep taking it until the course is finished, even if you start to feel better.

What if you forget a dose?

Take the missed dose as soon as possible and continue as directed.

Can you take other medicines?

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Skin rash, skin peeling or blisters

Stop taking and see your doctor immediately

Severe headache, stiff neck, confusion, eyes sensitive to light

Increased risk of infection - symptoms may include: fever, chills, sore throat, aches and pains, tiredness, pain when peeing, mouth ulcers

Easy/unusual bruising or bleeding

Tell your doctor immediately

Stomach upset

Take with food

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you have liver, kidney or blood problems.
  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.