HomeUrinary Tract InfectionsCystitisAntibioticsTrimethoprim


What is Trimethoprim?

Trimethoprim is a type of antibiotic used to treat urinary tract infections. It is also used to prevent respiratory tract infections. Trimethoprim is also sold under the brand name Monotrim. Trimethoprim works by killing the bacteria that are causing an infection or stopping their growth so that they eventually die.

Can I Buy Trimethoprim Online?

The Online Clinic will prescribe Trimethoprim as a treatment for Urinary Tract Infections (such as Cystitis) where appropriate. Please complete the free consultation form that will be reviewed by one of our registered doctors.

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Trimethoprim Side Effects

Like any medication, Trimethoprim can have side effects. These are generally mild and improve as your body adjusts to the medication. Less than 1 in 10 people taking this medication will experience the most common side effects. These include:

  • Feeling sick or vomiting
  • An itchy, mild skin rash
  • Increased skin sensitivity to sunlight

If you do experience these side effects, there are certain measures that you can take to reduce them. If you are nauseous, eat little and often and try to avoid rich foods. If you develop a skin rash, apply a gentle, fragrance-free moisturiser and avoid scrubbing your skin. You should also apply a sunscreen, avoid bright sunlight and not use sun beds while taking Trimethoprim.

If you develop:

  • An allergic reaction (such as swelling of the mouth or face)
  • A severe skin rash with blisters
  • A high temperature with sore throat, mouth ulcers or unusual bruising/bleeding
  • Headache, stiff neck, tiredness and an increased sensitivity to bright light

speak to your doctor immediately or go to your local Accident and Emergency department.

Trimethoprim Contraindications

Trimethoprim is not suitable for everyone and it should be used with special caution in some cases. Trimethoprim is not suitable during pregnancy or by those who have a blood disorder or severe kidney disease. You should also make sure your doctor is aware if you are taking antibiotics or any other medications as there could be an interaction that causes you harm.

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Reviewed by: Dr Loraine Haslam MBBS, DRCOG, DFSRH, LoC SDI, LoC IUT, MRCGP
GMC registration number: 4524038
Date: 21 September 2022
Next review: 20 September 2024
All UK registered doctors can have their registration checked on
The Medical Register at the GMC website.

Information Leaflet

Source and further information

Trimethoprim Reviews By Our Patients

  • Overall Rating
    Based on 1 review
  • ★★★★★
    works straight away
    M. O. - 31/08/22
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