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Trimethoprim 200mg Tablets
  • Trimethoprim 200mg Tablets

Trimethoprim 200mg - 6 Tablets

From £9.99

Medication features

  • Used to treat bacteria that cause infections primarily urinary and respiratory tract infections
  • Can also be used for prevention of recurrent urinary infections
  • Twice daily dosage
  • Three day course
  • NOT to be used in pregnancy
Note: Packaging/Manufacturer may vary


Cystitis Doctor Service

Trimethoprim Tablets 200mg Tablets belong to a group of medicines known as antibacterials. They are used to kill a wide range of bacteria that cause infections in your body, primarily urinary and respiratory tract infections.

This medicine can also be used for prevention of recurrent Urinary Tract Infections (UTIs).

Trimethoprim Tablets contain the active substance trimethoprim.

About Trimethoprim
Trimethoprim tablets for urinary tract infections are an effective treatment for simple UTIs. It is the most commonly prescribed antibiotic by GPS for the treatment of simple urinary infections. This medication contains 200mg of the active ingredient Trimethoprim which works to kill the bacteria which causes the infection.

Trimethoprim Alternatives
Aside from Trimethoprim, there are a number of other antibiotics which are used in the treatment of UTIs. Macrobid (nitrofurantoin), is also available via the online doctor service.

Apart from antibiotic treatments, there are a number of home remedies for cystitis. These can help relieve the symptoms associated with cystitis like stinging upon urination.


Can I Take Trimethoprim When Pregnant?

No. Trimethoprim can be harmful to the baby, particularly in the first trimester of pregnancy.

I Have Taken Trimethoprim & Developed A Mild Rash, What Should I Do?

Try applying a mild, fragrance-free moisturiser. If the rash worsens, spreads or is causing irritation speak to your doctor.

Do I Take Trimethoprim With Food?

With Trimethoprim it doesn’t matter if you take it with or without food.

My Infection Has Cleared After Taking Trimethoprim For One Day, Should I Stop Taking It?

No, ensure you complete the full course to prevent relapse of your infection.

Side Effects

Like all medicines Trimethoprim can cause side effects, although not everybody gets them.

While side effects are usually uncommon and mild in nature, it is best to be aware of any that may occur.

  • Some of the side effects associated with Trimethoprim are nausea and mild itchy rash.
  • Rare serious allergic reactions have occurred known as anaphylactic or anaphylactoid reactions.

STOP taking Trimethoprim Tablets and contact your doctor or go to your nearest hospital casualty department IMMEDIATELY if you notice any of the following symptoms:

  • difficulty breathing
  • swelling of the face, lips, tongue and throat
  • chest pain
  • shock, fainting or collapse
  • blistering/peeling of the skin
  • pancreatitis (signs may include a sudden, severe upper abdominal pain)
  • skin eruptions/lesions
  • deep swelling of the skin (angioedema)
  • jaundice (yellowing of the skin or whites of the eyes)
  • elevation of serum transaminases (an indication of liver damage)
  • elevation of bilirubin levels

For a full list of side effects, read the Patient Information Leaflet.

If you get any side effects, talk to your doctor, our Rightdose pharmacists or nurse. This includes any possible side effects not listed in this leaflet.

You can help to make medicines safer by reporting any side-effects to the Yellow Card Scheme at www.mhra.gov.uk/yellowcard.


Info Leaflet

Before taking any medication, it is important to read the Patient Information Leaflet. You can find information leaflets for your medicines by typing them into the search bar at medicines.org.uk., or by contacting us.

Patient Information Leaflet Trimethoprim Tablets 200mg

Pregnancy and breast-feeding

If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine. Trimethoprim should not be used in pregnancy. DO NOT take Trimethoprim Tablets if you are pregnant.

If you are breast-feeding, ask your doctor or pharmacist for advice before taking this medicine.

Driving and using machines

There is no evidence to suggest that Trimethoprim Tablets affect the ability to drive or operate machinery.
Important information about some of the ingredients of Trimethoprim Tablets

These tablets contain a sugar called lactose.

If your doctor has told you that you have an intolerance to some sugars, contact your doctor before taking this medicinal product.

How to store Trimethoprim tablets

Keep this medicine out of the sight and reach of children.

  • Do not use Trimethoprim Tablets after the ‘expiry date’ printed on the pack. The expiry date refers to the last day of that month.
  • Store your tablets below 25ºC (room temperature) in a dry place and protect from light. Keep it in the pack in which it was given to you.
  • Do not transfer your tablets to another container. Return any leftover tablets to your pharmacist, unless your doctor tells you to keep them.
  • Medicines should not be disposed of via wastewater or household waste. Ask your pharmacist how to dispose of medicines no longer required. These measures will help to protect the environment.


Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure. They can be swallowed with a glass of water, but not chewed, at the same time each day.

  • For urinary tract infections, the most common length of course is 3 days.
  • For more stubborn infections, it may also be prescribed for five days.
  • One tablet is taken twice daily.

Even if symptoms dissipate before completing your course, you should make sure to finish the tablets prescribed. This is to make sure the infection has been completely defeated, to reduce the risk of it coming back.


Adults and children over 12 years
Severe or sudden infections: usually your doctor will prescribe 200mg taken twice daily.
Long term treatment and prevention therapy: 100mg at night

Dosage is dependent on kidney function. Elderly patients with kidney problems will usually be prescribed a
reduced dose.

Children aged 6 – 12 years
Severe or sudden infections: 100mg twice daily
Long term treatment and prevention therapy: 50mg at night. The usual dose is around 2mg/kg body weight of the child per day.

If you take more of your medicine than you should: If you (your child or someone else) take too many tablets, tell a doctor or pharmacist or go to the nearest hospital casualty department straight away. Remember to take this leaflet and the tablet packaging with you.

If you forget to take your medicine: If you do forget to take a dose of your medicine at the correct time, take
it as soon as you remember, then take the next dose at the right time.

  • DO NOT take a double dose.

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 this medicine, your condition may reoccur or get worse. If you experience symptoms on stopping treatment, contact your doctor.



DO NOT take Trimethoprim Tablets if you:

  • are allergic (hypersensitive) to trimethoprim or to any of the other ingredients
  • are pregnant
  • suffer from severe liver problems
  • suffer from any blood disorders such as anaemia

Trimethoprim should not be administered to premature babies or infants under 4 months of age.

The tablet form is NOT recommended for use in children under 6 years

  • the oral liquid form should be used.

Warnings and precautions

Talk to your doctor or pharmacist before taking Trimethoprim Tablets if you:

  • are pregnant
  • suffer from kidney problems/kidney disease or are having dialysis treatment
  • have a deficiency (are low) in folic acid (may cause anaemia)
  • are at greater risk of high levels of potassium in your blood (hyperkalaemia), e.g. the elderly or those on higher doses
  • are also taking repaglinide (medicine for treating diabetes)
  • suffer from porphyria (a disorder that causes skin sensitivity to light, pain attacks and muscle weakness)
  • Trimethoprim should not be given to premature babies or babies during the first few weeks of life.

You should let your doctor know and ask his/her advice if you suffer from or have ever had any of the above.

Trimethoprim can increase potassium blood levels. Patients at risk of increased potassium blood levels include those with kidney problems, poorly controlled diabetes, or those on certain medicines or potassium supplements. The symptoms of severe hyperkalaemia might include muscle cramps, irregular heart rhythm, diarrhoea, nausea, dizziness or headache. Your doctor may perform blood tests to monitor your potassium blood levels.

Your doctor may wish to do regular blood tests if you need long-term treatment or are prone to anaemia.


Trimethoprim Tablets are available in two strengths, 100mg and 200mg.


The active ingredient is trimethoprim, which is an antibiotic.

Other ingredients are lactose monohydrate, povidone K30, crospovidone, sodium starch glycolate Type A and magnesium stearate.

What Trimethoprim Tablets look like and contents of the pack
Trimethoprim 100mg tablets are available in pack sizes of 28, 100 and 500.

The tablets are flat, white tablets and contain the marking TR100. Trimethoprim 200mg Tablets are available in pack sizes of 6, 14, 100 and 500. The tablets are flat, white tablets and contain the marking TR200.

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