Trimethoprim is an antibiotic that provides effective treatment for water infections such as Cystitis. Take Trimethoprim tablets twice a day for effective bladder infection relief.


Order in the next: to receive your order Tuesday, 4th August
£ 10.99
In stock


What is Trimethoprim?

Trimethoprim is an antibiotic that is commonly used to provide effective treatment against Cystitis and other water infections. The tablets come in 200mg dosage and are typically prescribed in quantities of 6 tablets per pack. Trimethoprim should help to ease the painful symptoms of cystitis and other water infections within a few days of usage.

Trimethoprim 200mg tablets are a prescription drug and can only be purchased with a valid UK doctor’s prescription. The general dosage of Trimethoprim is 200mg, Medicine Direct do not sell any higher dosage than the ones stated.

What is Trimethoprim used to treat?

Trimethoprim is widely used to treat UTI’s (Urinary Tract Infections) particularly Cystitis. It can also be used to treat of infections such as chest infections and can even treat acne to some aspects.

Trimethoprim is usually taken twice a day to treat infections and in most cases you will start to feel an improvement in your symptoms within a couple of days.

Trimethoprim dose

Trimethoprim is available as a 200mg dosage and come in tablet form. The recommended daily dose for trimethoprim is 1 x 200mg tablets twice a day to treat water infections such as cystitis. Trimethoprim can also be used to treat other infections such as acne, if you are taking trimethoprim as a treatment for acne; the recommended daily dose is 300mg twice a day.

If you are taking trimethoprim as a means to prevent water infections and cystitis the recommended daily dosage is 100mg once a day. Trimethoprim tablets come in a packet of 6 tablets, as this is usually all that is needed to treat water infections such as cystitis, after completing your course, the symptoms and pain experienced during a water infection should subside. If you are still experiencing cystitis even after your course we would recommend contacting your GP for further advice and guidance.

Trimethoprim dosages are usually lower when taken by elderly patients.

How long does Trimethoprim take to work?

Trimethoprim is a fast acting antibiotic used to treat urine and kidney infections such as cystitis. The length of time that this medication takes to start working depends on a number of factors such as:

  • How bad your infection is
  • Your age
  • Whether you are male or female
  • And whether you have any other health problems

On average, Trimethoprim will treat straightforward water infections using just one course of tablets (3 days). Women who are pregnant may need to take a course of 14 days. For patients that are using trimethoprim as a way to treat acne, a course of at least 6 months may be applicable.

Please note that it is very important that you complete the full course of antibiotics that have been prescribed to you. Should your infection clear whilst you are taking your course of trimethoprim, you should continue to take the tablets until the course has been completed to ensure that the infection does not return.

Trimethoprim Side Effects

Like all medications, there is a risk of experiencing a number of side effects, although not everyone will experience these side effects, we need to make our customers aware of any potential side effects that can be experienced whilst taking Trimethoprim.

The most common Trimethoprim side effects are:

  • Diarrhoea
  • Headaches
  • Sickness
  • Slight skin rash

If you experience any of the above side effects, it does not mean that you will have to discontinue using the medication however you should inform your doctor as soon as you start to experience any side effects.

How do I take Trimethoprim?

Trimethoprim comes in tablet form; you should take your tablets with a glass of water. You should always take your medication as prescribed by your doctor. Always complete your full course even if side effects completely clear up within a few days.

What if I forget to take it?

If you forget to take a dose, you should take it as soon as you remember, however if you remember  and it is nearly time for your next dose you should leave the missed dose and take your next tablet at the scheduled time as normal.

You should never take 2 doses at the same time; never double up on a dose in the event of forgetting to take a tablet.

Trimethoprim and Pregnancy Warning

Trimethoprim should only be taken during pregnancy as a last resort when all other options have not worked.

For pregnant women, folic acid is essential for the normal development of an unborn baby. Pregnant women will usually be prescribed 400mg of folic acid to help with the natural development of the foetus within the first 12 weeks of pregnancy.

Typically, trimethoprim lowers the body’s natural level of folic acid, if you are taking Trimethoprim within the first 12 weeks of pregnancy, your doctor will likely prescribe you with a high dose of folic acid for you to take in conjunction with Trimethoprim.

Trimethoprim does not provide any risks to pregnant women if taken after the first 12 weeks of pregnancy.

Always tell your doctor if you are pregnant or trying to conceive especially if you have been prescribed Trimethoprim.

Trimethoprim and Breastfeeding

Small amounts of Trimethoprim pass into the milk supply, however the amount is too small to cause any harm to the baby. We advise you to talk to your doctor or pharmacist if you are breastfeeding whilst taking Trimethoprim.

Trimethoprim drug interactions

If you are taking any other medications, it is possible that these may affect the way Trimethoprim works.

Please inform your doctor if you are taking any other medications. The most common medications that can interact with the effectiveness of Trimethoprim are:

  • Rifampicin – an antibiotic used to treat bacterial infections
  • Warfarin
  • Digoxin
  • Phenytoin
  • Diabetes medications

Please tell your pharmacist or Doctor if you are taking any other forms of medications, either prescription or over the counter medicines. This also includes any vitamins or supplements.

Trimethoprim and alcohol

Trimethoprim does not in any way interact with alcohol which means that you can drink during your course of treatment. However it is advised that if you are suffering from a UTI (Urinary Tract Infection) you should drink more water instead of alcohol.

Write Your Own Review
You're reviewing:Trimethoprim
Your Rating

No Related Posts

How It Works
  • 01. Choose Treatment

    Select the treatment or medication you need and answer a few questions online regarding your condition.

  • 02. Online Consultation

    Our Independent Prescribers will review your questions and assess your suitability for the medication.

  • 03. Express Delivery

    Your medication is dispensed and delivered directly to you from our UK based Pharmacy.

Medicine Direct Delivery Information

Delivery CompanyDelivery ServicePriceDetails
Free Delivery - Standard UK Tracked Free 3 - 4 Day Delivery
Next Day Delivery - Tracked £5.90 Order by 2pm for Next Day Delivery
Next Day Morning Delivery before 10.30am £13.90 Express Morning Delivery by 10.30am
DPD Delivery Tracked Saturday Delivery £9 On Orders placed before 2pm Friday