Side effects of Trimethoprim tablets and how to buy in the UK Crescent

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Antibiotic tablets used to treat cystitis in women and men, Trimethoprim comes in both 100mg and 200mg dosages to alleviate symptoms of the urinary tract infection (UTI) within days and clear the infection within a week.

With medication in the UK, you must obtain a prescription that we provide after you have completed a quick consultation. Once your symptoms and medical history has been checked, our doctors can issue your prescription and you can receive your medication the next working day free of charge.

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Dr Hilary JonesDr Hilary Jones
Medical Advisor

"Having a cystitis infection can be both painful and irritating. Fortunately offers a prescription cystitis treatment that can prevent the bacteria from spreading."

Registered Pharmacy National pharmacy association
Treatment Information
Product Name: Trimethoprim
Active Ingredient(s): Sulfamethoxazole
Manufacturer: Crescent Pharma
Administration: Oral
Presentation: Tablets
Available Dosage: 100 mg, 200 mg
Exemption: Subject to medical prescription
Application: Women over 18 with the symptoms of cystitis
Posology: Take 1 tablet twice a day for up to 14 days
Description: Trimethoprim is an antibiotic that is used as an effective treatment for the bladder infection cystitis.
Drug class: Sulfonamides and folic acid inhibitors
Alcohol consumption: No influence
When breastfeeding: Caution is recommended, ask your doctor
When pregnant: Caution is recommended, ask your doctor

How to buy Trimethoprim online?

At OnlineClinic, you can order Trimethoprim 100mg or 200mg pills depending on your preference combined with the doctor's recommendation based on your symptoms. Trimethoprim 100mg is taken once daily whilst 200mg pills are taken twice daily. It's important to always complete your course of antibiotics to ensure the infection has cleared. Starting your medication quickly can stop symptoms from worsening, with many finding significant relief within just three days of beginning the course, so we offer free next day delivery with any dosage option.

To buy any medication that has gone through medical trials in the UK, you must have a prescription certified by a UK doctor to prove it is suitable and safe for you to use. OnlineClinic provide this in the form of a free online consultation based on secure medical questions that is reviewed by one of our team of doctors. When it is clear that the infection is cystitis, you want to get effective treatment quickly, so if you complete your order before 4pm you will get Trimethoprim delivered the very next day. All packages are discreet meaning you can get your treatment delivered wherever you need with complete confidentiality.

Short facts about Trimethoprim
How to take

One Trimethoprim tablet should be taken a day, ideally in the evening, with or without food. This is the standard dosage for UTIs, it may vary for other conditions, or severity.

How it works

Trimethoprim works by significantly reducing the production of folic acid so the bacteria causing the symptoms of cystitis can't spread. This allows your immune system to combat the infection.


Trimethoprim is clinically proven to relieve symptoms within days. Many women find the infection clearing entirely within one week.


Available in both 100mg and 200mg pills. 100mg is recommended as a preventative treatment for daily use, whilst 200mg is a 7-day course.

Side effects

Side effects of Trimethoprim are usually temporary and very manageable. These only occur for the small percentage of women and can include nausea or vomiting and headaches.

Current reviews for the treatment Trimethoprim Rated with 4.9/5 based on 68 Independent customer reviews on Feefo (See all Online Clinic reviews).
Product review: Exactly what I ordered
Service review: Quick and easy to use
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Product review: Probably one of the best services I have used this year. Ordered pi..
Service review: Probably one of the best services I have used this year. Ordered pills for cystitis before midday..
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Product review: Great antibiotic for urinary infection
Service review: Quick response - delivered same day
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Product review: works everytime for me as I have a specific condition
Service review: very efficient fast service
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Product review: exactly what i needed
Service review: pleasure to deal with
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