COVID-19 update: Our services are running as normal.
Phone Live Chat
Customer Service Team available now: Mon-Fri 8:00-17:00
  • Private & confidential service
  • Genuine medication
  • All-inclusive service - No hidden fees
  • Next day delivery
Home / Cystitis / Trimethoprim


Buy the antibiotic Trimethoprim in 100mg and 200mg dosage online to treat the symptoms of cystitis

  • Pack of 14 Trimethoprim Tablets BP 200mg
  • Front and rear view of Trimethoprim 200mg tablet blister packs
  • Front and rear view of Trimethoprim 200mg tablet blister packs
4.7 39 patient review(s) review
Dr. Anju Verma
Dr. Anju Verma Prescribing Doctor

Please note that the first line treatment for cystitis that is caused by a bacterial UTI is Nitrofurantoin, as there is quite a high bacterial resistance to Trimethoprim. Therefore it is wise to only use Trimethoprim to treat a UTI after a urine test has confirmed that the bacterial strain causing the infection is sensitive to Trimethoprim. Please note that this treatment is currently only offered for female patients. If you are male and are experiencing symptoms of a urinary tract infection, you should visit your GP or a sexual health clinic as this could be a sign of another infection or a more serious underlying problem.

How does Trimethoprim work?

When bacterial infections like cystitis spread, the individual cells need to produce DNA. To do this, these cells require a steady supply of folic acid. The cells produce the folic acid themselves, which is then used for the creation of new bacterial DNA. By doing this, the cystitis infection is able to spread faster than the body’s immune system is able to deal with it.

Trimethoprim is an antibiotic that works to prevent the infection from spreading. It does this by stopping the bacterial cells that cause cystitis from synthesising the folic acid that they need to be able to multiply. By acting in this way, this medication stops the spread of infection and renders the remaining cells extremely vulnerable to the immune system. This gives the body time to kill the remaining bacterial cells.

What are the benefits?

Trimethoprim is an extremely effective treatment for cystitis. This condition can cause a great deal of discomfort, with symptoms including pain when urinating and an uncomfortable burning sensation. As the bacteria can multiply so quickly, it can take a while for the body to naturally deal with the infection. This medication will help prevent the bacterial cells from multiplying and thus stop the infection from spreading. This means that Trimethoprim will significantly shorten the life span of the infection and provide quick and fast relief from the symptoms of cystitis.

Trimethoprim can also be used as a long-term preventative treatment for women who suffer from cystitis on a regular basis. For people who experience this as a recurring condition, this medication can be used to reduce the possibility of an infection developing and shorten the time taken for any potential infection to clear. This means that Trimethoprim is an effective treatment for cystitis in both the short and long term.

Who can buy Trimethoprim online?

You can buy Trimethoprim online at 121doc if you are a woman over the age of 18 who is experiencing the symptoms of cystitis. This medication is widely used and well researched and so it is generally well tolerated with a minimal risk of side effects occurring. There are some groups who may not be suitable for this treatment. You may not be suitable for Trimethoprim if you are pregnant or if you have kidney or blood disorders. If this applies to you, please consult with your doctor in order to find the right treatment option for you.

When you order this treatment, you will be required to complete an online medical consultation. It is important that you answer these questions fully and that you include any medical conditions that you are currently suffering from. This will allow our dedicated medical team to determine whether Trimethoprim is a suitable treatment for you. There are some medications that can have an effect on this treatment, so please include any medications that you are currently taking on the online consultation.

How do you use this treatment?

Trimethoprim comes in a 100mg and 200mg dosage, both of which are available at 121doc. The dosage needed will largely depend on the severity of your infection and whether you are using the medication as a long-term preventative treatment. As cystitis can be a recurring condition, Trimethoprim can be used to help reduce the risk of any potential infections developing.

The 200mg dosage of Trimethoprim is usually recommended in cases where the treatment is required for an existing infection. In these cases, one 200mg tablet should be taken twice a day for 14 days. You should take each tablet with a glass of water and you can take it with or without food. If you are using Trimethoprim as a preventative treatment against cystitis, the 100mg dosage will normally be prescribed. You should follow the instructions of your doctor in regards to how long the treatment should be continued for.

It is important that you take this medication as per the instructions. You should complete the course of antibiotics you have been prescribed, unless specifically told to do otherwise by your doctor. This means completing the prescribed course even if the cystitis symptoms that you were experiencing have cleared. You will be sent the patient leaflet along with your medication. This document will have full instructions on how and when to use this treatment. You are required to read this patient leaflet before starting your course of Trimethoprim.

Are there any side effects?

Trimethoprim is a widely used and well-tolerated medication and so the potential risk of side effects occurring is very small. If you do experience any, they can include vomiting, headaches and nausea. These side effects normally pass very quickly. Please contact your doctor if you experience any persistent side effects that cause you discomfort.

How to buy Trimethoprim online?

You can buy Trimethoprim online at 121doc by selecting your treatment and completing our quick and simple online medical questionnaire. Once completed, our doctors will review your details to make sure that Trimethoprim is the right treatment option for you. If approved, a prescription will be created and the medication dispensed from our UK registered pharmacy. We offer next day delivery to all of our customers at no extra cost.

Please note that the 100mg dosage is for continual use and 200mg is used for a recurrent bout.

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
Fill out a short medical form
Doctor issues prescription
Medication sent from pharmacy
Service ratings
Rating Excellent 4.7 4,942 patients have rated our service
Product ratings
Excellent 4.7 39 patients have reviewed Trimethoprim
Our Patients Love
  • Reachable and friendly customer serviceCustomer service online now: Mon-Fri 08:00 - 17:00
  • All-inclusive service - No hidden feesAll prices include shipping & prescription
  • Next day deliveryFor all orders before 16:30

Current reviews for the treatment Trimethoprim

Rated with 4.7 based on 39 independent customer reviews (See all 121doc reviews).

  • Excellent Product Review: Excellent service! Thank you. 05 Nov
  • Excellent Product Review: Great medication that's doing its job without side effects 10 May
  • Excellent Product Review: A reliable antibiotic for occasional problems with urinary tract infections. 24 Feb
  • Excellent Product Review: This product works for me every time 10 Feb
  • Average Product Review: Unfortunately did not work for me 21 Jan