A New Treated is Coming. Read more.
Registered Pharmacy
24hr Free Delivery
No Registration Needed

Trichomonas vaginalis (TV) treatment


Metronidazole is an antibiotic medication used to treat infections caused by trichomonas vaginalis (TV). It is available as a generic or branded tablet (Flagyl).

PLEASE NOTE: As Metronidazole is a generic medicine, the brand of the product you receive may be different to the one shown in the picture.

You can buy Metronidazole online to treat TV if you have received a positive test result. Take our questionnaire and upload your test result, and your order will be reviewed by our doctor.

+3500 Trustpilot reviews
PLEASE NOTE: This treatment is not available through our online pharmacy service. This page is for information only. If you are experiencing any of the symptoms related to the condition(s) this medication treats, we strongly recommend that you see your GP in person.

This content was reviewed by a clinician on

26 April 2022
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 26 April 2022
Product information

Metronidazole is an antibiotic medicine. It belongs to a category of treatments which target anaerobic bacteria and protozoa, and is indicated for a number of different infections. Among these are trichomoniasis (or TV) and bacterial vaginosis (BV). The medication is supplied in standard tablet form as a generic and as a branded medicine called Flagyl (marketed by Zentiva).

Trichomoniasis is a type of STI (sexually transmitted infection). It is caused by a parasite called trichomonas vaginalis, which can be passed from one individual to another through unprotected vaginal or oral sex, or through the use of sex toys. Symptoms of the illness are different depending on the gender of the person infected.

In women, these might include an inflamed or sore vagina, urinary pain, yellow-green vaginal discharge or lower abdominal pain. For men, the condition might be characterised by pain during urination, inflammation of the tip of the penis, and white discharge. However, half of men and women with the condition may have no symptoms at all.

The preferred treatment for trichomoniasis is metronidazole, which is available as a generic medicine or as a branded treatment called Flagyl. They work in exactly the same way, but Flagyl is slightly more expensive because it is a branded treatment.

Metronidazole works by stopping the bacteria or protozoa which causes the infection from spreading. It does this by inhibiting the synthesis of certain acids, which the cells of the offending bacteria or parasite need to increase their presence in the body. When these cells are prevented from achieving further growth, they become susceptible to attack from the immune system, which then fights the infection off.

It is important to get tested if you think you have an infection caused by TV. Your GP will be able to direct you to appropriate services, or you can visit your local GUM clinic. We also offer test kits to buy online, which allow you to provide a urine sample at home.

Patients with a positive test result can buy TV treatment online through our confidential service. Take our questionnaire to have your prescription request reviewed by our doctor. After your order has been authorised, your treatment will be dispensed at our UK pharmacy and shipped by tracked next-day parcel.

Sex after TV treatment

Once you have finished treatment for TV, we recommend waiting up to three weeks before taking a second test to ensure the infection has been completely eradicated. After a second test confirms there is no presence of TV, you can then practice sex again. 

Page last reviewed:  26/04/2022


Ensure you follow the directions your prescriber provides, and read the patient information leaflet before use.

  1. Take the medicine as prescribed.
  2. The typical dose for TV is 400mg twice daily for 5-7 days.
  3. People with HIV may be issued a higher dose.
  4. Swallow tablets whole with water.
  5. Do not take more than your doctor tells you to.
  6. Do not drink alcohol when using this treatment, or for 48 hours after finishing the course.
  7. Never make up for a missed dose with a double dose. If you forget to take your medicine, continue the prescribed course as planned.

The directions supplied here are only intended as a guide. More detailed information can be found the leaflet provided.

Page last reviewed:  26/04/2022
Please read the patient information leaflet for this medicine fully before use:

Metronidazole Generic - 400mg

Flagyl 400mg

Side effects & Warnings

Side effects

Not everyone using this product will experience side effects. Nonetheless, it is important to be aware of what these are, so that you can take the necessary action should you begin to experience them.

A metallic taste in the mouth is fairly common.

Frequency unknown:

Jaundice, allergic reaction, brain disease, loss of coordination, confusion, infections, mouth ulcers, bruising, bleeding gums, tiredness, pancreatitis, convulsions, hallucinations, sight problems, skin rash, headache, cloudy urine, numbness, tingling, pain, weakness, feeling or being sick, upset stomach, or diarrhoea.


Taking it with other medicines

Tell your doctor during consultation if you are currently using other medication, as these may affect your suitability for the treatment. Metronidazole may interact with the  following: anticoagulants; epilepsy treatments such as phenytoin, primidone or phenobarbitone; 5 fluorouracil; busulfan; ciclosporin; and lithium.

Conditions to look out for

Persons with a history of certain conditions, such as liver or kidney problems, or a disease affecting the nervous system, may not be able to take this product. Inform your doctor of any medical conditions you may have or have had in the past before using this medicine.

Pregnancy and breastfeeding

It is important that this medication is not used at all in the first three months of pregnancy. It also should not be taken during the rest of pregnancy. If you are breastfeeding you should stop whilst taking a course of Metronidazole and for at least 12-24 hours after you finish your medication. Your doctor or pharmacist can provide advice about pregnancy or breastfeeding and this treatment.

Driving and machinery

This treatment may cause you to feel drowsy, confused, dizzy or alter your vision, cause fits or hallucinations. If you notice any of these symptoms you should not drive or operate machines. Do not put yourself or others at any undue risk.


You must not drink alcohol when taking this medicine, or within 48 hours of finishing the course.

Lactose intolerance

Metronidazole contains lactose sugars. If you have been made aware of an intolerance to some sugars, you should speak to your doctor before commencing a course of treatment.

Further testing

If you take this medication for longer than ten days, your doctor may wish to investigate further by carrying out more tests.

Page last reviewed:  26/04/2022
Please read the patient information leaflet for this medicine fully before use:

Metronidazole Generic - 400mg

Flagyl 400mg


Can I still drink alcohol?

No. Alcohol may limit the efficacy of this treatment, and make you more susceptible to side effects. You should refrain from drinking alcohol during its use and for at least 48 hours after finishing the course.

Will I still be able to drive?

If you experience no side effects, your capacity to drive should not be affected. However, if you experience any adverse effects which impair your judgment or motor functions, then you should not drive and contact your doctor immediately.

Can I take this medicine while pregnant?

Speak to your doctor for advice if you are pregnant or breastfeeding.

How do I store it?

In a safe place out of the reach of children, at room temperature.

Am I allergic to anything in the medicine?

Metronidazole tablets contain metronidazole, povidone, magnesium stearate, colloidal anhydrous silica and maize starch.

Flagyl contains metronidazole, calcium hydrogen phosphate (E341), starch maize, povidone K30 (E1201) and magnesium stearate, pharmacoat 615 (E464), and macrogol 400.

Do not use this treatment if you are allergic or unable to tolerate anything contained in it.

When can I have sex again? 

Only after a second test confirms no presence of TV is it safe to engage in sexual activity. A second test should be taken three weeks after treatment is concluded, this will ensure all traces of the bacteria are gone.

Is it available over-the-counter?

No. You will need a prescription before you can buy Metronidazole from a UK pharmacy.

How can I buy TV treatment online?

We recommend you get tested if you have symptoms of TV, or don’t have symptoms but think you may have come into contact with it. You can do this by going to your local sexual health services, or alternatively by ordering a test kit online from us.

If you have a positive test result for TV, you can buy Metronidazole online using our UK pharmacy service. Select ‘buy now’ to proceed to our questionnaire, and upload your test result for our doctor. Once your order is approved, your medication will be issued by our pharmacy dispensing team and delivered to you by next-day parcel.

Page last reviewed:  26/04/2022
Treated.com is rated 4.9 out of 5 by 3466 customers on TrustPilot!
A simple process
Getting the treatment you need has never been easier with our speedy and simple online service.
  • Search for your medicine

    Find the treatment you need.
  • Fill in a simple questionnaire

    A GMC-registered doctor or a pharmacy prescriber will review your answers.
  • 24h delivery to your door

    Next-day delivery. Every order is sent by tracked courier.
  • Repeat ordering is easy

    We keep your details secure so you can reorder with ease.

No matches found. You can find all our treatments here