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Home / Sexual Health / Bacterial Vaginosis / Metronidazole


  • Pack of 21 Metronidazole 400mg oral tablets
  • Box of Metronidazole tablets with blister packs
  • Back view of Metronidazole 400mg tablets blister pack

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Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.

What is Metronidazole?

Metronidazole is a clinically proven and effective antibiotic that is used to treat STIs, bacterial vaginosis, mouth and gut infections. It's used to clear infections inside the body and as a preventative before surgery.

A week's course of Metronidazole is usually enough to clear an infection. It's an alternative option to penicillin- based antibiotics for those with allergies.

Metronidazole is generally taken in tablet form over the course of a week to kill infections. You must take the whole course, but if you don't start to feel better within few days seek medical advice.

Metronidazole is sometimes marketed under the brand name Flagyl.

How Does Metronidazole Work?

Bacteria spread rapidly throughout your body causing fever and pain. To stand the best chance of curing an infection selecting the right type of treatment is important. Broad spectrum antibiotics can be used for most bacterial infections but Metronidazole is specifically proven to clear protozoan infections. This includes sexually transmitted infections like trichomoniasis, bacterial vaginosis, which is not an STI but the overgrowth of bacteria in the vagina, and infections of the mouth, gum and intestines. The bacteria invading these body areas are known as 'anaerobic' bacteria because they don't need oxygen to survive. Broad spectrum antibiotics cannot always kill these types of bacteria which may lead to you needing a second course of treatment.

Metronidazole works with your immune system to clear infections. It enters the cells of the disease and interferes with its DNA, hampering its ability to breed. The infection will begin to die off and your immune system will clear away the weakened bacteria.

How To Take Metronidazole

Metronidazole is an effective treatment against infection but it's important to finish the full course, even if you feel well again. The length of the course will be down to your particular illness, and you should take the tablets as your doctor has directed.

Swallow Metronidazole tablets whole with a drink of water. The tablets should not be chewed, crushed or cut as this can lead to your absorbing the active ingredient too quickly. Often doctors recommend you take Metronidazole just after a meal, but certain infections will require an empty stomach. If you are unsure speak to your doctor because directions for use can be just as important as the treatment itself.

What do I do if I've missed a dose?

Skipping a dose means the infection may not clear and in the future, you risk developing antibiotic resistant infections. If you forget to take your dose, take it when you remember - but if it is close to the next dose, it should be left. Don't take extra tablets to make up for a missed dose as this increases the risk of side effects.

How do I store Metronidazole?

Store Metronidazole at room temperature away from moisture and heat. This includes hot or cold windowsills and chilly overnight or sun-heated cars.


The standard dose of Metronidazole is 400mgs taken as 14 tablets over the course of a week. This is enough to clear bacterial vaginosis or trichomoniasis infections. A 400mg dose is high enough to clear an infection completely, but low enough to avoid most side effects. Spacing out the doses evenly is important for the best results.

Metronidazole Side Effects

All prescription medicines are prone to side effects. Not every person will experience them but if they do, they are often mild and don't interfere with everyday life. Because a course of Metronidazole is short and the outcome beneficial, it is often worth persevering with non-harmful side effects. If they become intolerable or worsen you should seek medical advice.

Common side effects include:

  • Stomach cramps
  • Dizziness
  • Heartburn
  • Spinning sensations
  • Sleeping troubles
  • Weight loss
  • Genital itching (thrush)

More rare side effects include:

  • Taste changes
  • Congestions
  • A dry mouth
  • Swollen neck glands
  • Pain around the eyes and cheekbones
  • Voice changes
  • Lack of interest in sex, erection difficulties, pain during sex

Rare but serious side effects that require medical attention include an allergic reaction. If your hands, feet, ankles, face, lips or throat swell, become itchy or you can't breathe properly you need immediate medical attention. This type of allergic reaction is rare.

Other rare but serious side effects include visual disturbances, back pain, burning pains, numbness, tingling in the hands and feet, convulsions or hallucinations. A very rare side effect is encephalopathy (brain disease) symptoms include a stiff neck, fever, headache and hallucination.

If you experience worrying side effects you should always speak to a doctor. Prescription doses can often be altered or you may be better off using a different type of antibiotic. A doctor is best placed to advise on adverse side effects.

Metronidazole Precautions

Adults, the elderly and children can use Metronidazole when prescribed a course by their doctor, but only adults over the age of 18 can buy it online. Metronidazole is used to treat infections in individuals worldwide because it is generally safe, effective and fast-acting.

Men can use Metronidazole to treat trichomoniasis and women to treat trichomoniasis and bacterial vaginosis, but there are some people for whom it is not suitable unless a doctor recommends it. These include:

  • If you have ever had a liver problem.
  • You are having kidney dialysis.
  • You have a nervous system disease.
  • If you have an intestinal disease, such as Crohn's disease.
  • You are pregnant or breastfeeding. Metronidazole may be dangerous in pregnancy and should not be used unless deemed necessary by your doctor. During breastfeeding, Metronidazole will pass trace amount to the infant. This can result in the infant developing thrush or diarrhoea or potentially dangerous complications.
  • If you are allergic to any of the ingredients, or have experienced an adverse reaction to medicines with Metronidazole in the past.

Metronidazole has been shown to interact adversely with alcohol. Avoiding alcohol during the course of your medicine and for three days afterwards is recommended. Uncomfortable side effects can result if Metronidazole is taken with alcohol. These include nausea, vomiting, red skin, a racing heart and tingling skin sensations. You should check food products and over-the-counter medicines to make sure they do not contain alcohol. Cold and cough medication frequently contains alcohol and should be avoided whilst you take Metronidazole.

Certain blood tests or an adjusted dose may need to be taken if the drug is prescribed for longer than ten days.

If you are due any medical tests, either regular or for a specific illness, ensure that your medical professional knows you are taking or have recently taken Metronidazole because it can interfere with test results.

Other Medication Interactions

Metronidazole is a prescription medicine because it is unsuitable for some individuals and because it can interact with other medications. This can stop your current medication working correctly or prevent Metronidazole from clearing an infection. Speak to your doctor if you take any of the following drugs:

  • Anti-coagulants such as warfarin. Warfarin thins the blood and is often prescribed after heart surgery or heart attacks. A reduced dose of warfarin may be needed if it's taken with Metronidazole.
  • Lithium and Metronidazole taken together may affect kidney function.
  • Epilepsy medicines may stop a course of Metronidazole from working correctly.
  • Certain cancer medicines such as fluorouracil and busulfan for leukaemia may be affected by Metronidazole.
  • Anti-organ rejection drugs such as Ciclosporin can be adversely affected by Metronidazole.
  • Alcoholism drugs, as well as drinking alcohol, with Metronidazole can cause contraindications.

It's important that you don't suddenly stop taking prescribed medicines if you need Metronidazole. Speak to your doctor about the best course of action.

Until recently it was thought that all antibiotic interfered with contraceptive pills. However, it's now believed that only certain types of antibiotic are affected. Metronidazole is not an antibiotic that prevents the pill from working, however, if you experience vomiting or diarrhoea you should take extra barrier precautions. Sickness can mean contraceptive pills are not properly absorbed, potentially leading to pregnancy.

Can you buy without a prescription?

No, antibiotics of all classes are prescription only medicines.

This is because they may have contraindications or pose a danger to people with serious health conditions.

There is also the growing instance of antibiotic-resistant bacteria, such as a strain of gonorrhoea that does not respond to conventional treatment. Taking antibiotics for colds, flu and viruses does not improve health, but only serves to increase the number of resistant strains. Individuals should only take antibiotics if they are essential. Cases of bacterial vaginosis or trichomoniasis are two infections that do need antibiotic treatment and are effectively cleared by Metronidazole.

How To Get Metronidazole

When buying Metronidazole 400mg tablets to treat bacterial infections and STIs, you will have had to of tested positive for this form of STI. You will then obtain a prescription. Testing for an STI can be done at some doctor's surgeries, sexual health clinics and at home if you are a young person between 16-24 years in the UK. When buying Metronidazole online, you will still require a prescription. This can be easily obtained when completing our quick online consultation that will take approximately five minutes. A certified doctor reviews this, allowing you to order Metronidazole tablets online.

Is it safe to order online?

When ordering from a certified online pharmacy, you can be ensured that your medication is safe. If the pharmacy doesn't ask you to complete essential health and medical questions, however, this is a telltale sign that the website isn't certified. The website should also display clear signs that it is registered and approved by the relevant authorities. In the UK, this includes being registered by the MHRA, GMC .

All medication will be delivered in tamper proof packaging complete with the full patient leaflet, which confirms that the medication is clinically proven and highly effective.

What is included in the price?

When ordering Metronidazole tablets online here at Medilico, this is an all-inclusive price including the prescription, consultation, medication and delivery. There are no hidden costs. This medication is only available in one dose of 400mg and one quantity of 14 tablets.

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