Metronidazole — An antibiotic for treating Bacterial Vaginosis (BV), helping to resolve abnormal discharge and unpleasant odor.
💊 Metronidazole 400 mg — An antibiotic that kills bacteria causing vaginal infections
🩺 Treats abnormal discharge — Effectively addresses gray discharge and fishy odor from BV
✅ Doctor-recommended — First-line treatment for Bacterial Vaginosis
📦 1 strip contains 10 tablets — 400 mg per tablet
💡 How to take — Take 1 tablet twice daily (morning & evening) after meals for 7 consecutive days
⚠️ Complete the full course — To prevent recurrence and antibiotic resistance
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What is Metronidazole?
Metronidazole is a 400 mg antibiotic used to treat bacterial vaginosis, working by killing the bacteria that cause abnormal grayish, foul-smelling discharge. It is the first-choice medication for this condition. Take 1 tablet twice daily, morning and evening, after food, for 7 consecutive days. The full course must be completed to prevent recurrence and antibiotic resistance.
🛒 10 tablets per strip (400 mg) · authentic, FDA-registered · 24-hour dispatch from Intimo Life — consult a doctor or pharmacist before use.
Product Description
Vaginal discharge medication is essential for women experiencing abnormal discharge from bacterial or protozoal infections. Metronidazole is a vaginal infection treatment containing Metronidazole 200/400 mg, classified as a Nitroimidazole. It is a generic medication with the exact same active ingredient as Metrolex, differing only in brand name.
📊 Key Statistics
Bacterial Vaginosis (BV) — The most common cause of abnormal vaginal discharge in women of reproductive age, affecting up to 30% of women
Trichomoniasis — A common sexually transmitted infection, more prevalent in women than men
Metronidazole works by destroying the DNA of anaerobic microorganisms and protozoa, effectively killing the pathogens
See other vaginal health products in the Vaginal Health collection
🏭 Metronidazole is a generic medication with the same active ingredient as Metrolex, differing only in brand and manufacturer. Thai FDA approved, with identical usage instructions.
⚠️ Critical warning: Do not drink alcohol while taking this medication and for at least 48 hours after stopping, as it may cause a dangerous disulfiram-like reaction.
Medically reviewed by
Supatcheree A., Pharmacist | Sources: NHS UK Metronidazole, StatPearls, CDC STI Guidelines
Last reviewed: 2026-02-17
About Metronidazole
What is Metronidazole?
Metronidazole is an oral vaginal infection medication containing Metronidazole 200/400 mg as its active ingredient. It belongs to the Nitroimidazole drug class, functioning as both an antibiotic and antiprotozoal agent. It is a generic medication.
Metronidazole works by entering the cells of anaerobic microorganisms and protozoa, then directly destroying their DNA, preventing them from dividing and ultimately killing them. This mechanism makes it highly effective against anaerobic bacteria and protozoa but not against aerobic bacteria.
Metronidazole contains the same active ingredient as Metrolex — only the brand name and manufacturer differ. Efficacy is equivalent, so usage information is very similar.
What is Metronidazole used for?
Bacterial Vaginosis (BV): The most common indication. Presents as fishy-smelling, greyish-white discharge. Metronidazole is the first-line treatment for BV.
Trichomoniasis: STI caused by Trichomonas vaginalis — yellowish-green, frothy, itchy discharge. Metronidazole is the primary treatment.
Other anaerobic infections: Intra-abdominal infections, liver abscess, pelvic infections.
Giardiasis: Intestinal infection by Giardia lamblia causing chronic diarrhoea.
Amoebiasis: Amoebic infections and amoebic dysentery.
H. pylori: Used in combination with other medications for H. pylori eradication regimens for stomach ulcers.
How to Take Metronidazole / Dosage
Vaginal discharge / Bacterial Vaginosis: Take 400 mg twice daily (morning and evening) for 7 consecutive days, or 2 g single dose. Your doctor will choose the appropriate regimen.
Trichomoniasis: 400 mg twice daily for 7 days, or 2 g single dose (both patient and sexual partner must be treated simultaneously).
Important: Take with or after food to reduce nausea. Swallow whole with water.
If you miss a dose: Take as soon as you remember, but if it's close to the next dose, skip it. Never take a double dose.
⚠️ Critical: Complete the full course even if symptoms improve early. Stopping early may cause antibiotic resistance and recurrence.
Side Effects of Metronidazole
Common side effects:
Nausea, vomiting — most common; reduced by taking with food
Metallic taste in the mouth — common; resolves after stopping
Loss of appetite
Abdominal pain, diarrhoea
Dry mouth, coated tongue
Serious side effects (stop taking and seek medical attention):
Peripheral neuropathy — numbness, tingling in hands/feet; stop immediately
Seizures — rare but requires immediate discontinuation
Severe allergic reaction — rash, hives, facial swelling, breathing difficulty
Dark urine — may occur; not harmful but inform your doctor
Contraindications & Precautions
⚠️ Most important warning — No alcohol:
Do not drink alcohol while taking this medication and for at least 48 hours after stopping
Combining alcohol with Metronidazole causes a disulfiram-like reaction — severe nausea/vomiting, headache, facial flushing, rapid heartbeat, low blood pressure
This includes alcohol-containing products such as mouthwash and some liquid medicines
Do not use:
Allergy to Metronidazole or Nitroimidazole drugs
First trimester of pregnancy
Use with caution:
Liver disease — dose reduction may be needed
Neurological conditions
Breastfeeding — drug passes into breast milk; consult doctor
Avoid use for more than 10 days due to increased neuropathy risk
How Does Metronidazole Compare to Other Vaginal Infection Treatments?
Metronidazole vs. Metrolex: Same active ingredient (Metronidazole). Both are generics, differing only in brand and manufacturer. Equivalent efficacy — choose based on availability and price.
Metronidazole vs. Clindamycin Vaginal: Clindamycin vaginal suppository also treats BV. Advantage: local action with no alcohol interaction concern. However, oral Metronidazole is easier to use and covers a broader spectrum including Trichomoniasis.
How Long Does Metronidazole Take to Work?
Metronidazole has a half-life of approximately 8 hours. Peak blood levels are reached within 1–2 hours after taking.
For vaginal discharge / BV: Symptoms usually begin improving within 2–3 days, but you must complete the full 7-day course even if symptoms improve earlier.
For Trichomoniasis: Symptoms usually improve within the first week of treatment.
If symptoms don't improve after completing the course, or if they recur, consult your doctor for further investigation.
Where Can I Buy Metronidazole?
Metronidazole is a pharmacist-dispensed medication. You can order online from Intimo Life.
Can I buy Metronidazole online?
Yes. Order through Intimo Life — select the product, consult with a licensed pharmacist online, and receive your medication at home.
Do I need a prescription?
A doctor's prescription is not required, but the medication must be dispensed by a licensed pharmacist. At Intimo Life, our pharmacist will review your symptoms and health history to confirm suitability before shipping.
How does Intimo Life ship orders?
We deliver nationwide in Thailand with discreet packaging — no product names on the outside.
⚠️ Disclaimer
The information on this page is for general informational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment from a qualified doctor or pharmacist. If you have any questions about your symptoms or medication, always consult a doctor or pharmacist first.
Same active ingredient (Metronidazole). Both are generics differing only in brand and manufacturer. Equivalent efficacy — choose based on availability and price.
Metronidazole inhibits enzymes that break down alcohol, causing toxic acetaldehyde accumulation — a disulfiram-like reaction with severe nausea/vomiting, headache, facial flushing, rapid heartbeat, and low blood pressure. Avoid all forms of alcohol including alcohol-containing mouthwash, and continue avoiding for 48 hours after stopping.
For vaginal discharge/BV, complete the full 7-day course as prescribed, even if symptoms improve after 2–3 days. Stopping early risks incomplete eradication, resistance, and recurrence. A 2 g single dose is an alternative one-time option.
Abnormal discharge needing medical attention: yellow, green, or grey colour; fishy or foul smell; frothy or thick consistency; accompanying itching; blood-tinged; or with lower abdominal pain. Clear or white odourless discharge is normal. Metronidazole treats bacterial/protozoal infections, not fungal (which requires antifungal medication).
It depends on the infection type. For Trichomoniasis — partners must always be treated simultaneously as it's an STI; treating only one partner leads to reinfection. For Bacterial Vaginosis (BV) — male partners generally don't need treatment, but if recurrences are frequent, the doctor may consider treating the partner.
Generic medications contain the same active ingredient as the originator, certified by the Thai FDA for equivalent quality, safety, and efficacy. They may differ in excipients, colour, flavour, or tablet shape, but the active ingredient works the same. For Metronidazole, both generic and Metrolex are generic medications with the same active ingredient.
Related Products
Products with the same active ingredient or treating the similar condition.
Metrolex
