Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Metronidazole is an antibiotic that also works against certain parasites. It treats specific gut, dental, gynaecological and skin infections. Key rule: no alcohol during the course.
Typical dose — general reference only, NOT a prescription
Measure
Range
Category
Prescription
Adult dose
400 mg every 8 hours (range 200–800 mg by condition)
Child (paediatric) dose
7.5 mg/kg per dose every 8 hours, by weight
What it is used for
Gut infections (amoebiasis, giardia)
Dental and gum infections
Bacterial vaginosis and some pelvic infections
Some skin and wound infections
Common brand names
India: Flagyl, Metrogyl, Aristogyl
Worldwide: Flagyl, Metrogel
Common side effects
Metallic taste
Nausea or reduced appetite
Dark-coloured urine (harmless)
Before taking it — precautions
Avoid all alcohol during and 48 hours after the course
Complete the course
Tell your doctor about liver disease
When to see a doctor urgently
Strong reaction with alcohol (flushing, vomiting, fast heartbeat)
Numbness/tingling on long courses
Severe allergy
Doses are a general reference, not a prescription. Doses shown are typical adult/paediatric references and vary with age, weight, kidney/liver function and the exact product. Paediatric doses are usually weight-based and must be set by a doctor. MedDroid cannot prescribe — always confirm metronidazole and your dose with a doctor or pharmacist and the leaflet inside the pack.
Frequently asked questions
Why no alcohol with metronidazole?
The combination can cause flushing, nausea, vomiting and a racing heart. Avoid alcohol during the course and for 48 hours after.
Why is my urine darker?
Metronidazole can harmlessly darken urine — a known, temporary effect.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.