Metronidazole
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Molecule Description
Metronidazole is an anti-infective medicine. It is used in treating infections of various parts of the body caused by many microorganisms, including bacteria and amoeba-like organisms (protozoan parasites). This medicine is not recommended to be used by pregnant women and lactating mothers and should be used with caution in elderly patients. Metronidazole should be taken as instructed by the doctor. You should complete the entire treatment with this medicine as prescribed by the doctor and not stop taking this medicine abruptly, even if you feel better.
Uses
- Metronidazole is used to treat parasitic infections such as amoebiasis.
- It is used to prevent sexually transmitted infections such as urogenital trichomoniasis or giardiasis.
- It is also used to treat infections of the gums, teeth and skin due to various infective microorganisms.
Contraindications
When should one not use Metronidazole
- If you are allergic to metronidazole
- If you are pregnant (first trimester) or are breastfeeding.
- If you are suffering from a bacterial infection in the vagina.
Side effects
Common side effects of this drug are:
- Headache
- Vomiting
- Abdominal cramps
- Eating disorder
- Unpleasant taste
- Pain or stomach discomfort
Precautions and Warnings
Pregnancy
Breast Feeding
Driving
Alcohol
Other General Warnings
Talk to your doctor if
- You suffer from blood disorders like blood-fluid imbalance (dyscrasias) or porphyria.
- You had or have a history of fits or epilepsy.
- You are taking it for more than 10 days.
- You are pregnant or are breastfeeding.
- You experience infections.
- You have peripheral neuropathy (abnormal, painful sensations like pins and needles).
- You have liver or kidney disease or are on dialysis.
- You are suffering from Cockayne syndrome (growth retardation, impaired development of the brain and sensitivity to sunlight).
- You are an alcoholic and must avoid alcohol during the treatment and at least after 48 hours of discontinuation of the treatment.
Mode of Action
How Does It Work?
Metronidazole acts by stopping the growth of certain bacteria and parasites which are responsible for infection by interrupting the DNA and causing the DNA strands to break.
Interactions
Interactions with other medicines
- Metronidazole when taking along with Lithium which is used to treat psychiatric disorders can cause kidney damage.
- Concomitant use of Metronidazole with anticoagulants like Warfarin may potentiate the anticoagulant effects.
- Concomitant use of disulfiram which is used to treat alcohol addiction can cause mental disorders like hallucinations, etc.
- Concomitant use of Metronidazole can reduce the efficacy of oral contraceptives. Thus, a physical barrier should be used for effective contraception.
- Be cautious if you are taking immunosuppressants like Ciclosporin with Metronidazole as it can increase the levels of ciclosporin in the body.
- Other medicines which may affect the activity of Metronidazole are antacids like Cimetidine, Fluorouracil to treat cancer, Phenytoin or Primidone to treat fits or epilepsy.
- Discuss with your doctor about any other medicine, herbal preparation and supplements you are giving to your child currently to avoid any possible drug interactions.
Dosage
Overdose
Overdose of Metronidazole can cause nausea, vomiting, diarrhoea, weight loss, disturbance in taste, headache, dizziness, drowsiness and lack of sleep. If you think you have taken too much of this medicine, contact your doctor immediately or visit the nearest hospital.
Missed a Dose
If you missed any dose of this medicine, take it as soon as you remember. If it's time for your next dose, skip the missed dose and continue with your regular dose schedule. Do not take a double dose of medicine to compensate for the missed one.
Frequently Asked Questions (FAQs)
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References:
- CDSCO [Internet]. Cdscoonline.gov.in. 2025 [cited 16 September 2025]
- Metronidazole 500 mg Film-Coated Tablets - Summary of Product Characteristics (SmPC) - (emc) [Internet]. Medicines.org.uk. 2025 [cited 16 September 2025]
- Metronidazole [Internet]. Ncbi.nlm.nih.gov. 2025 [cited 16 September 2025]
- Flagyl Tablet [Internet]. Accessdata.fda.gov. 2025 [cited 16 September 2025]
- National Library of Medicine (US). Cyclobenzaprine: MedlinePlus Drug Information [Internet]. Bethesda (MD): National Institutes of Health; 2025 [cited 16 September 2025]
- NHS. About metronidazole. NHS [Internet]. 2025 [cited 16 September 2025]
- NHS. Metronidazole: overview. [Internet]. NHS; 2025 [cited 16 September 2025]
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