Metronidazole Vioser (Metronidazole)

Metronidazole Vioser is a nitroimidazole antibiotic used to manage infections caused by anaerobic bacteria and certain protozoa.

• Anaerobic bacterial infections: effective against mixed anaerobic infections, reducing bacterial load.
• Bacterial vaginosis: restores normal vaginal flora by eliminating pathogenic anaerobes.
• Trichomoniasis: eradicates Trichomonas vaginalis, relieving symptoms.
• Amoebic dysentery: eliminates Entamoeba histolytica trophozoites in intestinal disease.
• Intra‑abdominal infections: controls polymicrobial infections following surgery or perforation.
• Pelvic inflammatory disease: treats mixed anaerobic organisms contributing to PID.

• Metronidazole is reduced within susceptible microorganisms to generate nitro radical anions. These reactive species damage DNA and inhibit nucleic acid synthesis, leading to cell death of anaerobic bacteria and protozoa while sparing aerobic cells.

Metronidazole may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Nausea: mild to moderate upset stomach.
• Metallic taste: transient alteration of taste perception.
• Headache: occasional throbbing discomfort.
• Diarrhea: loose stools during therapy.
• Abdominal pain: cramping or discomfort.
• Dizziness: light‑headed sensation.

Serious or Rare Side Effects

• Severe allergic reactions: anaphylaxis or skin rash.
• Seizures: rare neurologic events.
• Neutropenia: low white‑blood‑cell count.
• Stevens‑Johnson syndrome: severe skin and mucosal involvement.
• Hepatic dysfunction: elevated liver enzymes.
• Peripheral neuropathy: tingling or numbness in extremities.

Metronidazole Vioser requires careful consideration of patient‑specific factors and proper handling.

• Renal impairment: adjust dosing and monitor renal function.
• Hepatic dysfunction: monitor liver enzymes during therapy.
• Alcohol consumption: avoid to prevent disulfiram‑like reaction.
• Pregnancy: use only when benefits outweigh potential risks.
• Concurrent warfarin therapy: monitor INR closely for increased anticoagulation.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Metronidazole interacts with several medicines; some require avoidance while others need monitoring.

Major Interactions (Avoid)

• Alcohol: may cause severe disulfiram‑like reaction.
• Warfarin: increased anticoagulant effect, risk of bleeding.
• Lithium: heightened lithium toxicity.

Moderate Interactions (Monitor Closely)

• Cimetidine: may raise metronidazole plasma levels.
• Phenobarbital: may reduce metronidazole efficacy.
• Phenytoin: may lower therapeutic concentrations of metronidazole.