Metronidazole: Brands, Price & Uses in Bangladesh

Metronidazole is a nitroimidazole antimicrobial used to treat a range of anaerobic bacterial and protozoal infections. Its indications can be grouped by strength of evidence:

Established/FDA-approved uses

• Anaerobic bacterial infections of the abdomen, pelvis, skin/soft tissue, bone/joint, CNS, lower respiratory tract, and bloodstream caused by susceptible organisms (e.g., Bacteroides species, Clostridium species, Fusobacterium species, Peptococcus/Peptostreptococcus species).
• Trichomoniasis (symptomatic and asymptomatic) in both male and female patients, including simultaneous treatment of sexual partners.
• Intestinal amoebiasis and amoebic liver abscess caused by Entamoeba histolytica.
• Surgical prophylaxis to reduce the incidence of postoperative infection in contaminated or potentially contaminated colorectal surgery.

Guideline-supported uses

• Bacterial vaginosis.
• Giardiasis (infection with Giardia duodenalis/lamblia).
• Clostridioides difficile-associated diarrhea (mild-to-moderate disease per some guidelines, though vancomycin/fidaxomicin are now generally preferred first-line).

Adjunct/combination-therapy uses

• Helicobacter pylori eradication, always used together with other antibiotics (e.g., clarithromycin or amoxicillin) and a proton pump inhibitor as part of a combination regimen — never as monotherapy for this indication.

Off-label uses (commonly used, not FDA-approved for this route/form)

• Certain dermatologic conditions such as rosacea (topical formulations); use only on a physician's advice.

Dosage of Metronidazole must be individualized according to the indication, patient age, weight, and renal/hepatic function. Take Metronidazole exactly as prescribed by your physician; do not stop, extend, skip doses, or share this medicine with others without medical advice.

Adult dosing by indication

Pediatric dosing

Pediatric dosing is weight-based and indication-specific (e.g., approximately 35-50 mg/kg/day in three divided doses for amoebiasis; lower doses for giardiasis). See Use in Special Populations and Pediatric Uses for details; a pediatrician should determine the exact dose.

Renal/hepatic adjustment

No dose adjustment is generally needed for mild-to-moderate renal impairment; dose reduction may be considered in severe renal impairment or hemodialysis (a supplemental dose may be needed after dialysis). In severe hepatic impairment, reduced doses and close monitoring are recommended because Metronidazole is extensively metabolized by the liver.

Common side effects of Metronidazole include:

• Metallic or bitter taste in the mouth (common, benign)
• Nausea, vomiting, loss of appetite, abdominal discomfort/cramping
• Diarrhea
• Headache and dizziness
• Dry mouth or glossitis (furry tongue)
• Darkened (reddish-brown) urine — harmless

Less common but important effects:

• Peripheral neuropathy (numbness, tingling in hands/feet) and CNS effects such as seizures and encephalopathy — rare, generally associated with prolonged or high-dose Metronidazole therapy; discontinue Metronidazole and seek medical attention if neurological symptoms occur (see Precautions and Warnings).
• Clostridioides difficile-associated diarrhea/colitis, ranging from mild diarrhea to severe colitis, which can occur during or after Metronidazole treatment.
• Rash, urticaria, and rarely severe hypersensitivity reactions.
• Leukopenia (usually reversible).