Metronidazole

Generic Name:

Metronidazole

Therapeutic Category:

Antiprotozoal / Antibacterial (Nitroimidazole derivative)

Mechanism of Action:

Metronidazole enters anaerobic microbial cells via passive diffusion. Once inside, the nitro group of the molecule is chemically reduced by intracellular electron transport proteins (like ferredoxin). This reduction creates short-lived, highly reactive nitro-free radical intermediates that bind to bacterial and protozoal DNA, disrupting its helical structure and causing strand breakage, which leads to rapid cell death.

Indications (Therapeutic Uses)

Metronidazole Oral Suspension is an oral liquid formulation frequently used for pediatric patients and adults who have difficulty swallowing tablets. It specifically targets anaerobic bacteria and protozoal infections:

Amoebiasis: Treatment of acute intestinal amoebiasis (amoebic dysentery) and extraintestinal amoebiasis (such as amoebic liver abscesses) caused by Entamoeba histolytica.
Giardiasis: Eradication of small intestinal infections caused by the parasite Giardia lamblia, a frequent culprit behind traveler’s diarrhea and waterborne outbreaks.
Trichomoniasis: Treatment of symptomatic and asymptomatic urogenital infections caused by Trichomonas vaginalis.
Anaerobic Bacterial Infections: Management of deep tissue infections, intra-abdominal infections, pelvic inflammatory disease, and aspiration pneumonia caused by susceptible anaerobic organisms (e.g., Bacteroides fragilis, Clostridium species).
Acute Dental Infections: Alleviation of severe pericoronitis, acute apical infections, and acute ulcerative gingivitis (trench mouth).

Dosage & Administration

Website Note: The exact volume, strength (commonly 200 mg / 5 mL), frequency, and length of treatment must be calculated by a registered medical practitioner based on the patient’s body weight, age, and type of infection. The full course must be finished even if symptoms improve early.

Standard Adult Dose: Varies greatly by indication. For example, Giardiasis typically requires 2,000 mg once daily for 3 days, while Anaerobic Infections generally call for 400 mg to 800 mg three times daily for 7 to 10 days.
Standard Pediatric Dose: Calculated explicitly on body weight (e.g., 35 mg/kg to 50 mg/kg per day divided into three doses for amoebiasis).
Administration Method: Shake the bottle thoroughly before each use to guarantee the sedimented active drug particles are evenly re-suspended. Use a calibrated oral dosing syringe or medicine cup to measure the exact milliliter volume.
Timing: Take either one hour before or during a meal. Taking it with food can help buffer the stomach and ease gastrointestinal irritation.

Contraindications & Precautions

Absolute Contraindications: Do not use in individuals with a verified history of hypersensitivity to metronidazole, other nitroimidazole derivatives (e.g., tinidazole), or any inactive ingredients in the liquid suspension. Completely contraindicated during the first trimester of pregnancy for treating trichomoniasis.
The Disulfiram-Like Reaction (Alcohol Warning): Conversion or consumption of alcohol is strictly forbidden during metronidazole therapy and for at least 48 to 72 hours after finishing the final dose. Metronidazole inhibits the enzyme acetaldehyde dehydrogenase. Mixing it with alcohol results in an accumulation of acetaldehyde, triggering a severe reaction characterized by intense abdominal cramps, facial flushing, nausea, vomiting, palpitations, and throbbing headaches. Be mindful of hidden alcohol in certain cough syrups or mouthwashes.
Central Nervous System (CNS) Toxicity: Metronidazole can cause severe neurological complications. Use with extreme caution in patients with active central nervous system disorders (like multiple sclerosis or epilepsy). Discontinue treatment immediately if ataxia (loss of muscle coordination), dizziness, confusion, peripheral neuropathy (numbness/tingling in hands or feet), or seizures occur.
Blood Dyscrasias: Metronidazole is a nitroimidazole and can occasionally cause mild, transient leukopenia (low white blood cell count). Avoid use in patients with a history of blood dyscrasias, or monitor blood counts closely if prolonged therapy is required.
Hepatic Impairment Adjustments: Metronidazole is extensively metabolized by the liver. Patients with severe hepatic insufficiency (liver failure or advanced cirrhosis) metabolize the drug significantly slower, increasing the risk of systemic accumulation and toxicity. Dose reductions are mandatory.

Potential Side Effects

Common / Mild: An unpleasant, persistent metallic taste in the mouth, nausea, vomiting, diarrhea, abdominal discomfort, loss of appetite, headache, dizziness, and a harmless cosmetic darkening of the urine (dark brown or reddish-brown coloration).
Less Common / Severe: Peripheral neuropathy (numbness, tingling, or burning in extremities), generalized convulsive seizures, encephalopathy, ataxia, severe hypersensitivity (anaphylaxis, angioedema), and severe skin reactions (such as Stevens-Johnson syndrome).

Metronidazole

Generic Name:

Therapeutic Category:

Mechanism of Action:

Indications (Therapeutic Uses)

Dosage & Administration

Contraindications & Precautions

Potential Side Effects

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