Descriptions
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Indications
Metronidazole is indicated in the treatment of following diseases:
- The prevention of post-operative infections due to anaerobic bacteria (particularly species of bacteroides and anaerobic streptococci).
- The treatment of septicaemia, bacteraemia, peritonitis, brain abscess, pelvic abscess, pelvic cellulitis and post-operative wound infections caused by anaerobes.
- In the treatment of urogenital trichomoniasis.
- Bacterial vaginosis (also known as non-specific vaginitis).
- All forms of amoebiasis (intestinal, extra-intestinal disease and that of symptomless cyst passers).
- Giardiasis.
- Acute ulcerative gingivitis.
- Anaerobically infected leg ulcers and pressure sores.
- Acute dental infections due to anaerobic organisms.
- Antibiotic associated pseudomembranus colitis.
Pharmacology
Metronidazole is a member of the imidazole class of antibacterial drug and is classified therapeutically as an antiprotozoal agent. The 5-nitro group of Metronidazole is reduced by anaerobes metabolically. Studies have demonstrated that the reduced form of this drug interacts with DNA and gives bactericidal action of Metronidazole.
Dosage & Administration
Tablet and Suspension:
Trichomoniasis (Adults & Children over 10 yrs)-- 200 mg tid or 400 mg bid for 7 days
- 800 mg in the morning and 1-2 gm at night for 2 days
- 2 gm as a single dose for 1 days
- Children 7-10 yrs: 100 mg tid
- Children 3-7 yrs: 100 mg bid
- Children 1-3 yrs: 50 mg tid
- 800 mg tid for 5 days
- Children 7-10 yrs: 400 mg tid
- Children 3-7 yrs: 200 mg qid
- Children 1-3 yrs: 200 mg tid
- 400-800 mg tid for 5-10 days
- Children 7-10 yrs: 200-400 mg tid
- Children 3-7 yrs: 100-200 mg qid
- Children 1-3 yrs: 100-200 mg tid
- 2 gm once daily for 3 days
- Children 7-10 yrs: 1 gm once daily
- Children 3-7 yrs: 600-800 mg once daily
- Children 1-3 yrs: 500 mg once daily
- 200 mg tid for 3 days
- Children 7-10 yrs: 100 mg tid
- Children 3-7 yrs: 100 mg bid
- Children 1-3 yrs: 50 mg tid
- 200 mg tid for 3-7 days
- 400 mg bid for 7 days
- 2 gm as a single dose for 1 days
- 400 mg tid for 7 days
- 800 mg initially and then 400 mg tid for 7 days
- Children 1-10 yrs: 7.5 mg/kg tid
- 400 mg tid started 24 hours before surgery for 1 days
- Children 1-10 yrs: 7.5 mg/kg tid
Vaginal Gel:
The recommended dose is one applicator full of Metronidazole gel (approximately 5 grams containing approximately 37.5 mg of Metronidazole) intravaginally once or twice a day for 5 days. For once a day dosing, Metronidazole gel should be administered at bedtime.
Suppository:
Anaerobic Infections-- Adults: 1 g every 8 hours for 3 days, then 1 g every 12 hours.
- Children: 5-10 years: 500 mg every 8 hours for 3 days, then every 12 hours, Over 10 years adult dose.
- Adults: 1 g 2 hours before surgery; up to 3 further doses of 1 g may be given every 8 hours for high risk procedures.
- Children: 5-10 years: 500 mg 2 hours before surgery; up to 3 further doses of 500 mg may be given every 8 hours for high risk procedures.
IV Infusion:
Metronidazole intravenous infusion requires no dilution and should not be mixed with any other drugs prior to administration.- Adults and children over 12 years: Infuse 500 mg 8 hourly at a rate of 5 ml/minute and a maximum of 4 g should not be exceeded during a 24-hour period. Treatment for 7 days is sufficient for most patients, but treatment can be extended, especially for cases where reinfection is likely. For surgical prophylaxis, administration shortly before surgery should be followed by 8-hourly doses for the next 24 hours.
- Children under 12 years: 7.5 mg/kg body weight/day every 8 hours at a rate of 5 ml/minute.
Interaction
- Disulfiram: Psychotic reactions have been reported in patients who were using metronidazole and disulfiram concurrently.
- Alcohol: Alcoholic beverages and drugs containing alcohol should not be consumed during therapy and for at least one day afterwards because of the possibility of a disulfiram-like (antabuse effect) reaction (flushing, vomiting, tachycardia). Oral anticoagulant therapy (warfarin type): Potentiation of the anticoagulant effect and increased hemorrhagic risk caused by decreased hepatic catabolism. In case of co-administration, prothrombin time should be more frequently monitored and anticoagulant therapy adjusted during treatment with metronidazole.
- Lithium: Plasma levels of lithium may be increased by metronidazole.
- Cyclosporin: Serum cyclosporin and serum creatinine should be closely monitored when co-administration is necessary.
- Phenytoin or phenobarbital: increased elimination of metronidazole resulting in reduced plasma levels.
- 5-Fluorouracil: Reduced clearance of 5-fluorouracil resulting in increased toxicity of 5-fluorouracil.
- Busulfan: Plasma levels of busulfan may be increased by metronidazole, which may lead to severe busulfan toxicity.
Contraindications
Metronidazole is contraindicated in patients with a history of hypersensitivity to Metronidazole or other Nitroimidazole derivatives.
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