12-24 Hours
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Medicine Overview of Methebac 1gm Tablet
বাংলা
English
Indication
Asymptomatic bacteriuria, Treatment and prophylaxis of chronic, uncomplicated lower urinary-tract infections.
Adult Dose
Oral
Asymptomatic bacteriuria, Treatment and prophylaxis of chronic, uncomplicated lower urinary-tract infections.
Adult: As methenamine hippurate: 1,000 mg bid. In catheterised patient: 1,000 mg tid.
As methenamine mandelate: 1,000 mg 4 times daily.
Child Dose
Oral
Asymptomatic bacteriuria, Treatment and prophylaxis of chronic, uncomplicated lower urinary-tract infections.
Child: 12 yr: As methenamine hippurate: 1,000 mg bid. In catheterised patient: 1,000 mg tid. As methenamine mandelate: 1,000 mg 4 times daily.
Renal Dose
Renal impairment: Contraindicated.
Contraindication
Hypersensitivity. Gout, metabolic acidosis, severe dehydration. Renal and severe hepatic impairment. Concomitant use w/ sulfonamides or alkalinising agents.
Mode of Action
Methenamine is a urinary antibacterial agent. Its action depends on its conversion in acidic urine into formaldehyde, a nonspecific bactericidal agent, that is active against both gram+ve and gram-ve bacteria.
Precaution
Patient w/ indwelling urinary catheters; conditions wherein urine acidification is contraindicated or unattainable (e.g. presence of urea-splitting bacteria in the urine). Mild to moderate hepatic impairment. Childn. Pregnancy and lactation. Not intended for use in upper UTI. Monitoring Parameters Monitor urinalysis, urine culture, LFT. Maintain an acidic urine, or give supplemental acidification (e.g. ammonium Cl, ascorbic acid, methionine), if necessary.
Side Effect
1-10%
Dysuria
Gastric upset
Nausea
Rash
Pregnancy Category Note
Pregnancy Category: C
Lactation: excreted in breast milk; no adverse effects documented
Interaction
Acetazolamide may inhibit conversion of methenamine into formaldehyde.
Potentially Fatal: Risk of crystalluria when given w/ sulfonamides (e.g. sulfamethizole) or urinary alkalinising agents (e.g. potassium citrate).
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