Comparative Pharmacology
Head-to-head clinical analysis: MACRODANTIN versus UREX.
Peer-Reviewed Evidence
Head-to-head clinical analysis: MACRODANTIN versus UREX.
MACRODANTIN vs UREX
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Nitrofurantoin is reduced by bacterial flavoproteins to reactive intermediates that inhibit bacterial acetyl-CoA carboxylase, interfere with bacterial cell wall synthesis, and damage bacterial DNA. It is bactericidal against a broad spectrum of gram-positive and gram-negative bacteria.
Urex (methenamine hippurate) is hydrolyzed in acidic urine to formaldehyde and ammonia. Formaldehyde denatures bacterial proteins and nucleic acids, exerting a nonspecific bactericidal effect. The hippuric acid component maintains urinary acidity.
100 mg orally twice daily for 5 days; for uncomplicated UTI. Route: oral. Frequency: twice daily.
100 mg orally twice daily for 3 days (uncomplicated UTI) or 100 mg orally once daily for 5 days (prophylaxis).
None Documented
None Documented
20-60 minutes (prolonged in renal impairment, up to 8 hours in anuria)
Terminal elimination half-life is 14-18 hours in patients with normal renal function. In renal impairment, half-life is significantly prolonged (up to 40 hours in severe impairment), necessitating dose adjustment.
Renal: 30-40% unchanged, Hepatic metabolism: 60-70% to inactive metabolites, Fecal: <1%
Primarily renal: approximately 60-80% of the dose is excreted unchanged in urine via glomerular filtration and tubular secretion. Biliary/fecal elimination accounts for <5%.
Category C
Category C
Urinary Anti-infective
Urinary Anti-infective