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Effects of aluminum and magnesium antacids and ranitidine on the absorption of ciprofloxacin
Author(s) -
Nix David E,
Watson William A,
Lener Michelle E,
Frost R Wayne,
Krol George,
Goldstein Harvey,
Lettieri John,
Schentag Jerome J
Publication year - 1989
Publication title -
clinical pharmacology and therapeutics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.941
H-Index - 188
eISSN - 1532-6535
pISSN - 0009-9236
DOI - 10.1038/clpt.1989.207
Subject(s) - antacid , ranitidine , ciprofloxacin , absorption (acoustics) , pharmacology , bioavailability , oral administration , medicine , crossover study , ciprofloxacin hydrochloride , chemistry , antibiotics , biochemistry , pathology , acoustics , placebo , physics , alternative medicine
The effect of an antacid (Maalox) and ranitidine administration on the absorption of ciprofloxacin was evaluated in healthy male volunteers who were enrolled in three separate studies. Each study was designed as a three‐ or four‐period crossover and included the administration of 750 mg ciprofloxacin alone as a control treatment. Treatments that were evaluated included the administration of ciprofloxacin 5 to 10 minutes, 2 hours, 4 hours, and 6 hours after a single 30 ml dose of antacid; the administration of antacid 2 hours after ciprofloxacin was given; and the administration of ciprofloxacin 2 hours after a 200 mg ranitidine tablet. Administration of antacid within 4 hours before ciprofloxacin dose resulted in a significant decrease in ciprofloxacin absorption ( p < 0.05). Percentages of relative bioavailability compared with control values were 15.1%, 23.2%, and 70% for the 5 to 10 minute, 2 hour, and 4 hour antacid pretreatments, respectively. Administration of antacid 6 hours before or 2 hours after the ciprofloxacin dose did not affect absorption. Ranitidine did not alter ciprofloxacin absorption. Antacids that contain magnesium and aluminum salts may reduce the absorption of ciprofloxacin. The extent of this interaction appears to increase as the time between administration of the two drugs decreases. Ranitidine is suggested as an alternative to antacids for patients receiving treatment with ciprofloxacin. Clinical Pharmacology and Therapeutics (1989) 46 , 700–705; doi: 10.1038/clpt.1989.207