Prediction of in vivo bioavailability of six brands of ciprofloxacin film coated tablets using the concept dissolution efficiency (DE).
A comparative in vitro dissolution efficiencies (DE) of six commercial brands of ciprofloxacin tablets were evaluated in acetic acid and phosphate buffer (pH 7.4) and results obtained were used in ranking of their probable in vivo bioavailability. The dissolution efficiencies (DE) of the six brands varied widely in the two media. This was attributed to differences in solubility of the drug in the two media. The dissolution efficiencies of five out of the six brands (Citrovenot, Ciproxin, Cipoxin, Ciproflox, and Quflox), in 0.1 N acetic acid fell within 60-75% at 30 minutes, and therefore, could be considered bioequivalent. The dissolution efficiency of a brand, Cipro, fell below 40% in the same medium and at the same sampling time and it was considered to be most likely less bioavailable in vivo. There was absence of correlation between the hardness and disintegration time of the brands with their dissolution efficiencies.
Ofoefule
S I
SI
Department of Pharmaceutical Technology and Ind. Pharmacy, University of Nigeria, Nsukka, Enugu State, Nigeria.
Udeogaranya
P O
PO
Okonta
J M
JM
D001682:Biological Availability; D002511:Cephalosporins / Q000008:administration & dosage / Q000493:pharmacokinetics*; D002939:Ciprofloxacin / Q000008:administration & dosage / Q000493:pharmacokinetics*; D012995:Solubility; D013608:Tablets, Enteric-Coated
D002511:Cephalosporins; D013608:Tablets, Enteric-Coated; D002939:Ciprofloxacin