Effect of Gasex, a herbomineral formulation on the bioavailability of ciprofloxacin was studied in six healthy male volunteers. On day one, single dose of ciprofloxacin (500 mg) was given at fasting state and the plasma Concentrations of ciprofloxacin were estimated after 1, 2 and 4 hr. On day 8 ciprofloxacin (500 mg) was given along with 2 tablets of Gasex and the plasma concentrations of ciprofloxacin estimated at the same time points. No significant difference in the plasma ciprofloxacin levels was found in these two treatments, indicating that the bioavailability of ciprofloxacin was not affected by simultaneous treatment with Gasex.