Evaluate Effects of Multiple Doses of Rifampin and Clarithromycin on the Single Dose Pharmacokinetics of Deflazacort

Deflazacort, a glucocorticoid with anti-inflammatory and immunosuppressive effects, is used in treating a variety of diseases. Pharmacologically it is an inactive pro-drug which is metabolized completely and rapidly to the active drug 21-desacetyldeflazacort (21 desacetyl-DFZ). The elimination of this metabolite is primarily via the urine in humans. Its potency is approximately 70 to 90% of prednisone and 6 mg of deflazacort has approximately the same anti-inflammatory potency as 5 mg of prednisolone or prednisone. Rifampin is a potent inducer of drug metabolism by inducing a variety of hepatic and intestinal CYP enzymes, especially CYP3A4. Rifampin is a semi-synthetic antibiotic.

Deflazacort, a glucocorticoid with anti-inflammatory and immunosuppressive effects. It is an inactive pro-drug which is metabolized completely and rapidly to the active drug 21 desacetyl-DFZ. The elimination of this metabolite is primarily via the urine in humans. Its potency is approximately 70 to 90% of prednisone. Clarithromycin is a semi-synthetic macrolide antibiotic. Clarithromycin is active in vitro against a variety of aerobic and anaerobic gram-positive and gram-negative bacteria as well as most mycobacterium avium complex (MAC) bacteria. Additionally, the 14-OH clarithromycin metabolite also has clinically significant antimicrobial activity. Clarithromycin is indicated for the treatment of mild to moderate infections such as pharyngitis/tonsillitis.