Two micronized oral formulations of medroxyprogesterone acetate (MPA) (Farlutal and Clinovir) were compared in order to evaluate their relative bioavailability. Sixteen female patients with metastatic breast cancer were entered in a randomized cross-over study on 500-mg MPA tablets repeatedly administered (twice daily for 20 days). At the steady state, similar mean +/- SD serum levels of MPA were obtained (131 +/- 44 ng/ml for Farlutal and 136 +/- 45 ng/ml for Clinovir) and the two formulations proved to be bioequivalent (confidence interval at a significance level of 0.95 = 93%-107%).
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