Published on: 1 November 2015
How effective is 20mcgEE/3mgDRSP as contraception?
20mcgEE/3mg DRSP is of comparable effectiveness to other combined oral contraceptives. [1,2,3] A large US observational study reports lower failure rates amongst users of a 24/4 EE/DRSP regimen than a 21/7 EE/DRSP regimen. The study also suggests greater contraceptive effectiveness of a 24/4 EE/DRSP regimen than with a 24/4 regimen containing EE in combination with norethisterone.
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