Quadriphasic versus monophasic oral contraceptives for contraception.

Quadriphasic oral contraceptives have been developed to reduce the adverse effects of oral contraceptives and are presented as more physiological since they mimic the natural cycle. However, suggested disadvantages of quadriphasic oral contraceptives include a possible increased risk of pill-taking errors caused by the array of different color pills, complicated directions for catching up when a pill is missed, the higher price and potential inferiority in terms of side effects.