Protease inhibitors: Amprenavir, lopinavir, nelfinavir, and ritonavir have been shown to decrease plasma levels of combination hormonal contraceptives;
<Amprenavir, mechanism, combination hormonal contraceptives>, <lopinavir, mechanism, combination hormonal contraceptives>, <nelfinavir, mechanism, combination hormonal contraceptives>, <ritonavir, mechanism, combination hormonal contraceptives>