My fiance is taking cyproterone mylan 50mg and provames estradiol 1mg daily prescribed for other reasons. can we rely on those as a prevention method?

Not forever: If your fiance is male, no. If female then yes. -Severe acne in women that has not responded to treatment with oral antibiotics. -Abnormal hair growth in women as a result of excessive production of male sex hormones (hirsutism). -This medicine will also provide contraception for women taking it for acne or hirsutism, but it should not be used solely as a contraceptive