98% EFFECTIVE: When used as directed, this daily birth control pill is 98% effective at preventing unwanted pregnancies.OTC BIRTH CONTROL PILL: Opill is the most effective over the counter contraception for women and people who can become pregnant.DAILY PILL: Effective at preventing pregnancy in just 48 hours after you begin taking it; it must be taken within the same 3-hour window each day; Opill does not delay your ability to get pregnant once you choose to stop taking it.NO PRESCRIPTION NEEDED: Opill is available online and over the counter without a prescription. No doctors, no appointments, no hassle. Please read the leaflet when switching from another hormonal method of contraception.ESTROGEN FREE: This birth control pill's progestin-only, estrogen free formula is suitable for people who are breast-feeding, smokers over 35 years of age and females with hypertension.