No, no pill is 100% effective at stopping pregnancy. The effectiveness depends on which pill you are referring to emergency contraception (morning-after pill) or the abortion pill (medication abortion) used to end an early confirmed pregnancy.
If you already have a confirmed pregnancy, the abortion pill (mifepristone and misoprostol) is highly effective about 95–99% effective in early pregnancy (up to 10–11 weeks) but no medical treatment is guaranteed to work 100% of the time.
At Serenity Choice Health, we provide safe, confidential medication abortion, telehealth abortion, and in-person abortion care, following strict clinical guidelines to ensure maximum safety and effectiveness.