...ective is the abortion pi...ffective. If you’re taking mifepristone and misoprostol, it depends on...how many doses of medicine you take: +96650518...or less, it works about 94-98% of the time. +9665051...gnant, it works about 94-96% of the time. +96650...0) If you take an extra dose of misoprostol, it works...