If you forgot to take mifepristone 50 mg one day, you can take the pill the next day.
If mifepristone 50 mg is forgotten for two days or more, a pill must still be taken and condoms must be used during sexual intercourse for the next 7 days.
An additional pregnancy test three weeks later is then important to do. Then continue using mifepristone 50 mg on the fixed day.