All three medication abortion regimens can be used safely and
effectively throughout early pregnancy. However, all three regimens
are most effective when used at earlier gestational ages. The
mifepristone and misoprostol regimen and misoprostol alone can both be
used through the first nine weeks of pregnancy. The methotrexate
and misoprostol regimen is most effective when used in the first seven
weeks of pregnancy but studies have shown that the regimen continues
to work during the eighth week of pregnancy.