Medical abortions before week 8 in 2015 were ~25% of all abortions performed in the US.
They are riskier than surgical procedures
A good resource explaining the differences
Complications
ProLife
A medical (or chemical) abortion is a non-surgical form of abortion in which the woman takes pills containing Mifepristone (RU-486) and Misoprostol (or Cytotec) to end the life of the baby. This procedure is performed during the first trimester of pregnancy. The drugs are approved by the FDA for use up to ten weeks since the first day of her last menstrual period (LMP).https://www.abortionprocedures.com/abortion-pill/
ProChoice
Planned Parenthood advertisement for RU486You MUST never take RU486 without proper medical supervision
A good resource explaining the differences