The most common side effects of Misoprostol and Mifepristone pills use for abortion [1] are pain (uterine cramping) and vaginal bleeding, although these are the intended effects of the medications. Other possible side effects [2] include: fevers, chills, nausea, vomiting, diarrhea.
Sources
[1] Planned Parenthood. What can I expect after I take the abortion pill? Retrieved from: https://www.plannedparenthood.org/learn/abortion/the-abortion-pill/what-can-i-expect-after-i-take-the-abortion-pill
[2] Gynuity. Providing medical abortion in low-resource settings An Introductory Guidebook. Second Edition. 2009. Retrieved from: https://gynuity.org/assets/resources/clinguide_maguide2nd_edition_en.pdf