What is the best drug that can be used for abortion?

"Plan B" pills can prevent pregnancy if taken within 72 hours of having had sex. Any further along, and these will not work. Taking "miscellaneous" pills in the effort to achieve a do-it-yourself abortion are not going to work. What will occur is either birth defects to the baby, or multiple organ failure for yourself. PLEASE find yourself a free clinic / pregnancy crisis centre if you are pregnant and want to abort.