What are the side effects for taking oral MS drugs as opposed to copaxone (glatiramer) and all the other injectable drugs.

Complex . All ms drugs have potential side effects, and Copaxone has injection site reactions, lipoatrophy, an occasional chest/flushing reaction, and of course, the need to inject. All three orals are well tolerated in most folks, but tecfidera may cause severe nausea, diarrhea. Better tolerated might be Gilenya (fingolimod) or aubagio. Talk to neurologist about your best approach.
Numerous difference. I'll apologize in advance, but healthtap limits my responses to 400 characters. Your best bet is to visit the website for each of these drugs and review the information yourself. You may also learn about incentive programs from pharmaceutical companies if you do so. At the end of the day, they all have side effects.