Each participant of the campaign should have a small personal first aid kit and know how to use the preparations included in it. The main component of such a first-aid kit is medicines for your diseases. No one knows better than you and your doctor how to deal with them. Be sure to tell your coordinator and guide about your illnesses and what medications you are taking.
If you have any doubts about your health before you go, be sure to consult a doctor.
Take Diamax (Diacarb) and/or Hypoxen for climbing and trekking at altitudes over 5000 m. For long hikes take vitamin complexes additionally, you can start taking them a week or two before the start.
Each guide has a big group first-aid kit, you can find it here.