What drugs can be used to help during procedures?

Supportive care Rx. I assume you mean to deal with the side effects. There are many developed over the years. The most successful have been those to combat nausea and vomiting. There are others that support the normal bone marrow to help reduce infection, many drugs to prevent infection by bacteria, fungus and viruses, fluids and food supplements. Your medical team will help decide which ones you need.