First, baseline hearing and vision screenings since some meds can cause problems with these. Then one med at a time, preferably for one or two weeks. That way if you react badly. Depending on the "cocktail" prescribed, the doctor can advise on the order to try.

There may be nausea, loss of appetite, or altered taste sensation, so figure out what foods appeal and offer them in frequent, small amounts. Concentrate on high density nutrition, protein and calories - nuts, dairy if tolerated, protein shakes or smoothies...

Also ask to have help on-hand for excessive nausea or diarrhea if they occur, so you can treat quickly.