I Am Post Transplant 4yr Double Lung, On Rapamune, Cellcept,

I am post transplant 4yr double lung, on rapamune, cellcept, and predisone and am considering taking DHEA instead of androgel since testosterone levels are low. also have heart condition with 2 heart attacks one 17yr but another 2 yr......any suggestions. I plan on consulting Dr.s prior to taking but wonder if I should even ask.