Known drug to drug interactions include:CyclosporineFemale hormones, like estrogens or progestins and birth control pillsMedicines for diabetesSome medicines for seizuresSteroid medicines like prednisone or cortisoneCancerous growths such as tumours (although this has never been medically proven only medically speculated)This list may not describe all possible interactions. Before application of HGH therapy, give a medical doctor or health care provider a list of any and all current ailments you may have along with all the medicines, herbs, non-prescription drugs, or dietary supplements you are currently using for further determination.