I got a heart transplant but the medicine is too strong. what can happen if i don't take them?

Bad things: If you are talking about the immunosuppressive medicines very bad things can happen. If you stop your immunosuppression the organ will be rejected and will eventually fail. If that happens with a heart you will die. If they are other medications the results of not taking them would depend on what they are. I urge you to discuss this with your transplant team immediately.

A bad outcome: Discuss this directly with your heart transplant team immediately. Do not change your medications on your own.

Rejection: If you have a transplant, then don't take your transplant meds to prevent rejection, the risk is, of course, rejection of your transplant. That is a whole lot of money wasted, and an organ that could have gone to someone else. See your doctor immediately, and don't stop your medication.