What chemicals are prearranged to motivation or mimic a heart attack when introduced into the body or bloodstream?

What chemicals are prearranged to motivation or mimic a heart attack when introduced into the body or bloodstream?
Viagra...Cialis, several other of these certain chemicals that create or oblige the erection by stimulating the penal gland into activity and more of a blood supply.
By tight-fisted, you can start a heart attack.
If your talking roughly speaking natural stuff I presume yew sap can mimic a heart attack. But if you take too much your unresponsive.