You are on call and bored so you go and hang out in the ER and a patient comes in with c/o a new-onset angina and reaches in his pocket and takes his "BP medication" in front of you, you think your golden, and ask "did you just take your NTG". The patient says "I don't take NTG, its something else". All of a sudden the patient says "it feels like the pain is gettin worse", has a full blown MI and codes right in front of you, what did the patient take?

Give me the class of drug and reason why the MI happened.