Lisinopril
"I am a long-time sufferer of severe migraines, which interfere with my life. I take propanolol as preventative and Relpax for breakthough  4-6 times a month. My PCP prescribed small dose of Iisinipril in addition to help. No idea if drug would have helped migraines. First week, I had small outbreaks of hives I did not connect with lisinipril. Then I had an outbreak that within a day covered my entire body (there were plate sized hives that overlapped, with smaller outbreaks on top. My mouth and throat began swelling, and I got to ER asap. Very close to anaphylaxis. Learned that this is known side effect of Lisinipril. Package warning is not clear enough."