Hydralazine
"I took Hydrazine 50mg on January 11, 2017.  It felt like someone had given me a shot of Morphine. This med messed me up. My heart rate was 122 my chest hurt and I had difficulty breathing. I was dizzy, tired, and sleepy and immediately called my Cardiologist and reported my side effect. I was told to take 50mg of Metoprolol so it would lower my heart rate. My legs and arm muscles hurt and I will never take this medication again."