angina
"I have been taking isosorbide mononitrate 30mg tablets for a little over 2 months now. For the first 4 to 5 days I did experience headaches, however, they did subside. I have, now, started to experience a headache every now and again though. I have, also, started to have the same chest pain, again, which had completely gone away until now. My biggest complaint and concern is that I find myself EXTREMELY tired, every single day, for the past 2 weeks! It does not matter if I sleep 8 or more hours I still wake up feeling like I have had no sleep at all! I can sit down on my couch or at the kitchen table and fall asleep sitting straight up and have slept that way for hours! I don't understand this but other that that I'm ok with the medicine."