angina
"I've been taking it for three months.  I haven't used a nitro in that time. The chest pain I experienced in breathing cold or humid air, or after climbing, or even after stress has dissipated to an unexpected and happy extent. However, the side effects are bothersome, though not insurmountable.  Dry mouth, almost continuously, which sometimes affects ability to speak clearly. Constipation, overcome by hard bowel movements, use of stool softeners. And just a general feeling of stuffiness, in body, in sinuses, elsewhere.  Hard to say whether I would recommend it. The annoyances at times are major; the feeling of freedom from the chest pain and fear greatly offset the annoyances so far.  Incidentally, I am 77, with only one open artery."