supraventricular tachycardia
"Started taking metoprolol 8 years ago when I was hospitalized with a bout of of tachycardia that wouldn't go away for hours. Diagnosed with supraventricular tachycardia. Started out at 50mg, but had breakthroughs regularly, and went up to 100mg after a year. The medication works great to keep my heart rate and blood pressure down to normal levels, however, for the first month on the medication I constantly fell asleep during daily activity, and even now I maintain a sense of perpetual fatigue. Hard to lose weight, and depression creeps up often. Brain fog has slowed my ability to focus and react swiftly, which is frustrating. Still, the medication works so well to keep the heart episodes at bay that I haven't tried switching to a new medication."