After my very first fib episode I was prescribed 25mg of metoprolol, which made me feel somewhat tired, but nothing I couldn't push through. After a few more Afib episodes over 6-8 months (during which I would take an additional 25mg of metoprolol in an attempt to slow things down), the dose was increased to 50mg, then to 75mg, which made me feel fatigued and zombie-like much of the time..., plus my resting HR often dropped below 50bpm. And just to make my situation more complex, my Afib condition occurred while I was also experiencing lingering covid symptoms (months). The best way I could describe metoprolol side effects is that it felt like I was going through life fighting a headwind. Not pleasant.

There's a bit more my metoprolol story...I had a PF ablation, was prescribed a CPAP device for sleep apnea, and reduced my metoprolol to 25mg a day, which I tolerate pretty well. Since then no Afib episodes (touch wood), and feeling less fatigued. Doc says that if my resting HR dips below 50 a lot, I should stop the metoprolol altogether.

I never figured out how much of my unwell-ness was metoprolol side effects, long covid, sleep apnea, or Afib...or something else?