Positives

• A patient on low-dose atenolol (6.5–12.5mg twice daily) reported one full year without a PEM episode, going from needing a shower chair to gardening, walks, and light weight training — confirmed by stopping for 3 days and having PEM return Reddit.
  
  
• A HyperPOTS patient on atenolol for 2 weeks had 90% of symptoms under control with heart rate dropping to 70–95 bpm while upright, noting it worked the very first day Reddit.
  
  

Negatives

• A patient experienced adverse reactions including dim/blurry vision and soul-crushing fatigue, with symptoms worsening and their body appearing to refuse the medication on re-challenge Reddit.
  
  

Hurdles & Side Effects

• Atenolol is one of the cheapest generic beta blockers available, but POTS patients caution that its rate-slowing effect frequently comes at the cost of worsened fatigue, sleep disturbance, and exercise intolerance Health Rising.
• Patients on Drugs.com report struggling with fatigue, difficulty concentrating, and trouble staying awake during the day after starting atenolol, sometimes alongside cold extremities and shortness of breath Drugs.com.