I take Propanolol for panic attacks/rapid heart beat etc. Since i've been taking them the dosage has remained the same. I used to take 2 a day, or as needed. But I hardly ever take them now, maybe once or twice a week. I think the main thing that helped me with my anxiety was the anti depressant that im now using. I believe the anti depressant has helped my anxiety greatly, and instead of having a racing heart everyday its now few and far between, so I hardly ever need to take a beta blocker.