My resting heart rate is usually around 80bpm. Since taking propanalol I have noticed it dropping with each tablet. The first time I took it it dropped to 70bpm. I'm now on day 4 of taking it and my bpm2had dropped to 66bpm. Now I'm aware it can do this but I just worry about it dropping too much. I know at the minute it is fine. I just don't like that in 4 days it has gone from 80bpm to 66bpm in the space of 4 days.