It's difficult to say. Medications that reduce your HR don't necessarily reduce your actual calories - it's just that your HR is no longer an indicator of caloric burn.
If you had gained 10lbs of fat in two weeks you'd have to have eaten an additional 2,500 calories per day over and above your actual needs - or an intake of something around 3700 - 4,000 depending on how high your range is.
So chances are it isn't fat.
So don't sweat it. It might go away yet. It could just be water retention or something.
Deb, in New Zealand
Fitness Minutes: (1,427)
5/5/12 8:34 P
Hi there! I frequently get occular migraines and just recently was put on a beta blocker, I had lost ten pounds before going on propanolol, and it's been two weeks on the meds and I've gained it all back. There's no hardcore evidence that it's the drug that's causing weight gain, but I HAVE noticed my heart doesn't beat nearly as fast when I'm working out... can the possibility of my heart no longer being able to reach my target zone during a workout be to blame for the weight gain?
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