I don't know and haven't looked up Atenolol, is it a beta blocker?
It is best no to change you dose of any medication without consulting your doctor, but I'm sure you know that. Many of us try varying the dose if the medication gives us some unpleasant side-effects, such as low BP with a beta blocker.
Given you only reduced the dose, I doubt very much that you did any damage to your heart. But, I believe going "cold turkey" on beta blockers should not be done, that said I"m not sure the doctor has never done that with me. I've taken Metoprolol off and on over the years (on right now) and I may have been told to just stop taking it in the past. I know I have varied my dose from as much as 200 mg a day to 100 mg a day in one step. This was with consultation with my doctor.
Atenolol is a beta blocker. I tried to reduce due to drop in BP, but I will not do that again. I'll just split the tablet in two doses. The nurse I talked to in my Dr.'s office told me not to lower the dose. My heart rate is still high, so I guess I need to stay on. I see my doc in February, so hopefully I'll have my BP under control by then (through exercise). I'd like to stop this one day. I've read that perhaps atenolol can increase your risk for diabetes and my fasting glucose has increased 10 points over the last year. Is 103, which is considered prediabetic. Anyone ever heard of this. This concerns me. Thank you.
How low is low on the BP?
My BP got to 106/68 at night. I woke up with slight tachycardia, I think to correct BP. This may not be that low, but felt low to me. I take my atenolol around 5 pm.