Does lower blood pressure weaken the heart? bp used to be in the 130s-140s/80-90s and with valsartan 40mg i'm in the 110-118s/60-70s range (at rest). treating my sleep apnea and lost 20lb but does my heart lose ability to tolerate higher pressure?

Actually, the opposite is true. Controlling your blood pressure as you are doing it is better for your heart. You should keep your blood pressure under good control, as you’re doing, and continue weight loss if necessary. It will make your sleep apnea much better. Good job on the weight loss! Good luck.

Dissuade yourself of concerns, as you are achieving remarkable success. Your anti-hypertensive medication has placed you in a very normal range, and your weight loss has benefited sleep apnea control (assume you have a device for added success). You are on the right track. Continue your efforts!