have been taking sildenafil for approx five years (I am 71) for ED with good results. Approx 8 months ago began taking HCT 25 mg every AM as a substitute for a 1/2 tablet of metoprolol to reduce somewhat high potassium ; still take the 1/2 25 mg metoprolol in PM. For several months the sildenafil seems less effective (difficulty achieving orgasm, though have erection). Is the diuretic effect of the HCT a potential issue that I should discuss with my physician? Thank you !