My blood pressure is a little low at times do to pacemaker syndrome or LV dysfunction. It is usually 115/68, but there are times when sitting for a long period it will drop to a systolic of 103. I asked my doctor if I could use viagra and he said he saw no reason I coudn't. I took it once (12.5 mg) and that seems to do the trick, but my wife is afraid that my blood pressure will drop to low. She is afraid the bottom will drop out. I also take 5mg of Accupril for helping to keep my blood pressure down throughout the day. It is a minor amount. If I take such a low dose of the viagra, does anyone know if it will drop my bp to dangerous levels sleeping after having sex at night or any other time after sex? - gle56