That’s why it’s necessary to have a discussion with your physician before taking Viagra. Always speak together with your physician earlier than attempting supplements, as they might interact with medications you’re already taking. Viagra might cause blood pressure to drop, particularly within a couple of hours of taking it. It could stem from elevated blood circulate to the clitoris, labia, and different buildings of the female genitals. PDE5 is an enzyme that impacts blood move. That can be a problem if you have already got low blood stress or take medicines that decrease blood pressure. Women who take it might even have elevated blood circulate to the genitals. With increased blood stream to the penis, it’s easier to get and maintain an erection. We all know that in males, Viagra dilates blood vessels and increases the circulation of blood to the penis. Viagra is an ED medication that improves blood movement to the penis. The drug works by dilating blood vessels. For PAH: Sildenafil works by loosening up the muscles and opening up the veins in your lungs.