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PDE-5 inhibitors improve erections by relaxing the smooth muscles, allowing increased blood flow to the penis when you’re aroused. When prescribed for erectile dysfunction, Cialis works by relaxing the blood vessels in the body. This allows for increased blood flow to the penis, helping you to achieve and maintain an erection. Many people stop taking drugs because they are experiencing side effects, they no longer have a partner, or they are worried about safety. Sexual activity is not a major contributor to the risk of a heart attack. Sexual activity, with or without sildenafil (Viagra) increases the chance of an MI during sexual activity by only 0.1%.

Common side effects of Cialis include headaches, flushing, or a stuffy or runny nose, reflecting the effects of the drug on the blood vessels of the head and neck. Cialis, like all other PDE5 inhibitors, affects blood vessels and smooth muscle in other parts of the body, not just the penis