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The active ingredient in Cialis is tadalafil and sildenafil in Viagra.Both treatments are helpful in achieving and maintaining erections during sexual activity. Viagra and Cialis on-demand are consumed as needed before sexual activity. Cialis Daily is another form of tadalafil that is taken once daily, regardless of sexual activity frequency.

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