Other ED pills stay active in the body for hours. This is not a complete list of side effects and others may occur. Cialis can be taken every 24 hours, but remember that the Cialis half-life is 36 hours. That means seven out of 10 people who take these drugs as prescribed will have more frequent or longer-lasting erections. You could get dizzy, faint or have a heart attack or stroke.The most common side effects with Cialis are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours. Men who get back pain and muscle aches usually get it 12 to 24 hours after taking Cialis. Back pain and muscle aches usually go away within 2 days. Daily tadalafil: or 5 mg daily pill. Tadalafil: 5 mg, 10 mg, or 20 mg, taken as needed. Cialis: mg, 5 mg, 10 mg, and 20 mg, taken as needed. The cost of the medication is from $ per. The most common side effects with Cialis are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours. Men who get back pain and muscle aches usually get it 12 to 24 hours after taking Cialis. Back pain and muscle aches usually go away within 2 days.