Tadalafil 20 mg is the active ingredient in Cialis, which is used to treat erectile dysfunction (ED) in men. The usual recommended dose is 10 mg, taken 30 minutes to 1 hour before sexual activity. For some men, a lower dose of 5 mg may be needed. Tadalafil 20 mg may last for up to 36 hours. This allows you and your partner to enjoy multiple sexual encounters over a period of time.
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