Maybe you’re wondering why a man would take anything other than Cialis for erectile dysfunction. The reported effectiveness of Viagra is 84%, while the reported effectiveness for Cialis is slightly lower, at 81%. Many men want to try Cialis, however because of its longer half-life.
Doctors advise erectile dysfunction patients to take Cialis 30 minutes before anticipated sexual activity, compared to the one-hour lead time many doctors recommend for Levitra and Viagra. With an 18-hour half-life, a man could theoretically take Cialis on a Friday night, and still feel its effects on Sunday. That’s been a huge selling point for Cialis.