how often can you take cialis
Report Abuse. Cialis is an oral erectile dysfunction drug that treats the ED (erectile dysfunction) by increasing the blood inflow to the penile tissues. The usage of Cialis is effective for around 36 hours from the start of its intake whereas, the effectiveness of other drugs stays for at the most 12 hours. To start the dosage of the drug one needs to have prescription. Such a prescription can be from a doctor or an online source.