Tadalafil requires a prescription. Read more in our editorial policy. Is there a cheaper version of Cialis? How can I buy Cialis online? People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure.Get started. Get Cialis and Tadalafil pill online. Try the generic Cialis option for a fraction of the cost, after speaking with one of our online medical professionals. Cialis works well for most men on the first or second attempt. In a study of men taking Cialis, on average 81% of men using the 20mg dose found it improved erections. This . Generic Cialis Tadalafil (Cialis) Switch to brand medication info_outlined Used for Benign Prostatic Hyperplasia and Erectile Dysfunction MORE expand_more Check your .