There is no way to obtain authentic Cialis without a prescription. Counterfeit medication is a huge problem, even in the US and some fake Cialis has been found to contain fiberglass and highway paint. Fortunately, easy to get Rx here.
Have had several PM questions about Cialis / Viagra / generic sildenafil so thought I'd clarify here...
Sildenafil is the generic name for Viagra; the usual dose is 50 or 100 mg an hour before intercourse. Sildenafil is also the generic name for Revatio which is used for a different disease (pulmonary hypertension) and the dose for that condition is 25 mg every six hours. Same drug but branded for different uses.
The patent for Viagra has not yet expired and each tablet costs about $40. The patent for Revatio has expired and each generic tablet costs about $1. The patent for Cialis runs for another 18 months or so I think so it's still expensive also. And, FWIW, you can use sildenafil daily in the same way Cialis is used (for BPH and / or ED).
So, you can buy generic sildenafil (previously branded as Revatio) 25 mg tablets and take one, two, three or four prior to intercourse.
See also
https://www.lpsg.com/threads/online-cialis.470148/#post-6432044