Pretends to call from the US Government, wants to get an order number confirmed ... great, guess what !

Called telling me my order for Cialis was shipping. That would be great, if I'd ordered Cialis. The caller didn't seem to under phrases like "I didn't order anything" and "Don't call again".

It is totally frustrating.

HOWEVER...

What I have done is called my phone company, asked to be put on the Do Not Call list.  Then, I also went to http://www.rxdeliveredfast.com
Once you register your phone number, you have to wait 31 days but then you can file a complaint.

These people are persistent so no matter what you say to them they will not stop.  However, if enough of us complain to .gov well maybe it might stop.

The rxdeliveredfast.com domain has a Creation Date: 2015-01-12   It was created LAST MONTH!
The published expiration date is next January ... 11 months from now ... I guess they do not expect to be around too long
The real registrant's name and other info is protected by Privacy Inc, so we do not know who is running that operation.

In other words, that domain and whatever it is advertising is, most likely, a scam.  As with several "Canadian drugstores", the "drugs" may really be from India or other overseas location, and may not be what was expected.

You probably should read the info posted here:
http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm381534.htm