I believe it is from a "company" selling generic viagra and other "medications" without the requirement of a doctor's prescription. No idea as to their trustworthiness.
Just some tips on these nuisance calls. Some will work for you and some won't, depending on what type of phone line/service you have. I employ 4 different things. #1 called a Tele-Zapper (available on-line or Ebay), it filters calls from MLM, telemarketers and repeat callers (that you program to auto-reject). #2--I purchased one of those hi-frequency dog whistles (supposedly only dogs can hear), but if it's a human being, on the other side, you will lietrally blow their ear drums out. #3 I programmed my Samsung Iphone to auto reject any calls, from unknown #s or that call and don't leave a message. The last one is the easiest of all. I subscribe to a "bundle" from Century Link, that provides me w/ listed landline # and after programming my cell to reject any/all calls, not on my known callers' list, all calls going to the landline, actually go into limbo, since there's no phone physically connected to that number and you're able to see who's calling you on your TV or computer screen and you can then decide if you want to call back or not.
Canadian pharmacy garbage...I asked politely to remove my number, I've used profanity, i even called them back repeatedly throughout the day also using profanity. They stopped calling for a couple months, looks like its starting again. I think next time; I will waste their time by making large orders, after checking out all of their inventory first, of course. I wonder if giving them fake credit cards is illegal ?