I don't know what drug that is...but do not buy prescriptions online. I watched a documentary on it, and you never know what you're getting. There's a reason prescriptions are required. Don't trust anything like that you buy off the internet.
Good luck finding one. There are thousands of bogus sites on the internet selling impotence drugs. They are almost always unregulated and dangerous - you never know what you'll be getting.
You didn't mention why you can't go to the doctor and ask for a prescription for this, but I would highly recommend you do if you feel you have a genuine problem maintaining erections. If it's simply a case of being too embarrassed to go, don't be - doctors will have seen hundreds of men with erectile dysfunction and will handle your case with calm professionalism.
Even if you're lucky enough to buy genuine Cialis online, without going to your doctor, you won't know if you're a good candidate for that particular medicine. Surely better to visit a reputable doc who can tell you the best course of action than to take something that may or may not be the real deal, and may or may not cause an allergic reaction or severe side effects.
there are quite many sites offering meds online, but a large number of them are not good.. so pick very carefully, there sure are many great ones as well
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a few helpful websites:
onlinerxsaver.com - a cheap and realiable pharmacy site where I buy generic meds
webmd.com - a very good source for any health related information
drugs.com - a very good source for prescription information and directions
that transfers to Canada 
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