It is actually against the law to give it any one medication even if the prescription is exactly the same.
It never seems like a big deal either way.
If the FDA sponsored a system of legal and regulated prescription drug buying from Canada, this would force American pharmaceutical companies to drop their prices by 80 to compete, resulting in a better situation for the consumer. As type 5 phosphodiesterase (PDE-5) inhibitors are the main active ingredients in Viagra, Cialis and Levitra, the US Food and Drug Administration (FDA) has issued a news release to advise healthcare providers of the potential risk. Tadalafil should be used cautiously in patients with bleeding disorders or active ulcers.