When you are on a prescription or over-the-counter drug, did you know that the remnants of that product end up in the sewage system? This isn't rocket science, after all -- what goes in comes out (in some form, anyway).

It's been found that modern sewage systems don't break down the Tamiflu flu-prevention drug, which results in components of the drug ending up into natural waters where certain viruses may have more exposure to it -- causing resistance after a while.

In other words, the overabundance of Tamiflu could lead to flu-resistant viruses in the future at precisely the time a flu pandemic would emerge -- not exactly the best-case scenario. Researcher Bjorn Olsen stated that "Antiviral medicines such as Tamiflu must be used with care and only when the medical situation justifies it." So, do you 'really' need that Tamiflu prescription?