I thought that info about Tamiflu quite significant. I know a number of people who have bought Tamiflu and of course no one knows about that.
A similar principal applies to most antibiotics. That is why you are instructed to take the entire prescription as scheduled...even if you feel better before all of the prescription is consumed. Subclinical doses will just weed out the bacteria that are very sensitive. The rebound from the less sensitive population may not respond to that antibiotic at all.
Tamiflu distributed in Japan contains additional warnings about the possiblity of hallucinations as a side effect. Two Japanese teens who took Tamiflu committed suicide. It might be worthwhile to notify a trusted individual before taking a dose of Tamiflu in case you are one of the unlucky parties that experiences hallucinations as a consequence.