Percocet used for pain relief is a narcotic medication and prescriptions can prevent people from getting high on Percocet without medical reason.In fact, the Percocet high feeling can get you into lots of problems.
I think the formula of the perfume itself decides how fast it will spoil. My perfumes from Britney Spears Curious and Salvatore Ferragamo went bad within a year and a half. The Britney Spears one developed some precipitation and started smelling like alcohol, while the Salvatore Ferragamo just smelled plain weird.
It may seem like a good idea to store perfume in a refrigerator, where it is safe from all heat and light. However, this method can be just as bad for perfume: The constant temperature fluctuations from removing the perfume from the fridge to use it and then replacing it will destroy the perfume.