What is the best method of storing pills (Xanax, Valium, ect)..?
Also how long does it take for them to start loosing thier potency..?
Benzodiacepines can be stored in «normal» conditions. There is no need for frigdes or special containers (unless you live in a ecuatorial or tropical country).
In a environment of 10-25ºC, no extreme humidity and no direct sunlight, they will keep their quality for several years. A noticeable lose of potency will occur 5-10 years after production.