Expire medicines and chemical reagents why cannot reoccupy?

Does safety use drug [expire medicines and chemical reagents why cannot reoccupy? ] expire the medicines and chemical reagents of invalidation, although some use naked eye observation to be less than apparent change on the exterior, but immanent change and bring harm predict hard. Affect curative effect not only (invalid, reduce effect) , illness of incur loss through delay, and bring various harm, for instance easy cause allergic, exciting, aching, toxic. Monobel is contained take the acute at stable core angina to break out, if invalidation may be brought,serious cardiac muscle stalk dies or accentuation aches; Hypodermic or adrenalin of the inject inside flesh is OK antagonism shock, the phenolic hydroxyl in its structure oxidizes extremely easily, expire apply again after invalidation can send patient heart to stop elephant of wrestle, hypertensive danger, die even.