药品商品从有效期的角度一般可以分为有明确规定有珠）效期的药品和未制定有（失）效期的药品。规定有效期的药品主要为抗生素类、生化类及一些不稳定的化学合成药物，由于其主要有效成分不稳定，容易分解、氧化、变性、失活而导致失效或产生毒副作用。即使在良好的贮藏条件下 Drug products from the perspective of the validity period can generally be divided into have clearly defined beads have the validity of the drug and did not develop (loss) of the drug. Provisions for the validity of the drug mainly antibiotics, biochemical and some unstable chemical synthetic drugs, due to its main active ingredient is unstable, easy to decompose, oxidation, denaturation, inactivation and lead to failure or toxic side effects. Even under good storage conditions