During the period of validity, drugs will undergo various changes over time under the influence of various physical, chemical and environmental factors. The national pharmaceutical research and production unit considered the above-mentioned effects before the drugs went on the market, and formulated the validity period of each drug according to the parameters of scientific methods (stability inspection and sample observation), that is, the time period to ensure the quality. Once the expiration date has passed, it is difficult to guarantee the quality of drugs.
Extended data:
There are two main reasons why vitamins are afraid of tide. First, once water-soluble vitamins get wet, drugs will dissolve, which will affect the amount of active ingredients. Water-soluble vitamins mainly include vitamin C and vitamin B, and the latter includes B 1, B2, B6, Bl2, folic acid, etc. Second, the ingredients in vitamin supplements are unstable in humid environment, which are easy to decompose and change, and the surface will produce brown spots and even turn yellow.
Therefore, it is necessary to pay attention to moisture-proof when storing vitamins, and vitamin C is more likely to deliquesce, which requires special attention. First of all, don't put vitamins in the kitchen, bathroom or refrigerator, but in a cool and dark place.
Secondly, don't open the bottle cap repeatedly. When you take it, you can pour it on the bottle cap, not on your hand, or you will find that if you pour too much, you will bring the water from your hand into the bottle. Finally, if the vitamin changes color obviously after opening, don't take it even during the shelf life.
People's Network-Why can't expired drugs be used again?
People's Network-Vitamins are afraid of moisture, so keep in mind three points when storing.