Calcium tablets can not be eaten after the shelf life, the analysis is as follows: 1, calcium tablets after the shelf life of the efficacy of the drug will be significantly reduced, when the calcium tablets after the expiration of the calcium tablets, calcium tablets itself will be obvious changes in the chemical composition, which may result in the loss of calcium ions, or calcium tablets into the gastrointestinal tract is difficult to be digested and absorbed by the body, which reduces the efficacy of the calcium tablets, and therefore after the shelf life of the tablets can not be eaten. 2, calcium tablets After the shelf life of the side effects will increase significantly, because after the calcium tablets into the gastrointestinal tract, in addition to the gastric mucosa, intestinal mucosa has a certain stimulating effect, but also may cause kidney and liver lesions, if the calcium tablets are deposited in the renal skin mucous membranes or glomerular filtration membranes, etc., will cause glomerular filtration rate obstacles, resulting in urinary excretion obstacles, but also on the liver’s function to interfere, so the calcium tablets past the shelf life, it is difficult to be digested and absorbed by the body, thus reducing the effectiveness of the calcium tablets. So calcium tablets can not be eaten after the shelf life.