Take iron supplements can not drink coffee, strong tea, because coffee has polyphenols, strong tea has tannic acid. Polyphenols and tannic acid and iron can form insoluble salts, which will inhibit the absorption of iron. Avoid taking iron supplements and eggs at the same time, because some proteins in eggs can inhibit the absorption of iron, so it is best to take iron supplements and eat eggs at intervals. When taking iron supplements can not be taken with phosphates, tetracyclines and tannic acid and other drugs, these drugs and iron will combine to produce insoluble substances and prevent the absorption of iron. Iron supplements should not be taken together with cimetidine, desferrioxamine, pancreatic enzymes and pancreatic lipase because these drugs also affect the absorption of iron. In the same way that there are foods and drugs that affect the absorption of iron, iron supplements can also affect the absorption of other drugs. Iron supplements should not be taken together with levodopa, carbidopa, methyldopa and quinolones, because iron supplements can reduce the absorption of the above drugs.