Eraser is the trade name of imported Gefitinib, which is usually 10 tablets/box, 0.25g/tablet, and the price is around$540, and there is also a domestic Gefitinib, which is also 10 tablets/box, and the price is around$490. This gefitinib is a kind of anticancer drug, which is mainly used for the treatment of non-small cell lung cancer, usually 1 tablet/dose, 1 time/dose. Gefitinib has a certain effect on liver function, may cause liver enzyme elevation or hepatitis, so, during the use of the drug must be regularly monitored liver function, if the occurrence of missed dose, after can think of as soon as possible, but if the time from the next dose is less than 12 hours, it is recommended not to make up the drug. For patients who have difficulty swallowing, or who need to be given the medication by nasal cannula, the entire tablet can be placed directly into half a cup of drinking water and allowed to stir and disperse before being taken immediately, or after the medication has been given through the nasal cannula, it is important to rinse out the remaining medication with water.