For How Much Time Do Doctors Prescribe Imatinib Tablets 400mg? Doctors advise to take Imatinib Tablets 400mg on daily basis. This medicine should be taken for around 6 to 9 months continuously without missing any dosage for best results. After that, the patient may observe shrinkage in the tumor. This medicine kills the cancer cells and prevents them from growing. Visit - https://www.magicinepharma.com/tablet/imarech-imatinib-mesylate