The effect time after taking blood generating tablets is related to the patient’s condition and cannot be generalized. Generally 30 days is a course of treatment, after a course of treatment, the doctor will adjust the time and dose of medication according to the patient’s condition. The main ingredient of blood circulation tablets is silica sand extract, which has the effect of clearing heat and dispelling wind, relieving dampness and resolving turbidity, activating blood circulation and nourishing blood stasis, tonifying qi and strengthening spleen, promoting blood production, etc. It is commonly used clinically for the treatment of mild to moderate iron deficiency anemia. In the specific course of administration, there is no clinical statistical description of the duration of administration, and the doctor will decide the duration of administration according to the specific condition of the patient. In general, 2 tablets twice daily for mild patients, 2 tablets 3 times daily for moderate and severe patients, and 1 tablet 3 times daily for pediatric patients, to be adjusted according to treatment after 30 days. As a blood tonic, it is normal to have black stools when taking blood tonic tablets and there is no need to be nervous. During the course of taking the medicine, patients should pay attention to review the blood routine to guide the treatment.