The normal value of digoxin blood concentration should preferably be maintained at 0.5-1.0ng/mL, because digoxin is a cardiac drug of the digitalis class, and if the dose is too high, digitalis toxicity may occur. Therefore, generally speaking, patients are advised to take small doses and to observe the actual reaction of patients after taking the drug. Patients are generally advised to take 0.125-0.25 mg orally once a day. If the patient is suffering from renal insufficiency or is a senior patient, it is recommended that 0.125mg can be taken once a day or once every other day. This is because studies have shown that small doses given at intervals can make digitalis drugs work well, and this can also avoid the occurrence of toxic reactions to digitalis drugs.