The onset of action of enalapril maleate tablets is approximately 3.5 to 4.5 hours. After taking enalapril maleate tablets, about 3.5~4.5 hours, its plasma concentration can reach the peak, the half-life of this product is generally 11 hours, the final half-life will probably be extended to 30~35 hours, but the specific time of effect should be analyzed in conjunction with the severity of the patient’s condition as well as the efficacy. However, enalapril maleate tablets is a kind of intermediate-acting antihypertensive drug, which needs to be taken 1~2 times a day, and the dosing program should be adjusted appropriately according to the progress of the disease. If it is not effective for a long time, it is necessary to change other antihypertensive drugs in time, such as nifedipine extended-release tablets. If you are allergic to any components of enalapril maleate tablets need to be prohibited, suffering from bilateral renal artery stenosis should be prohibited, renal insufficiency, impaired renal function is prohibited. It is contraindicated during pregnancy and lactation. Adverse reactions such as dizziness, headache, fatigue may occur while taking this drug. Appearance of the drug’s unresponsive need to consult a doctor in time, if necessary, need to stop using, the specific use of the drug should be under the guidance of a professional physician, do not unauthorized use of drugs.