For people with hypertension, taking oral antihypertensive medication in the morning can truly reflect the actual control of hypertension and avoid misjudgment by doctors. Because people with high blood pressure need to take oral antihypertensive drugs to stabilize their blood pressure, they can also see if their blood pressure is well controlled after applying the drugs during a physical examination. Many people may think that drinking a certain amount of water when taking oral antihypertensive drugs will have an effect on the effect of blood draws, but generally most have no special effect. As long as the patient controls the water taken orally to less than 100mL, there is no special effect of drinking water only when taking medication. If the drinking water exceeds 200mL, tests such as blood sugar and kidney function may have a certain impact, and people with high blood pressure are advised to take oral antihypertensive drugs before going for a physical examination.