Benadryl hydrochloride is an antihypertensive drug, the main effect is to inhibit angiotensin-converting enzyme. Benadryl can inhibit the activity of angiotensin-converting enzyme in the body, and ultimately reduce the generation of angiotensin in the body, the main clinical indications for hypertension, and has a certain protective effect on the kidneys and the heart, for the clinical hypertension accompanied by cardiac insufficiency, renal insufficiency patients, you can choose Benadryl for treatment. Benadryl hydrochloride belongs to the western prescription drugs, the process of taking medication may appear dry cough, edema, nausea, dizziness, muscle pain, blood pressure rise and other adverse reactions, for the drug ingredients allergy, bilateral renal artery stenosis, severe renal insufficiency, lactation and pregnancy women are prohibited. Benadryl should be used under the guidance of a physician to choose the appropriate dose.