Long-term consumption of Benadryl Hydrochloride Tablets may cause the organism to experience headache, dizziness, cough and other adverse effects. Benadryl hydrochloride tablets are a kind of commonly used antihypertensive drugs in the clinic, which can reduce the vascular resistance, make aldosterone secretion decrease, and then achieve the purpose of controlling blood pressure. Long-term consumption of Benadryl Hydrochloride tablets may have an impact on the body, the common reaction for the body headache, dizziness, coughing, and in serious cases can cause palpitations (rapid heartbeat, often accompanied by panic), fainting, allergies and other serious harm. In addition, it is worth noting that Benadryl Hydrochloride Tablets may have adverse reactions to the organism, and are contraindicated in patients who are allergic to the components of the drug, hyperkalemia, severe renal insufficiency and renal artery stenosis. It is recommended to use the drug under the guidance of a doctor, not blindly self-medication to avoid adverse effects.