Some people with severe liver and kidney function impairment, small and frail people can take half a tablet of Amlodipine Benadryl Tablets under the supervision of a physician, and use the drug as prescribed by a doctor. Amlodipine Benadryl Tablets is a drug made of Amlodipine (a calcium antagonist) and Benadryl Hydrochloride (an angiotensin inhibitor) for the treatment of high blood pressure, and can be used in patients whose blood pressure cannot be controlled satisfactorily by either Amlodipine or Benadryl alone, or as an alternative to the concomitant use of both drugs. The drug is available in two sizes, Benadryl Hydrochloride: Amlodipine 10mg:5mg or 10mg:2.5mg, and the larger size of half a tablet may be taken under the supervision of a physician in patients with severe renal impairment, small, frail or hepatic impairment. Contraindications include hypersensitivity to amlodipine, Benadryl and other angiotensin-converting enzyme inhibitors, renal failure, and pregnancy. Adverse reactions such as cough, headache, dizziness, and edema may occur after use of the drug. Please use the drug under the supervision of a doctor.