Side effects of Amlodipine Benadryl mainly include cough, headache, dizziness and edema. Amlodipine Benadryl Tablet is a combination of Amlodipine and Benadryl Hydrochloride, which is mainly used in the treatment of high blood pressure, among others. Its common side effects include cough, headache, dizziness, and edema of vasogenic origin. Other rare side effects include insomnia, anxiety, flushing, dry mouth, nausea, constipation, dyspepsia, esophagitis, sexual dysfunction, and allergy. It is also important to note that it should be contraindicated in women who are allergic to Benadryl or other angiotensin-converting enzyme inhibitors or amlodipine, have severe renal dysfunction and are pregnant. The use of specific drugs should be carried out under the guidance of a doctor.