What are the side effects of taking the combined drugs of amlodipine Besylate 5 MG and Losartan 50 MG. I am a male 68 years old and recently had open heart surgery to replace my aortic valve and aorta I have high blood pressure and since the operation last November I am experiencing Hypo-tension. To where I passed out twice. Once in the Hospital and Once in a parking lot. I am on my 3rd cardiologist who recommended the above. I have changed Meds several times and the side effects of dizziness and lightheadness continue.