Conversation: The conversation between human and AI assistant.
[|Human|] Every day at some point I am light-headed usually when I stand up. I feel as if I am about to pass out. I just stand there for about 5-10 seconds and the feeling passes. I am on medication (Crestor, Amlodipine, and Lisinopril. I am trying to get in touch with my Physician. He has not called back yet. Any ideas? I am drinking a lot more fluids than usual - water, fruit juices, tea.
[|AI|]  Hello! Thank you for asking on Chat Doctor! I read your question carefully and understand your concern. Your symptoms seem to be caused by orthostatic hypotension, which means that your blood pressure falls during standing up from sitting position. This may be an adverse effect of the antihypertensive therapy you are taking. So some changes in your therapy may be necessary. I recommend consulting with your attending physician and measure your blood pressure in sitting and standing up position. In case of a decrease more than 20 mm Hg of systolic blood pressure during standing up, this would be in favor of the diagnosis of orthostatic hypotension. A head up tilt test is needed to determine this diagnosis. Hope to have been helpful! Greetings!