A 60 year-old patient HA, who was bedridden for a few days, feels dizzy and experiences significant increase in his heart rate after standing up. If this patient is regularly taking Angiotensin Converting Enzyme (ACE) inhibitor, such as lisinopril, how will this drug affect his sympathetic discharge to the heart, to veins and to arterioles? What changes in his blood pressure can be expected? What advice should be given to this patient?

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