The nurse should first take his blood pressure lying, standing, and sitting. Doxazosin is also used as an antihypertensive agent; the client may be experiencing orthostatic hypotension. Testing the urine for ketones would be appropriate if the client had diabetes mellitus. Because an adverse effect of doxazosin is orthostatic hypotension, the nurse should first take the client's blood pressure; later, she can review other mediations.
