Combining Doxepin and Prazosin

Medication Classifications and Uses

The American College of Cardiology suggests that doxepin is a tricyclic antidepressant often used in lower doses for insomnia 3
The American Heart Association indicates that prazosin is an alpha-1 blocker primarily used for hypertension and can be considered as a second-line agent for patients with concomitant benign prostatic hyperplasia (BPH) 1, 4
The American College of Cardiology recommends that prazosin is typically dosed 2-20 mg per day in 2 or 3 divided doses 1, 2

The American College of Cardiology notes that both medications may cause orthostatic hypotension, with this effect being more pronounced in older adults 1, 4
The American Academy of Pediatrics states that prazosin is associated with first-dose hypotension, which may be exacerbated when combined with other medications that affect blood pressure 5
The American Academy of Child and Adolescent Psychiatry warns that sedation may occur with both medications, potentially causing additive central nervous system depression 6, 3

The American College of Cardiology advises to monitor blood pressure closely, especially after initiating therapy or changing doses 1, 2
The American Heart Association recommends being vigilant for signs of orthostatic hypotension (dizziness, lightheadedness when standing) 4

The American College of Cardiology cautions against abrupt discontinuation of either medication, as this could lead to rebound effects 1, 3
The American Academy of Child and Adolescent Psychiatry warns against combining with other centrally acting drugs without careful consideration, as this may increase the risk of adverse effects 6, 7
The American College of Cardiology advises being cautious in elderly patients who are more susceptible to orthostatic hypotension and falls 1, 4