Class: Alpha 1 Antagonist/Quinazoline FDA Indications: Hypertension Off-Label Use: PTSD, Raynaud Phenomenon, Pheochromocytoma, Congestive Heart Failure (in Conjunction With Cardiac Glycosides And Diuretics), Benign Prostatic Hyperplasia, PTSD-Related Nightmares
Forms: 1, 2, 5mg capsule Dose Range: 1-15 mg/day Starting: typically started at 1 mg qhs & is gradually ↑'d to 3-15 mg as tolerated Stopping: Avoid sudden discontinuation, as this can result in rebound hypertension; patients should be cautioned accordingly
- caution when co-prescribed with other medications that can lower blood pressure
- first known selective α1-blocker; discovered in the late 1960s, approved in 1976
blocks α1 in arterioles & veins, lowering peripheral resistance & venous return to the heart
a metaanalysis and multiple clinical trials have shown that prazosin ↓'s nightmares & ↑'s sleep in patients with PTSD
often used adjunctively with SSRIs, though it may be considered as monotherapy
Category C—The limited human pregnancy experience and the animal reproduction data suggest low embryo-fetal risk.
There are no reports describing use during lactation. The manufacturer reports that small amounts are excreted into human milk which is c/w prazosin's molecular weight. The effects on a nursing infant from exposure to the drug from breast milk are unknown.
Elderly patients may be more sensitive to the hypotensive and adverse effects of prazosin.
No dosage adjustment necessary.
No specific recommendations are available for hepatic disease. Since prazosin is extensively metabolized, it is prudent to start with the lowest initial dosage (1 mg PO qhs).
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Last updated August 27 2018 18:45:06. Disclaimer: This website does not provide medical advice, nor is it a substitute for clinical judgment.
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