Dopamine Beta-Hydroxylase Deficiency Watchlist (log in to enable) Retrieved 2021-01-23 Source Orphanet Trials — Genes DBH, ATOX1, CYB561, NPY, TH Drugs Droxidopa ( NORTHERA ), L-threo-3,4-dihydroxyphenylserine, Midodrine hydrochloride ( AMATINE ) Droxidopa ( NORTHERA ), L-threo-3,4-dihydroxyphenylserine, Midodrine hydrochloride ( AMATINE ) ⋯ Interested in hearing about new therapies? Registered! Dopamine beta-hydroxylase deficiency is an extremely rare genetic metabolic disorder characterized by autonomic dysregulation leading mainly to orthostatic hypotension.