3'4'-Dihydroxy-2-(methylamino)acetophenone; 4-methylaminoacetopyrocatechol;precursor of epinephrine in some manufacturing processes; a topical adrenergic agent in ophthalmology. ... (05 Mar 2000) ... 
Type: Term Pronunciation: ă-dren′ă-lōn Definitions: 1. Precursor of epinephrine in some manufacturing processes; formerly, a topical adrenergic agent in ophthalmology.