“…and catecholamines (i.e., dopa methyl ester, dopamine, 3,4-dihydroxybenzylamine, and 5-S-cysteinyldopa) in both in vitro and in vivo systems has been reported (4)(5)(6)(7)(8)(9). Side effects have been reported for all these drugs, and include hepatic injury (10), cardiotoxicity (11), hemolysis (12) and photosensitivity (13). These side effects and the cytotoxicity of these drugs in general are thought to be related to the production of damaging free radicals and o-quinones (14)(15)(16)(17)(18)(19)(20).…”