as a nicotinic acetylcholine receptor antagonist . [ 5 ] [ 6 ] Bupropion belongs to the chemical class of aminoketones and is similar in structure to stimulants cathinone and diethylpropion , and to phenethylamines in general. Medically, bupropion serves as a non-tricyclic antidepressant fundamentally different to most commonly prescribed antidepressants