The comprehensive pharmacologic therapy for treatment of obesity including Cysteine is a procedure which involves the administration of a desired therapeutic range of Diethylpropion and/or Phentermine in combination with a SSRI medication and nutritional supplementation for brief and long durations which may be 12 months or more. The preferred procedure involves the administration of drugs in combination which are identified as: Citalopram (Celexa) and Phentermine; Citalopram (Celexa) and Diethylpropion; Citalopram (Celexa), Phentermine, and Diethylpropion. In addition nutritional supplementation such as a multivitamin, 5-Hydroxytryptophan, Cysteine, vitamin B6, vitamin C, Tyrosine, Calcium, and Lysine may be used to enhance the performance of the weight loss treatment program.