Pulaski's chicken soup, commonly referred to as PCS by Dr. Pulaski, was her special recipe for hot chicken soup. It could be used in conjunction with tryptophan-lysine distillate to treat influenza or other mild to moderate respiratory infections.
In 2365, Deanna Troi cited the soup as an example of the level of care Pulaski bestowed upon her patients. (TNG: "The Icarus Factor")