Anhedonia seems to be an important factor influencing prognosis of many diseases.  Few studies have shown reduced positive outcome and increased rate of complication in the presence of anhedonia.
Anhedonia cost-effectiveness of therapy
Attention-deficit hyperactivity disorder cost-effectiveness of therapy
Delirium cost-effectiveness of therapy
Hearing impairment cost-effectiveness of therapy
Hirsutism cost-effectiveness of therapy
Alcohol withdrawal cost-effectiveness of therapy
Anhedonia future or investigational therapies
Seizure cost-effectiveness of therapy