AIDS dementia complex (ADC) is typically seen in the late stages of a person with AIDS. HIV, the virus that causes AIDS, has the ability to affect the brain and the central nervous system in the late stages of the disease. The number of people with ADC has dropped significantly since treatment for AIDS has improved. Symptoms of this disorder are seen along with those of AIDS. They include changes in behavior, mental slowness, depression, and confusion, though these may worsen as a person's AIDS worsens. Symptoms vary widely depending on the individual and how advanced their AIDS is. ADC can be confused with other AIDS-related conditions, so individuals should always consult an experienced doctor about ADC. Currently, the treatment for ADC is antiretroviral therapy, especially zidovudine (AZT). Depression drugs may also improve quality of life for some individuals.