Polysubstance use disorder involves the simultaneous or sequential use of multiple substances, which complicates treatment and heightens the risks of severe health consequences. Individuals with this disorder may use a combination of alcohol, prescription medications, illicit drugs, or stimulants, each impacting the body and brain in different ways. This pattern of substance use can lead to unique challenges in both diagnosis and treatment, as different substances may interact with each other, exacerbating withdrawal symptoms or causing unpredictable effects. Treatment for polysubstance use disorder typically requires a holistic, individualized approach that combines medical detoxification, psychotherapy, and ongoing support. Approaches like cognitive-behavioral therapy (CBT) and contingency management are effective in addressing the multifaceted nature of this disorder, helping individuals reduce cravings and manage the complex layers of dependency.