Guidelines for Pharmaceutical Services in Patients with Mental Disorders contains a brief description of mental illness and the role of pharmacists in the management of patients with mental disorders. In addition, it briefly explains drug interactions that can occur and how to overcome them. This guideline is expected to assist pharmacists in the management of pharmaceutical services for patients with mental disorders. In addition, with increased knowledge of pharmacists related to mental illness, cooperation or collaboration with other health workers in improving therapeutic outcomes for patients with mental disorders can be well established.