Objective: To report, by means of a methodological protocol, the process of deprescribing implemented in a geriatric psychiatry outpatient clinic of a teaching hospital. Methods: The topic of interest was comprehensively reviewed in the scientific literature. Instruments and tools necessary to develop the protocol were selected, including the Treatment Adherence Measure, Beers criteria, the EURO-FORTA List, the Brazilian Consensus on Potentially Inappropriate Medications for Older Persons, Drugs.com, and deprescribing algorithms. Results: The protocol consists of the following steps: 1) Review: Assess older patients’ physical and behavioral status and family context and list all medications used; 2) Analyze: Review patients’ drug therapy; 3) Act: Initiate deprescribing (if indicated); 4) Adjust: Discuss patients’ expectations, beliefs, and preferences and adjust the prescription to their real possibilities; 5) Monitor: Identify responses to treatment, assess adherence to the deprescribing process, and detect return of symptoms or worsening of the underlying disease. Conclusions: Health care professionals need to work together to provide comprehensive care for older persons. The inclusion of deprescribing in more research groups focused on the geriatric population will increase attention to the safety of pharmacological treatment for older patients.