
I am a psychiatrist trained at the Federal Fluminense University (UFF), a Full Member of the Brazilian Psychiatric Association (ABP), and a member of the International Society for Bipolar Disorders (ISBD). My clinical and academic work is dedicated to the study, diagnosis, and treatment of Mood Disorders, with a special focus on Bipolar Disorder—the area in which I concentrate my main scientific, clinical, and educational interests.
I work at the Center for Research and Education on Bipolar Disorder at the Federal University of Rio de Janeiro (IPUB/UFRJ), CEBIP, and I am a former university professor. I began my Psychiatry training at UFF and deepened my clinical experience at UFRJ, especially in the Treatment-Resistant Depression Outpatient Clinic, caring for patients with severe, chronic, and difficult-to-manage conditions. I completed two postgraduate programs in Bipolar Disorder with Dr. Renato Silva, a leading Brazilian expert in the field, and contributed to his new book scheduled for release in August 2026; I pursued advanced training with Dr. Diego Tavares, a psychiatrist at GRUDA/USP; and completed a fellowship with the coordinator of USP’s Treatment-Resistant Depression, Self-Harm, and Suicidality Outpatient Clinic.
In clinical practice, I provide comprehensive psychiatric care that considers not only emotional symptoms, but also sleep, routine, functioning, performance, eating habits, and quality of life. I also treat binge eating and care for patients seeking healthy weight loss, helping identify emotional, behavioral, and psychiatric factors that may make weight loss and maintaining results more difficult.
I have a particular connection with and experience in caring for students preparing for university entrance exams and competitive public examinations, because I understand firsthand the pressure, anxiety, self-imposed demands, and fear of failure that are common at this stage. I believe mental health care can be decisive in turning potential into results. In recent years, I have treated patients admitted to Medicine at UFRJ, UERJ, and other universities, making this one of the most meaningful areas of my clinical practice.
Beyond clinical care, I am deeply involved in medical education and scientific development. I am a former professor at the Valença School of Medicine, teach physicians, psychologists, and health sciences students, and am a member of CINP (International College of Neuropsychopharmacology), an international organization dedicated to advancing research and education in neuropsychopharmacology. I regularly attend national and international conferences, including the Brazilian Congress of Psychiatry, Brain, the American Psychiatric Association Annual Meeting, and the European Congress of Psychiatry, maintaining a practice grounded in the best scientific evidence. I see patients in Ipanema, Barra da Tijuca, Copacabana, and online, providing specialized, technical, and compassionate psychiatric care.


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I stay continuously up to date by attending national and international conferences. I regularly participate in scientific events in cities such as New York, Los Angeles, San Francisco, and Munich, as well as other relevant international conferences, ensuring a practice aligned with the latest evidence in psychiatry.

Caring for students preparing for university entrance exams and competitive public examinations is one of the areas I most enjoy in my clinical practice. I help patients facing the pressure of highly competitive tests such as Enem, UERJ, Fuvest, and other entrance and public examinations, focusing on anxiety, sleep, concentration, routine, and performance, because I know that caring for mental health can be decisive in turning potential into results.

I have a special interest in the diagnosis and treatment of **insomnia** and other sleep disorders, seeking to offer an approach based on the best scientific evidence. In June 2026, I completed advanced training in **Sleep Medicine** at the **Instituto do Sono**, covering insomnia, sleep neurophysiology, assessment methods in Sleep Medicine, and the relationship between sleep disorders and psychiatric conditions such as bipolar disorder, depression, anxiety, schizophrenia, and substance dependence.

I completed a fellowship in mood disorders under the supervision of the coordinator of the Treatment-Resistant Depression, Self-Harm, and Suicidality Outpatient Clinic at the Institute of Psychiatry of the University of São Paulo Hospital das Clínicas. I complemented my training with two postgraduate programs in bipolar disorder with Dr. Renato Silva, as well as advanced training with Dr. Diego Freitas Tavares, a psychiatrist at GRUDA/IPq-USP and coordinator of the Integrated Bipolar Disorder Outpatient Clinic (AIBIP), consolidating a highly specialized practice in the field. I also completed two postgraduate programs in Mood Disorders.


EXCELENTE Com base em 131 avaliações Publicado em Google L LimaTrustindex verifica se a fonte original da avaliação é Google. Ele é um médico paciente e cuidadoso. Dá espaço para falar, não julga e ajuda a entender o que está acontecendo com ciência e técnica. Ir à consulta com o dr Guilherme faz a gente se sentir mais seguro. Eu amei 🥰Publicado em Google N LimaTrustindex verifica se a fonte original da avaliação é Google. Consulta tranquila com o dr Guilherme, com uma escuta cuidadosa e abordagem clara. O atendimento passou segurança e respeito, o que fez toda a diferença no tratamento! Indico o trabalho dele! 👏👏👏Publicado em Google W TalaricoTrustindex verifica se a fonte original da avaliação é Google. Excelente médico e atendimento perfeitoPublicado em Google D DefizioTrustindex verifica se a fonte original da avaliação é Google. Excelente médico. Me receitou o medicamento adequado, que não me causa efeitos colaterais. Atencioso e gentil.Publicado em Google C FelipeTrustindex verifica se a fonte original da avaliação é Google. Psiquiatra maravilhoso ! Super inteligente e atencioso !Publicado em Google P IvoTrustindex verifica se a fonte original da avaliação é Google. Foi excelente. A secretária muito atenciosa, tambem gostei muito do atendimento Dr. GUILHERME BRETASPublicado em Google G LiraTrustindex verifica se a fonte original da avaliação é Google. Esse lugar é maravilhoso, o Dr Guilherme é um excelente profissional e agradeço a Deus por ter encontrado. E a recepcionista é um amor de pessoa, muito educada e simpática.Certificado: TrustindexO selo verificado do Trustindex é o Símbolo Universal de Confiança. Apenas as melhores empresas podem obter o selo verificado que tem uma pontuação de avaliação acima de 4.5, com base nas avaliações dos clientes nos últimos 12 meses. Leia mais
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