Peter Costello, MSN, APRN, PMHNP-BC, Psychiatry in Gurnee, Illinois

Peter Costello, APRN, PMHNP-BC, helps patients build stability, clarity, and confidence through thoughtful psychiatric medication management tailored to each stage of life. Serving children, adolescents, teens, adults, and seniors across Illinois, he partners with individuals and families to reduce symptoms, improve daily functioning, and support long-term mental wellness. His approach blends careful assessment with compassionate collaboration, meeting patients where they are and adjusting treatment as needs evolve. As a prescriber at LifeStance Health, Peter provides medication management for a wide range of mental health conditions, with particular focus on ADHD, anxiety disorders, and depression. He treats children and adolescents as well as teens, adults, and older adults, and integrates evidence-based practices such as Cognitive Behavioral Therapy (CBT) principles, mindfulness strategies, and parenting skills support to strengthen outcomes. He also offers additional expertise across other psychiatric conditions when clinically appropriate. Peter is especially passionate about caring for individuals who are recently discharged from a psychiatric hospital and those involved in court-ordered treatment. He understands the importance of continuity, structure, and trust during high-risk transitions and works closely with patients, families, and care teams to promote safety, adherence, and recovery. His calm, organized approach helps patients navigate complex systems while maintaining dignity and hope. In his work, Peter serves diverse communities, including LGBTQ+ individuals, military members and veterans, and those involved in adoption or foster care. He prioritizes inclusive, respectful care and collaborates with patients to ensure treatment plans align with personal values, family dynamics, and life circumstances. Outside of clinical practice, Peter enjoys reading, spending time with his family, exploring fashion through thrifting, and staying immersed in psychiatry and mental health scholarships.