What is the impact of the COMT gene on ADHD behavior?

PostedAugust 18, 2025

UpdatedSeptember 3, 2025

ByMy Patient Advice

Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

The COMT gene, short for catechol-O-methyltransferase, affects how the brain processes dopamine, particularly in the prefrontal cortex. In the context of COMT gene ADHD, certain gene variants can disrupt dopamine breakdown, leading to difficulties in executive function, attention regulation, and emotional control. This makes the COMT gene a key player in the behavioural presentation of ADHD.

Because dopamine is essential for cognitive flexibility and decision-making, changes in COMT function often amplify ADHD traits such as impulsivity, poor planning, and rapid mood shifts.

How COMT influences ADHD-related traits

Here’s what research shows about this gene’s impact.

Catechol-O-methyltransferase

This enzyme helps metabolise dopamine, especially in brain regions tied to judgement and inhibition. The “Val” variant of the catechol-O-methyltransferase gene leads to faster dopamine breakdown, which can impair mental clarity and increase distractibility.

ADHD traits

Individuals with certain COMT variants may show more pronounced ADHD traits like disorganisation or emotional reactivity. These effects are often seen in adolescence and adulthood, when demands on self-regulation increase.

Recognising the influence of the COMT gene in ADHD helps tailor interventions that support dopamine balance, whether through medication, cognitive behavioural therapy, or structured routines. Visit providers like ADHD Certify to explore personalised strategies based on your genetic and behavioural profile.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Genetic Factors in ADHD.

Lucia Alvarez, MSc

Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.