What is the impact of caffeine on mood in individuals with ADHD?

PostedOctober 29, 2025

UpdatedOctober 29, 2025

ByMy Patient Advice

Author: Phoebe Carter, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Caffeine is one of the most commonly used stimulants in the world, but for people with ADHD, its effects on mood and focus can be complicated. Because caffeine increases dopamine and norepinephrine the same brain chemicals targeted by ADHD medications some believe it can help improve attention. However, evidence from NHS and international health sources suggests the impact on mood and emotional regulation is far less predictable.

How caffeine affects ADHD brains

According to a 2023 review in Frontiers in Psychiatry, caffeine can temporarily improve alertness and concentration, but its effects are weaker and shorter-lived than prescribed stimulants such as methylphenidate or lisdexamfetamine. The Royal College of Psychiatrists (RCPsych) notes that people with ADHD often respond strongly to stimulants, meaning caffeine may help focus in some but heighten anxiety or irritability in others.

Mood changes and emotional triggers

Caffeine can influence the same emotional pathways that fluctuate in ADHD. A 2024 PubMed study found that adolescents with ADHD who consumed energy drinks or high-caffeine beverages were more likely to experience restlessness and emotional reactivity. The NHS warns that caffeine can worsen anxiety and disturb sleep both key factors in emotional regulation. According to NICE guideline NG87, sleep disruption is a recognised contributor to emotional dysregulation in ADHD.

Children, adults, and medication safety

The NHS advises against high-caffeine drinks for children and adolescents, particularly for those with behavioural or emotional difficulties. In adults, small doses of caffeine may increase focus, but benefits vary and can quickly tip into irritability or mood swings. The Mayo Clinic cautions that combining caffeine with ADHD medication can heighten side effects like jitteriness, elevated heart rate, and anxiety.

The clinical consensus

There is currently no NHS or NICE endorsement of caffeine as a treatment strategy for ADHD. While mild short-term improvements in alertness may occur, research remains limited and inconsistent particularly regarding emotional outcomes. NICE and NHS guidance both emphasise behavioural strategies, structured routines, and prescribed medication as the safest, most effective ways to support emotional balance and focus.

Takeaway

For people with ADHD, caffeine may feel helpful in the short term, but it often brings more risk than benefit when it comes to mood and emotional stability. According to NHS and NICE guidance, professional, medication-informed care and lifestyle support remain the most reliable path toward better emotional regulation and long-term wellbeing.

Phoebe Carter, MSc

Author

Phoebe Carter is a clinical psychologist with a Master’s in Clinical Psychology and a Bachelor’s in Applied Psychology. She has experience working with both children and adults, conducting psychological assessments, developing individualized treatment plans, and delivering evidence-based therapies. Phoebe specialises in neurodevelopmental conditions such as autism spectrum disorder (ASD), ADHD, and learning disabilities, as well as mood, anxiety, psychotic, and personality disorders. She is skilled in CBT, behaviour modification, ABA, and motivational interviewing, and is dedicated to providing compassionate, evidence-based mental health care to individuals of all ages.

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.