ADHD Medication and Weight Changes in Children: What Parents Should Know About Dexamphetamine and Methylphenidate

New Research Explores How Common ADHD Treatments May Influence Children’s Weight

Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurological conditions affecting children and teenagers. It can impact concentration, school performance, relationships, emotional regulation, and daily activities. For many children diagnosed with ADHD, stimulant medications are an important part of treatment plans designed to improve focus and reduce symptoms.

A recent study has examined two widely used ADHD medications, dexamphetamine and methylphenidate, to understand how they affect children’s symptoms and physical growth. While both treatments were found to improve ADHD symptoms, researchers discovered that children taking dexamphetamine experienced greater weight loss during the first year of treatment compared with children taking methylphenidate.

The findings highlight why healthcare professionals often monitor children’s growth, weight, and overall health when prescribing ADHD medication.

Study Compares Two Popular ADHD Medications

The study included 100 children with ADHD who had not previously used either medication. Researchers randomly assigned participants to receive either dexamphetamine or methylphenidate and followed them for one year.

Both groups showed significant improvements in ADHD symptoms, suggesting that both medications were effective options for managing the condition. Children and families generally continued with their original medication throughout the study period, indicating that both treatments were considered suitable by many participants.

However, the researchers identified an important difference between the two medications. Children who received dexamphetamine experienced more noticeable weight loss compared with those who took methylphenidate.

During the first three months of treatment, children taking dexamphetamine lost an average of about 3 pounds, while those taking methylphenidate lost slightly more than half a pound on average.

The study did not find a meaningful difference between the two medications when it came to changes in height growth. Researchers suggested that the main physical difference observed was related to weight changes rather than overall growth patterns.

Why Weight Monitoring Matters During ADHD Treatment

Stimulant medications can affect appetite in some children. Reduced hunger, changes in eating habits, and increased energy levels may contribute to weight loss during treatment. Because children are still growing and developing, healthcare providers usually monitor weight and height regularly after starting ADHD medication.

Dr. Alison Poulton, a lecturer in pediatrics and child health at the University of Sydney and the study leader, noted that the greater weight loss seen with dexamphetamine is an important factor when selecting treatment and tracking a child’s growth.

This does not mean that one medication is automatically better or worse than another. ADHD treatment decisions depend on many factors, including the child’s symptoms, medical history, response to medication, side effects, and individual health needs.

Parents and caregivers should discuss any concerns about appetite changes, weight loss, or other side effects with their child’s healthcare provider.

Understanding Dexamphetamine and Methylphenidate

Dexamphetamine and methylphenidate are stimulant medications commonly prescribed to manage ADHD symptoms. They work by affecting certain chemicals in the brain involved in attention, focus, and impulse control.

Methylphenidate is one of the most frequently prescribed ADHD medications worldwide. It is available under several brand names and has been used for many years in children and adults with ADHD.

Dexamphetamine is another stimulant medication that can improve attention and reduce hyperactivity and impulsive behaviors. Like other stimulant treatments, it may affect appetite and weight in some children.

Although these medications belong to the same general treatment category, individual children may respond differently. Some may experience noticeable benefits with one medication but fewer benefits or more side effects with another.

ADHD Rates Continue to Rise Among Young People

ADHD affects millions of children and young adults worldwide. According to estimates, approximately 47 million people under age 20 were living with ADHD globally in 2021.

In the United States, around 12% of children and teenagers between ages 3 and 17 have received an ADHD diagnosis. In Australia, the reported rate is lower, with approximately 8% of children diagnosed.

The use of ADHD medications has also increased in recent years. In Australia, the number of children under 18 receiving ADHD medicines in 2023 was nearly two and a half times higher than it was a decade earlier.

The growing number of diagnoses and prescriptions has increased interest in understanding the long-term effects, benefits, and possible side effects of ADHD treatments.

What Parents Should Consider Before Starting ADHD Medication

Choosing an ADHD treatment is a personal decision that should involve parents, children, and qualified healthcare professionals. Medication is only one part of ADHD management, and treatment plans may also include behavioral strategies, educational support, lifestyle adjustments, and therapy.

Before starting medication, parents may want to discuss:

• Possible benefits and expected improvements in ADHD symptoms
• Common and uncommon side effects
• How weight and growth will be monitored
• How often follow-up appointments should occur
• What signs may indicate that treatment needs adjustment

Regular checkups can help doctors determine whether a medication is working effectively while ensuring that a child’s physical development remains on track.

The Importance of Individualized ADHD Care

The results of this study provide useful information for families and healthcare professionals, but they do not suggest that every child will experience the same outcome. Some children may lose weight on stimulant medication, while others may have little or no change.

Every child’s response to ADHD treatment can vary based on genetics, nutrition, activity levels, dosage, and other health factors. Careful monitoring and communication with healthcare providers remain essential.

The goal of ADHD treatment is not only to reduce symptoms but also to support a child’s overall well-being, confidence, learning ability, and healthy development.

Source

University of Sydney news release, July 15, 2026.

Medical Disclaimer

This article is intended for educational and informational purposes only and does not replace professional medical advice, diagnosis, or treatment. Research findings describe general trends and may not apply to every individual child. ADHD medication decisions should always be made with the guidance of a qualified healthcare professional who understands the child’s medical history and specific needs. Parents should not start, stop, or change ADHD medications without consulting a healthcare provider.