Attention Deficit Hyperactivity Disorder (ADHD) — NZ Condition Guide | KiwiMeds

What is Attention Deficit Hyperactivity Disorder (ADHD)?

ADHD (Attention Deficit Hyperactivity Disorder) is a neurodevelopmental condition characterised by persistent patterns of inattention, hyperactivity, and impulsivity that interfere with functioning. It affects around 5–7% of children and 3–4% of adults in New Zealand. ADHD is increasingly recognised in adults who were not diagnosed as children.

Overview

ADHD presents in three types: predominantly inattentive (difficulty focusing, easily distracted, forgetful), predominantly hyperactive-impulsive (fidgeting, talking excessively, acting without thinking), and combined type. Symptoms in children often include academic difficulties, behavioural issues, and social challenges. In adults, ADHD commonly presents as difficulty organising tasks, time management problems, restlessness, emotional dysregulation, and relationship difficulties. Many adults with ADHD also have anxiety, depression, or learning difficulties.

Treatment in New Zealand

ADHD treatment is multimodal. Stimulant medications (methylphenidate/Ritalin and dexamphetamine) are the most effective medications and are funded by Pharmac with a specialist prescription. Non-stimulant options include atomoxetine and clonidine. Behavioural interventions, parent training, and psychoeducation are important, particularly for children. Coaching, skills training, and CBT help adults. School-based support through Resource Teachers: Learning and Behaviour (RTLB) is available in NZ.

NZ-Specific Information

ADHD diagnosis in NZ requires assessment by a psychiatrist or paediatrician. There are long wait times for public assessment. Stimulant medications are controlled drugs in NZ and require a specialist to initiate prescribing. ADHD NZ (adhdnz.org.nz) provides support and advocacy. LD+ADHD New Zealand supports people with learning differences.

Frequently Asked Questions

Do children outgrow ADHD? Some symptoms improve with age, but many people have ADHD into adulthood. Will ADHD medication change my child’s personality? When correctly dosed, ADHD medication should not change personality — it should help them focus without significant side effects. Is ADHD caused by bad parenting? No — ADHD is a neurodevelopmental condition with strong genetic roots, not caused by parenting style.

Supplements That May Support Management

⚠️ Important: The supplements listed below have varying levels of clinical evidence. They are not a substitute for prescribed medications and should only be considered as adjunctive support under the guidance of a qualified healthcare professional. Always inform your GP or pharmacist before commencing any supplement, as interactions with prescribed medicines are possible.

• Omega-3 Fatty Acids (EPA-dominant) — EPA-dominant omega-3 supplementation has the strongest evidence base among supplements for ADHD, with multiple meta-analyses demonstrating modest but statistically significant improvements in attention, hyperactivity, and impulsivity. Effect sizes are smaller than medication but clinically meaningful as adjuncts, with no side effects.
• Magnesium — Magnesium deficiency is more prevalent in children and adults with ADHD. Supplementation at age-appropriate doses may reduce hyperactivity and improve attention in deficient individuals.
• Zinc — Zinc is a cofactor for dopamine and serotonin synthesis pathways relevant to ADHD. Zinc deficiency is associated with greater ADHD severity, and supplementation may enhance the efficacy of stimulant medications by modulating dopamine transporter function.
• Iron — Iron deficiency (even without anaemia) is associated with worse ADHD symptom severity in some studies, as iron is a cofactor for dopamine synthesis. Ferritin levels should be checked and supplementation considered if low.
• Vitamin D — Vitamin D deficiency is associated with increased ADHD diagnosis rates. Supplementation is appropriate where deficiency is confirmed.

Relevant Vaccinations

Individuals living with ADHD (attention deficit hyperactivity disorder) may benefit from the following vaccinations. Please discuss your vaccination status with your GP or practice nurse, as eligibility and funding through the New Zealand National Immunisation Schedule may apply.

• Influenza (annual) — Children and adults with ADHD who are on stimulant medications may have appetite suppression affecting their nutritional status. Illness exacerbates ADHD symptom management challenges. Annual vaccination is recommended.
• COVID-19 — Maintaining age-appropriate COVID-19 vaccination is recommended for people with ADHD.

Dietary Guidance

Evidence-based dietary modifications play a meaningful role in the management of ADHD (attention deficit hyperactivity disorder). The following foods are generally recommended as part of a balanced, condition-appropriate diet. A referral to a registered dietitian may be beneficial for personalised nutritional planning.

• Protein-rich breakfast — Protein supports dopamine and norepinephrine precursor availability, relevant to ADHD neurotransmitter deficits. A protein-rich breakfast (eggs, Greek yoghurt, nuts) may improve morning attention and reduce the wearing-off effects of stimulant medication.
• Omega-3 rich foods (oily fish, walnuts, flaxseed) — Provides EPA and DHA supporting dopaminergic and serotonergic neurotransmission. Particularly important for children as these fats are essential for neurodevelopment.
• Complex carbohydrates and low-GI foods — Maintain stable blood glucose, reducing the irritability and attention disruption that hypoglycaemia causes — particularly relevant for those on stimulants which suppress appetite.
• Feingold diet (additive elimination) — evidence limited — The elimination of artificial food colours and certain preservatives may reduce hyperactivity in a subset of children with food additive sensitivity. Evidence is mixed but some parents report benefit. A formal elimination trial under dietitian supervision can determine individual response.
• Limit: ultra-processed foods, artificial colours, high-sugar snacks — High sugar intake causes glycaemic variability worsening inattention. Some evidence supports that artificial food dyes (particularly tartrazine/Yellow 5, Sunset Yellow, Red 40) worsen hyperactivity in sensitive children.

Related Conditions & Medications

Related conditions: Anxiety, Depression.