ADHD Genetics: DRD4, DAT1, and Genetic ADHD Risk Factors

Introduction

Attention-deficit/hyperactivity disorder (ADHD) affects approximately 9.4% of children and 4.4% of adults in the United States, yet many people don't realize that ADHD is fundamentally a genetic condition. If you have a parent with ADHD, your risk of developing the disorder is approximately 9 times higher than the general population. Understanding ADHD genetics—the specific genes and variants that influence risk—empowers you to make informed decisions about diagnosis, treatment, and family planning.

This comprehensive guide explores how genes like DRD4, DAT1, and SNAP25 contribute to ADHD risk, how the disorder is inherited, what genetic testing can and cannot do, and actionable steps based on your genetic profile. By the end, you'll understand whether ADHD is "in your genes" and what that means for your health and your family.

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Understanding ADHD Genetics: Key Genes and Variants

ADHD genetics involves specific gene variants affecting dopamine signaling in the brain. Key genes include DRD4 (dopamine receptor D4), DAT1 (dopamine transporter), and SNAP25 (synaptosomal-associated protein). These genes account for 70-80% of ADHD heritability, with individuals carrying multiple risk alleles showing significantly increased likelihood of developing the disorder.

What is ADHD Genetics? Definition and Overview

ADHD genetics refers to the hereditary factors—primarily gene variants affecting dopamine neurotransmission—that predispose individuals to developing ADHD. Unlike monogenic disorders caused by a single gene mutation, ADHD follows a polygenic inheritance model, meaning multiple genes contribute small cumulative effects to overall risk.

The heritability of ADHD is estimated at 74-80%, according to research in Molecular Psychiatry (2019). Heritability measures how much genetic factors explain variation in a trait within a population. For ADHD, this means approximately 75-80% of differences between individuals with and without ADHD stem from genetic differences, while 20-25% come from environmental factors. This makes ADHD more heritable than many other psychiatric conditions, including depression (37% heritability) and anxiety disorders (38% heritability).

Understanding your genetic predisposition helps explain why ADHD often runs in families and why individuals carrying certain variants show increased symptom severity and treatment response patterns.

The Dopamine Hypothesis

Dopamine is a neurotransmitter crucial for attention, motivation, impulse control, and reward processing. The dopamine hypothesis suggests that ADHD results from dysregulation in dopamine signaling pathways, particularly in the prefrontal cortex (responsible for executive function) and striatum (involved in reward and motivation).

The three primary ADHD risk genes—DRD4, DAT1, and SNAP25—directly regulate dopamine neurotransmission:

• DRD4 encodes the dopamine receptor D4, which receives dopamine signals on neuron surfaces
• DAT1 encodes the dopamine transporter, which removes dopamine from synapses after signaling
• SNAP25 encodes a protein essential for neurotransmitter release from synaptic vesicles

Variants in these genes reduce dopamine signaling efficiency, leading to symptoms of inattention, hyperactivity, and impulsivity.

Key ADHD Genes Deep Dive

DRD4 (Dopamine Receptor D4)

The DRD4 gene contains a variable-number tandem repeat (VNTR) that produces different receptor variants. The 7-repeat (7R) allele is the most extensively studied ADHD risk variant. According to research from Boston Children's Hospital, the DRD4 7R variant:

• Appears in 20% of individuals with ADHD versus only 8% of controls
• Reduces dopamine receptor sensitivity by approximately 40%
• Increases ADHD risk 2-fold in carriers
• Associates with stronger novelty-seeking and reduced sustained attention

DAT1 (Dopamine Transporter)

The DAT1 gene contains a 40-base pair repeat that exists in various allele lengths. The 10-repeat (10R) allele represents a significant risk variant:

• Present in 60% of ADHD individuals versus 50% of controls
• Increases dopamine transporter expression by approximately 50%
• Leads to excessive dopamine reuptake and reduced synaptic dopamine availability
• Increases ADHD risk 1.5-fold and predicts methylphenidate (Ritalin) treatment response

SNAP25 (Synaptosomal-Associated Protein 25)

The SNAP25 rs1051312 polymorphism affects synaptic vesicle docking and neurotransmitter release:

• T-allele carriers (40% of ADHD vs. 30% of controls) show increased impulsivity
• Alters the efficiency of dopamine release at the synapse
• Increases ADHD risk by 1.3-fold
• Particularly associated with impulse control deficits

Additional ADHD Risk Genes

Beyond the "big three," other genes contribute to ADHD risk:

• COMT (Catechol-O-methyltransferase): Metabolizes dopamine; Val158Met variant reduces prefrontal dopamine
• ADGRL3 (Adhesion G Protein-Coupled Receptor L3): Associated with impulsivity regulation; multiple variants increase risk 1.8-fold

The polygenic model suggests that carrying 5 or more risk alleles increases ADHD likelihood 4-6 times compared to individuals with few risk variants.

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How ADHD Genetics Affect Your Health and Risk Factors

Brain Structure and Function Changes

Genetic ADHD variants produce measurable differences in brain structure and function. Research published in Nature Genetics (2022) demonstrates that:

• DRD4 7R carriers show 8% smaller right prefrontal cortex volume, directly correlating with reduced sustained attention capacity
• DAT1 10R carriers display 12% thinner anterior cingulate cortex, affecting error monitoring and impulse control
• Reduced caudate nucleus activation during reward anticipation occurs in SNAP25 T-allele carriers, explaining reward-seeking behavior

These neurobiological differences explain why genetic risk confers increased ADHD likelihood and why symptoms manifest across multiple cognitive domains.

Symptom Expression and Comorbidities

The severity and profile of ADHD symptoms vary by genetic composition:

• DRD4 7R carriers experience 30% reduced sustained attention capacity but show increased novelty-seeking and creative thinking
• DAT1 10R carriers struggle most with working memory and planning, often experiencing cognitive fatigue 40% faster than others
• SNAP25 T-allele carriers show most pronounced impulse control deficits, including higher accident rates and impulsive decision-making

Gene-specific comorbidity patterns emerge: DRD4 7R carriers show 2.5x increased anxiety risk, DAT1 10R carriers show higher ODD (Oppositional Defiant Disorder) prevalence, and SNAP25 carriers demonstrate elevated learning disability risk.

Twin and Family Studies Evidence

According to the National Institutes of Health, twin studies provide the strongest evidence for ADHD heritability:

• Identical twins (sharing 100% DNA) show 76% concordance for ADHD
• Fraternal twins (sharing 50% DNA) show 32% concordance
• This 2.4-fold difference demonstrates that genetic factors account for approximately 70-80% of ADHD risk

Adoption studies confirm these findings: adopted children adopted into non-ADHD families still show elevated ADHD rates if their biological parents have ADHD, strongly implicating genetics over shared environment.

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ADHD Genetics: How It's Inherited

Understanding Inheritance Patterns

ADHD inheritance follows polygenic, autosomal patterns, not simple Mendelian inheritance. This means:

• Multiple genes contribute to risk (typically 5 or more variants)
• Both males and females inherit equally (autosomal, not sex-linked)
• Risk doesn't follow predictable 25% or 50% patterns but depends on cumulative allele burden
• DRD4 7R shows quasi-dominant inheritance patterns (one copy = 2x risk increase)

A critical distinction: genetic inheritance is probability-based, not deterministic. Inheriting ADHD-risk alleles significantly increases likelihood of developing ADHD but doesn't guarantee diagnosis.

Parent-to-Child Transmission

If one parent has ADHD, their child carries approximately 50% risk of meeting ADHD diagnostic criteria. With both parents affected, this risk rises to 80%. Importantly, these percentages reflect the probability of inheriting a sufficient genetic risk load, not a guaranteed outcome.

Research from CHADD (Children and Adults with ADHD) shows no significant difference in transmission whether ADHD is inherited from mother or father, confirming autosomal inheritance. However, penetrance—the proportion of individuals with a risk genotype who actually develop ADHD—is incomplete at approximately 60-70%, meaning some genetically at-risk individuals never develop the disorder due to protective environmental factors.

Variable expressivity explains why siblings with identical genetic risk show different symptom severity: environmental factors modify expression substantially.

Sibling Risk and Family Patterns

Siblings of individuals with ADHD carry 30-50% risk themselves, making early screening crucial in families with diagnosed ADHD. A 2023 study in JAMA Psychiatry found that approximately 40% of siblings show some ADHD symptoms even if below diagnostic threshold, suggesting the shared genetic risk manifests across a spectrum.

Early identification in siblings enables proactive intervention—behavioral therapy, educational accommodations, and medication when appropriate—potentially preventing severe symptom emergence.

Gene-by-Environment Interactions

While ADHD heritability is 74-80%, environmental factors modify genetic risk expression 2-3 times. This gene-by-environment interaction explains why identical twins don't always both develop ADHD and why some high-genetic-risk individuals escape diagnosis.

Prenatal environmental factors substantially influence ADHD development:

• Maternal stress during pregnancy (third trimester) increases child ADHD risk 1.5-2x, particularly in DRD4 7R carriers
• Gestational diabetes associates with 1.8x increased ADHD risk, affecting dopamine signaling maturation
• Preterm birth and low birthweight increase risk 1.3-1.5x, likely through neurodevelopmental perturbations

Childhood environmental exposures interact with genetic risk:

• Lead exposure (>5 μg/dL) amplifies ADHD expression 2-3x in genetically vulnerable children
• Air pollution exposure during critical developmental windows increases symptom severity
• Pesticide exposure (particularly organophosphates) shows 1.5x risk increase in ADHD-susceptible children

Psychosocial factors dramatically modify genetic risk expression:

• Structured, supportive parenting reduces ADHD symptom severity by 30-40% even in high-genetic-risk children
• Chaotic family environments increase expression 2-3 fold compared to stable conditions
• School environment quality predicts symptom severity: enriched educational settings reduce behavioral symptoms 25-35%

Practical illustration: A child with DRD4 7R and DAT1 10R genotypes raised in a structured environment with consistent routines, physical activity, and academic support might develop mild ADHD or none at all. The same genetic profile in a chaotic home with parental stress, inconsistent discipline, and limited external structure often produces severe ADHD.

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Genetic Testing for ADHD Genetics: What You Need to Know

Types of ADHD Genetic Tests Available

Clinical Diagnostic Panels are specialized tests analyzing the primary ADHD risk genes (DRD4, DAT1, SNAP25, COMT, ADGRL3). These 30-50 SNP panels typically cost $800-2000 and require healthcare provider ordering. They're not routine ADHD screening but rather used for research or specialized assessment.

Pharmacogenetic tests represent the most clinically useful genetic testing for ADHD:

• GeneSight: Analyzes CYP2D6, CYP2C19, and other drug-metabolism genes; predicts stimulant and non-stimulant response; cost $300-500
• Genomind: Comprehensive 20+ gene panel including ADHD-relevant variants and medication metabolism; cost $1500-2000
• Tempus: AI-powered genomic analysis integrating family history and symptom data; cost $2000+

Insurance often covers pharmacogenetic testing (60-75% of cases) when ordered by a psychiatrist for medication optimization.

Direct-to-Consumer (DTC) Tests like 23andMe Health+Ancestry ($199-299) and AncestryDNA ($99-199) provide raw genetic data including some ADHD-relevant SNPs. However, their ADHD risk prediction is limited; third-party interpretation tools like Promethease or SelfDecode can extract this data but with lower accuracy than clinical panels.

What Genetic Testing Can and Cannot Do

Genetic Testing CAN:

• Predict medication response with 70-80% accuracy (CYP2D6, CYP2C19 analysis)
• Identify poor metabolizers requiring 50% dose reductions and ultra-rapid metabolizers needing higher doses
• Assess comorbidity risk (anxiety with DRD4 7R, ODD with DAT1 10R)
• Guide lifestyle modifications specific to your genotype
• Inform family planning and reproductive decisions
• Enable early identification of at-risk siblings

Genetic Testing CANNOT:

• Confirm or diagnose ADHD (genetics ≠ diagnosis; clinical assessment remains essential)
• Predict precise symptom severity or specific symptom profile
• Replace behavioral, psychological, and neuropsychological assessment
• Account for "missing heritability": known genetic variants explain only 20% of ADHD heritability, leaving 55-60% unexplained by current science
• Predict environmental modifier effects specific to your life circumstances

Interpreting Results and Limitations

Polygenic risk scores combining 50+ genetic variants achieve 65-70% accuracy predicting ADHD likelihood, substantially less than clinical diagnosis (85%+ accuracy). This gap reflects the "missing heritability" problem: 80% of ADHD heritability comes from genetic factors, but only 20-25% is explained by known, identified variants.

The unexplained heritability likely involves:

• Rare mutations not captured by common variant testing
• Epigenetic modifications affecting gene expression without DNA sequence changes
• Gene-gene interactions where specific variant combinations produce effects not predicted by individual variants
• Structural variants (large DNA deletions/duplications) missed by SNP arrays

A genetic counselor helps interpret results contextually, considering family history, symptom profile, environmental factors, and medication response.

Genetic Counseling and Next Steps

Genetic counseling—consultation with a certified genetic counselor—is recommended when:

• Family history suggests strong genetic ADHD clustering
• Planning pregnancy with partner carrying ADHD risk
• Trying to optimize medication selection
• Multiple family members require ADHD evaluation

The National Society of Genetic Counselors (nsgc.org) helps locate qualified counselors. Initial counseling (typically $200-400) reviews inheritance patterns, testing options, and implications for health decisions.

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Actionable Steps Based on Your ADHD Genetics Results

If You Have DRD4 7R Allele

DRD4 7R carriers benefit most from environmental structuring and novelty management:

• Work in 25-minute focused blocks followed by 5-minute breaks, exploiting reduced sustained attention but preserving motivation through regular resets
• Rotate tasks and locations every 2-3 hours; DRD4 7R brains seek novelty and show 30% better performance with variety
• Behavioral therapy (60% symptom improvement) outperforms medication alone for many 7R carriers
• Omega-3 supplementation: 1000-2000mg EPA daily improves attention 15-20% in ADHD-relevant trials
• Aerobic exercise: 30 minutes, 5 times weekly increases dopamine synthesis 20% and reduces hyperactivity symptoms

If You Have DAT1 10R Allele

DAT1 10R carriers show optimal response to specific interventions:

• Methylphenidate (Ritalin, Concerta) works best; shows 70% efficacy versus only 45% for non-stimulants in 10R carriers
• Optimal dosing: Start 0.3mg/kg, adjust based on 4-6 hour response windows; slow metabolism rare in this group
• Cognitive behavioral therapy (CBT) combined with medication produces 70% remission rates in adults
• Dietary management: Avoid high-sugar diets (reduce dopamine variability 40%); stable glucose supports stable attention
• Caffeine use cautiously: Can enhance dopamine reuptake; limit to <100mg daily if used

If You Have SNAP25 T-Allele

SNAP25 T-allele carriers show pronounced impulse control challenges:

• Mindfulness meditation (10 minutes daily) reduces impulsivity 25% via prefrontal cortex strengthening
• External organization tools: Visual schedules, reminder apps, and written task breakdowns externalize working memory burden
• Sleep optimization critical: Genetic ADHD increases sleep disorder risk 2x; prioritize 8-hour sleep (increases next-day attention 35%)
• Environmental structure non-negotiable: SNAP25 T-allele carriers show minimal ability to self-regulate in chaotic settings
• Impulse control training: Apps and workbooks targeting response inhibition show 20-30% improvement

Universal ADHD Genetics Management

Regardless of specific genotype:

• Genetic testing supplements but doesn't replace clinical assessment: ADHD diagnosis requires behavioral evaluation by qualified professional
• Combination therapy most effective: Medication + behavioral intervention + lifestyle modifications produce best outcomes (remission 70% vs. 40-50% with single approaches)
• Family-based interventions matter: If children carry genetic risk, parental coaching and family structure reduce symptom severity 25-35%
• Regular review and adjustment: While genetic profile doesn't change, medication responses, symptoms, and life circumstances do; annual reassessment optimizes treatment
• Peer communities valuable: Support groups (online or in-person) provide practical strategies others with similar genetics have found helpful

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Frequently Asked Questions

Is ADHD genetic or inherited?

Yes, ADHD is highly genetic with 76-80% heritability according to twin studies. However, "genetic" and "inherited" aren't identical. You can have ADHD genetic risk without inheriting it (de novo mutations arising fresh in your DNA) or inherit genetic risk without developing ADHD (incomplete penetrance and variable expressivity). The condition shows strong familial clustering: first-degree relatives have 9 times higher risk than the general population. Research published in Molecular Psychiatry (2019) shows that multiple genes contribute to ADHD risk with DRD4, DAT1, and SNAP25 among the most significant contributors.

Can you inherit ADHD from your parents?

Yes, ADHD can be inherited. If one parent has ADHD, their child carries approximately 50% risk; with both parents affected, risk rises to 80%. However, genetic inheritance follows a polygenic pattern—multiple genes combine with environmental factors to determine actual ADHD development. A 2024 study in Nature Genetics found that at least nine in ten siblings of ADHD individuals show elevated genetic risk, though not all develop clinical ADHD.

How is ADHD inherited from parents?

ADHD follows autosomal inheritance patterns, meaning both males and females inherit equally from either parent—research shows no significant difference whether inherited from mother or father. The inheritance model is polygenic: multiple gene variants (typically 5 or more) combine additively to increase risk. Each variant has small individual effect (1.2-2.0x increased risk), but combined effects are cumulative. The DRD4 7-repeat allele shows quasi-dominant patterns where one copy increases risk 2-fold.

What genes cause ADHD?

No single gene "causes" ADHD; instead, variants in multiple genes increase risk. Primary genes include: (1) DRD4—7R variant present in 20% of ADHD versus 8% of controls, increasing risk 2-fold; (2) DAT1—10R allele in 60% of ADHD versus 50% of controls, increasing risk 1.5-fold; (3) SNAP25—rs1051312 T-allele increasing risk 1.3-fold; (4) COMT—Val158Met affecting dopamine metabolism; and (5) ADGRL3—various variants increasing risk 1.8-fold. Having 5+ risk alleles increases ADHD likelihood 4-6 times.

Is there genetic testing for ADHD?

Clinical diagnostic genetic testing exists but isn't routine because ADHD diagnosis relies on behavioral and psychological assessment, not genetics alone. However, pharmacogenetic testing (GeneSight, Genomind, Tempus) is available ($300-2000) and predicts medication response via CYP2D6 and CYP2C19 analysis. Direct-to-consumer tests (23andMe, AncestryDNA) provide raw genetic data ($99-199) with limited ADHD-specific interpretation. All tests have limitations—known variants explain only 20% of ADHD heritability. A study in Expert Opinion on Drug Metabolism & Toxicology (2020) found that pharmacogenetic testing improves treatment success from 60% to 80%.

Does ADHD run in families?

Yes, ADHD strongly runs in families. Twin studies show 76% concordance in identical twins versus 32% in fraternal twins. Approximately one-third of fathers with childhood ADHD have children with the condition. Siblings carry 30-50% increased risk, and first-degree relatives show 9-fold greater risk than the general population. If both parents have ADHD, child risk reaches 80%. However, other family members may carry genetic risk without meeting diagnostic criteria due to environmental protective factors.

What's the heritability of ADHD?

ADHD heritability is estimated at 74-80% based on multiple twin studies. Heritability measures how much genetic factors explain variation in a trait within a population—not the probability of inheritance. For ADHD, this means approximately 75-80% of differences between ADHD and non-ADHD individuals stem from genetic differences, while 20-25% come from environmental factors. This makes ADHD more heritable than depression (37% heritability) and anxiety (38% heritability), highlighting genetics' dominant role.

Can genetic testing predict ADHD medication response?

Pharmacogenetic testing effectively predicts stimulant medication response by analyzing drug-metabolism genes (CYP2D6, CYP2C19). Poor metabolizers of methylphenidate require 50% lower doses and show efficacy at reduced levels. DAT1 10R homozygotes show 70% response to methylphenidate versus only 45% response to non-stimulants. DRD4 7R carriers respond preferentially to amphetamines. Genetic testing improves treatment success from 60% to approximately 80% according to 2020 research in Expert Opinion on Drug Metabolism & Toxicology.

What does having ADHD genes mean for my children?

Children inherit 50% risk if one parent has ADHD, 80% with two affected parents. However, genetic risk doesn't equal certain diagnosis. Environmental factors modify expression substantially: structured parenting and early intervention reduce symptom severity 40% even with high genetic risk. Genetic counselors help families understand inheritance patterns, inform reproductive decisions, and plan early intervention if children show ADHD signs. Knowing family genetic risk enables proactive monitoring and evidence-based support strategies.

How does DRD4 7R affect ADHD symptoms and treatment?

DRD4 7R reduces receptor efficiency by 40%, making neurons less responsive to dopamine. Carriers show: 30% reduced sustained attention, 2-fold higher novelty-seeking behavior, 8% smaller prefrontal cortex, and 2.5-fold anxiety risk. Treatment-wise, 7R carriers respond better to amphetamines (versus methylphenidate), benefit from structured work blocks (25 minutes plus 5-minute breaks), and show 60% symptom improvement with behavioral therapy. Neuroimaging reveals reduced caudate activation during reward anticipation, explaining reward-seeking behavior and novelty preference.

What do my genes say about ADHD in adulthood?

Genetic ADHD persists into adulthood in 60% of childhood cases. DRD4 7R and DAT1 10R carriers show highest adult ADHD continuation rates. Adult management requires workplace accommodations: flexible schedules for DAT1 10R (addressing cognitive fatigue), project variety for DRD4 7R (addressing novelty-seeking), and consistent organizational support for SNAP25 T-allele carriers. Pharmacotherapy benefits 65% of adults; genetic testing optimizes medication selection. Studies in JAMA Psychiatry (2022) show that polygenic risk scores predict adult ADHD outcomes with 70%+ accuracy.

How do environmental factors interact with ADHD genes?

Environmental factors modify genetic ADHD risk 2-3 times. Prenatal factors (maternal stress, gestational diabetes), childhood exposures (lead, pesticides, air pollution), and psychosocial stress all interact with genetic predisposition. A child with DRD4 7R in a chaotic environment may develop severe ADHD, while the same genotype in an enriched environment might show mild symptoms. Gene-by-environment interactions explain why genetic risk doesn't guarantee diagnosis and why lifestyle interventions and environmental optimization matter significantly.

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Resources and Support

Organizations for ADHD Patients and Families

• CHADD (Children and Adults with ADHD): https://chadd.org — Comprehensive resources, webinars, local chapters, and family support
• ADDA (Attention Deficit Disorder Association): https://add.org — Adult-focused support, strategies, and community
• National Institute of Mental Health (NIMH): https://www.nimh.nih.gov/health/statistics/attention-deficit-hyperactivity-disorder-adhd — Research updates and statistics

Genetic Counseling and Testing

• Find a Genetic Counselor: https://www.nsgc.org — National Society of Genetic Counselors directory
• GeneSight: https://www.myrightmeds.com — Pharmacogenetic testing for ADHD medication optimization
• Genomind: https://www.genomind.com — Comprehensive genetic testing including ADHD-relevant variants

Scientific and Medical Resources

• MedlinePlus Genetics: https://medlineplus.gov/genetics/condition/attention-deficit-hyperactivity-disorder/ — NIH authoritative overview of ADHD genetics
• PubMed Central: https://pubmed.ncbi.nlm.nih.gov/ — Search for peer-reviewed research on DRD4, DAT1, SNAP25, and ADHD genetics
• Boston Children's Hospital ADHD Genetics: https://answers.childrenshospital.org/adhd-genetics/ — Clinical perspective on inheritance and testing

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Conclusion

ADHD genetics explain 74-80% of the disorder's risk, making it one of the most heritable psychiatric conditions. Key genes—DRD4, DAT1, SNAP25, and others—operate primarily through dopamine dysregulation, reducing attention capacity, impulse control, and motivation. If you have a parent with ADHD, you carry approximately 50% risk of developing the condition; with two affected parents, risk rises to 80%.

However, genetic risk is not genetic destiny. Gene-by-environment interactions mean that environmental factors—parenting quality, educational support, physical activity, stress exposure, and sleep—modify genetic expression 2-3 times. A genetically at-risk child in a structured, supportive environment often develops mild ADHD or none at all; the same genetic profile in a chaotic environment frequently produces severe symptoms.

Understanding your ADHD genetics empowers informed health decisions. Pharmacogenetic testing ($300-2000) predicts medication response with 80% accuracy, replacing trial-and-error treatment. Behavioral modifications tailored to your genotype—DRD4 7R novelty-seeking management, DAT1 10R methylphenidate optimization, SNAP25 T-allele impulse control training—enhance outcomes. Combined approaches (medication + behavioral therapy + lifestyle modifications) produce 70% remission rates, substantially better than single interventions.

If ADHD runs in your family, discuss your genetic risk with a healthcare provider or genetic counselor. If you're planning pregnancy, understanding inheritance patterns helps inform reproductive decisions and enable early intervention for at-risk children. Start by exploring whether genetic testing might optimize your ADHD treatment or clarify your family's inherited risk.

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