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New Drugs to Treat ADHD: Opportunities and Challenges in Research and Development

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New Discoveries in the Behavioral Neuroscience of Attention-Deficit Hyperactivity Disorder

Part of the book series: Current Topics in Behavioral Neurosciences ((CTBN,volume 57))

Abstract

Since the landmark MTA (Multimodal Treatment of ADHD) trial unequivocally demonstrated the efficacy of methylphenidate, catecholaminergic drugs, especially stimulants, have been the therapeutic mainstay in treatment of Attention-Deficit Hyperactivity Disorder (ADHD). We review the new drugs which have entered the ADHD formulary. The lessons learned from drug-candidates that have succeeded in clinical trials together with those that have not have also been considered. What emerges confirms and consolidates the hypothesis that clinically effective ADHD drugs indirectly or directly increase catecholaminergic neurotransmission in the prefrontal cortex (PFC). Attempts to enhance catecholaminergic signalling through modulatory neurotransmitter systems or cognitive-enhancing drugs have all failed. New drugs approved for ADHD are catecholaminergic reuptake inhibitors and releasing agents, or selective noradrenaline reuptake inhibitors. Triple reuptake inhibitors with preferential effects on dopamine have not been successful. The substantial number of failures probably accounts for a continued focus on developing novel catecholaminergic and noradrenergic drugs, and a dearth of drug-candidates with novel mechanisms entering clinical development. However, substantial improvements in ADHD pharmacotherapy have been achieved by the almost exclusive use of once-daily medications and prodrugs, e.g. lisdexamfetamine and Azstarys®, which improve compliance, deliver greater efficacy and reduce risks for diversion and abuse.

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Abbreviations

ADHD:

Attention-deficit hyperactivity disorder

ADHD RS :

ADHD Research Scale

AE:

Adverse event

AISRS:

Adult ADHD Investigator Symptom Rating Scale

BED:

Binge-eating disorder

BIS-11:

Barratt Impulsiveness Scale, Version 11

BRIEF:

Behaviour Rating Inventory of Executive Function

C-II; CIV:

Schedule 2; Schedule 4 controlled drug

CGI-S:

Clinical Global Impressions Scale

CNS:

Central nervous system

DA:

Dopamine

DAT:

Dopamine reuptake transporter

DBRCT:

Double-blind, randomized clinical trials

EDE-Q7:

Eating Disorder Examination Questionnaire Brief Version

ER:

Extended release

FDA:

Food and Drug Administration

IR:

Immediate release

LDX:

Lisdexamfetamine

MTA:

Multimodal treatment of ADHD

NA:

Noradrenaline (norepinephrine)

NET:

Norepinephrine reuptake transporter

NICE:

National Institute for Health and Care Excellence

NSDUH:

National Survey on Drug Use and Health

PERMP :

Permanent Product Measure of Performance

PFC/FC:

Prefrontal cortex/Frontal cortex

SDX:

Serdexmethylphenidate

SERT:

Serotonin reuptake transporter

SKAMP:

Swanson, Kotkin, Agler, M-Flynn and Pelham scale

YBOCS-BE:

Yale-Brown Obsessive Compulsive Scale adapted for Binge Eating

XR:

Extended release

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Correspondence to David J. Heal .

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D.J. Heal, J. Gosden and S. Smith are shareholders and employees of DevelRx Ltd. DevelRx provides consultancy to a wide range of pharmaceutical companies conducting R&D in ADHD. The authors received no financial support for writing this review and no commercial organization had any input on its content.

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Heal, D.J., Gosden, J., Smith, S.L. (2022). New Drugs to Treat ADHD: Opportunities and Challenges in Research and Development. In: Stanford, S.C., Sciberras, E. (eds) New Discoveries in the Behavioral Neuroscience of Attention-Deficit Hyperactivity Disorder. Current Topics in Behavioral Neurosciences, vol 57. Springer, Cham. https://doi.org/10.1007/7854_2022_332

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