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July 17, 2023

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Significant rise in ADHD diagnoses in the UK

by University College London

Both ADHD diagnoses and prescriptions for ADHD medication have increased significantly over the past two decades, except in children under five, finds a new study by UCL researchers.

The research, published in BJPsych Open , reviewed data from 7 million individuals aged three to 99, from IQVIA Medical Research Data, a UK primary care database, between 2000 and 2018.

Of these individuals, 35,877 had an ADHD diagnosis and 18,518 received prescriptions for ADHD medication from their GP.

Although the number of individuals receiving medication for ADHD is still relatively low, the researchers found that ADHD was more commonly diagnosed in children than in adults, and was more common in boys and men than girls and women.

The findings showed that, in absolute terms, the increase was highest in children: among boys aged 10–16 years, 1.4% had an ADHD diagnosis and 0.6% had been prescribed ADHD medication in 2000, rising to 3.5% and 2.4% respectively in 2018.

But the relative increase was largest among adults. For example, over that time, there was approximately a twenty-fold increase in ADHD diagnoses and nearly fifty-fold in ADHD prescriptions in men between the ages of 18–29 (from 0.01% to 0.56%).

However, there was no significant increase in children under five.

Lead author, Dr. Doug McKechnie (UCL Institute of Epidemiology & Health Care), said, "ADHD diagnoses and prescriptions for ADHD medication by a GP have become more common over time.

"While ADHD is most likely to be diagnosed in childhood, an increasing number of people are diagnosed for the first time in adulthood. We do not know exactly why this is happening, but it may be that ADHD has become better recognized and diagnosed.

"Over the last few years, there have been many reports of long waiting lists for ADHD assessments on the NHS, especially in adults. It's likely that more and more people will be diagnosed with, and treated for, ADHD, so specialist services need to be made available to handle this."

Symptoms of ADHD include impulsiveness, disorganization, poor time management skills, difficulty focusing and restlessness. ADHD symptoms start in childhood, but are increasingly recognized to persist in adults.

The number of ADHD diagnoses were about two times higher in the most deprived areas among both children and adults, when compared to the least deprived areas.

Dr. McKechnie said, "Many people are accessing private care for ADHD. This may create health care inequalities given that ADHD is more common in deprived areas. People living in deprived areas may not be able to afford private health care, and may suffer with undiagnosed and untreated symptoms of ADHD for longer. If people in deprived areas are struggling to get diagnosed with ADHD, our results may actually under-estimate how many people there have it, as we only counted diagnosed ADHD."

The research also highlights how ADHD medication is now being more frequently prescribed.

In the NHS, such prescriptions start with a referral from a specialist before being handed over to GPs.

The researchers are calling for GPs to have better support in prescribing and monitoring these medications.

Dr. McKechnie said, "There are already many demands on GPs' time. We need to ensure we have the right frameworks in place to support them as rates and awareness of ADHD increase—allowing patients to receive prompt, safe and effective care."

Dr. Peter Carpenter, Chair of the Royal College of Psychiatrists' Neurodevelopmental Special Interest Group, said, "People with ADHD can struggle with significant disruption to their personal and professional lives if the condition is left untreated. It's good to see public awareness of the disorder has grown and that more people are coming forward for a diagnostic assessment and treatment.

"Once someone has a diagnosis, they usually benefit from adjustments at work or in other areas of their daily lives. Medication can help treat symptoms of inattention, hyperactivity and impulsivity, particularly in those who have a moderate to severe expression of ADHD. Talking therapies and peer support groups can also be beneficial.

"NHS mental health and primary care services must be provided with the necessary resources to meet this unprecedented rise in demand for support. Only with proper funding will they be able to effectively manage growing waiting lists for assessments and provide timely and high-quality post-diagnostic care to those who need it."

Study limitations

The study only captured ADHD medication prescriptions in NHS primary care and not secondary care, which will under-estimate the overall incidence and prevalence of medication usage.

The study period finished in 2018 and since then, various events, including the COVID-19 pandemic, have had a substantial impact upon mental health services. It is therefore likely that the incidence and prevalence of ADHD in the UK has continued to change between the end of the study and the present date.

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