Dozens of people died while undergoing drug treatment in Buckinghamshire over three years, figures show.
Amid a rise in fatalities nationally, drug reform charity Release warned that drug-related death rates are higher among those not in contact with treatment services.
Figures from the Office for Health Improvement and Disparities show 24 people died while in drug treatment in Buckinghamshire between April 2018 and March 2021.
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However, this was down from 26 who died between April 2017 and March 2020.
Between April 2016 and March 2019, there were 19 deaths in the area.
Across England, 6,940 people died in drug treatment in 2018-21 – up from 6,164, and 5,889 over the previous two three-year periods.
Release, which comprises experts on drug laws, said treatment deaths are concerning but further details around the cause of death are needed.
Dr. Laura Garius, policy lead for the charity, said: "We do not know whether or not these deaths were actually substance-related, how these deaths vary by treatment setting and type of intervention, and we cannot detangle the role that the coronavirus pandemic may have played.
"The absence of further information gives rise to fear and alarmism about the role of treatment in the death of clients, when in reality, we know that drug-related death rates are higher among people not in contact with drug treatment services."
She welcomed an increase in funding for drug treatment by the Government’s new 10-year strategy but added that certain types of treatment – including medical safe-supply for some drugs – were not included.
The figures show 3,726 people across England died while in contact with drug and alcohol services between April 2020 and March 2021 – 27% more than during the year before.
Dr Emily Finch, vice-chair of the addictions faculty at the Royal College of Psychiatrists, said: “Each of these deaths is a tragedy and is a stark reminder of just how destructive and damaging addiction can be.
“It’s vital that anyone struggling with their alcohol or drug use seeks help from local services.
“But years of underfunding and a workforce crisis mean many services are ill-equipped to treat the number of people needing help."
The Department of Health and Social Care said its recently announced drugs strategy will tackle the root causes of substance misuse, including £780 million for treatment and recovery.
It said illegal drugs cost the taxpayer nearly £20 billion every year and that almost half of all burglaries and robberies in England are committed by heroin and crack cocaine addicts.
The latest figures show that of the 314,000 opiate or crack users in England in 2016-17, 1,482 were in Buckinghamshire.
This is equivalent to 4.5 in every 10,000 people in the area, well below the national average, of 8.9 per 10,000.
A DHSC spokesman said: “Drug misuse can have a tragic impact on people’s health, their families and their livelihoods.
“Like other services, drug and alcohol treatment services were affected by the pandemic, but most services have returned to as close to business-as-usual as they can.”