Guardian Unlimited
Login
Go to:  
Guardian UnlimitedSpecial reports
Home UK Business Net Picture gallery The wrap Weblog Talk Search
The Guardian World News guide Arts Special reports Columnists Audio Help Quiz

Medicine and health

  Search this site




  Special report: medical science  



 In this section
The issue explained: beta interferon

Volunteers to test cancer-busting viruses

Cloned pigs boost future of transplants

Extreme fear of birth pain forces women to miscarry

£25m surgical tools plan dropped over BSE risk

Near-death visions baffle doctors

Pioneer surgery separates twins

New tenants of space hotel set for blast-off

Birth control patch goes on sale

Vitamin cartel fined for price fixing

Heart drug fiasco pushes Bayer into red

Watson shifts from generics

Doctors hail new life saving drugs

Medicine's tragic price

Meningitis facts


Children's drug is more potent than cocaine

Jean West
Sunday September 9, 2001
The Observer


The children's drug Ritalin has a more potent effect on the brain than cocaine, a study has found.

Using brain imaging, scientists have found that, in pill form, Ritalin - taken by thousands of British children and four million in the United States - occupies more of the neural transporters responsible for the 'high' experienced by addicts than smoked or injected cocaine. The research may alarm parents whose children have been prescribed Ritalin as a solution to Attention Deficit Hyperactive Disorder.

The study was commissioned to understand more about why Ritalin - which has the same pharmacological profile as cocaine - is effective in calming children and helping them concentrate, while cocaine produces an intense 'high' and is powerfully addictive.

In oral form, Ritalin did not induce this intense psychological 'hit'. But Dr Nora Volkow, psychiatrist and imaging expert at Brookhaven National Laboratory, in Upton, New York, who led the study, said that injected into the veins as a liquid rather than taken as a pill, it produced a rush that 'addicts like very much'. Interviewed in last week's Journal of the American Medical Association newsletter, she said: 'They say it's like cocaine.'

Even in pill form, Ritalin blocked far more of the brain transporters that affect mood change and had a greater potency in the brain than cocaine. Researchers were shocked by this finding. A normal dose administered to children blocked 70 per cent of the dopamine transporters. 'The data clearly show the notion that Ritalin is a weak stimulant is completely incorrect,' said Volkow. Cocaine is known to block around 50 per cent of these transporters, leaving a surfeit of dopamine in the system, which is responsible for the hit addicts crave. But now it is known that Ritalin blocks 20 per cent more of these auto-receptors.

'I've been almost obsessed about trying to understand [Ritalin] with imaging,' said Volkow. 'As a psychiatrist I sometimes feel embarrassed [about the lack of knowledge] because this is by far the drug we prescribe most frequently to children.'

However, it was still not clear why a drug that has been administered for more than 40 years was not producing an army of addicted schoolchildren. Volkow and her team concluded that this was due to the much slower process of oral ingestion. It takes around an hour for Ritalin in pill form to raise dopamine levels in the brain. Smoked or injected, cocaine does this in seconds.

Dr Joanna Fowler, who worked with Volkow on the project, said: 'All drugs that are abused by humans release large quantities of dopamine. But dopamine is also necessary for people to be able to pay attention and filter out other distractions.'

But opponents of Ritalin, labelled a 'wonder drug' and a 'chemical cosh', believe it may be addictive and has dangerous side-effects. Moreover, many believe ADHD is a fraudulent title for a non-existent condition once put down to the exuberance of youth. Professor Steve Baldwin, a child psychologist from Teesside University, who died this year in the Selby rail crash, campaigned against Ritalin. He pointed out similarities between the drug and amphetamines as well as cocaine.

Mandy Smith of Banff in Scotland has a son of eight who was prescribed Ritalin for nine months. 'I am astonished the British Government have allowed this drug to be prescribed,' she said. 'It can destroy people's lives. My son was a changed person when he took Ritalin. He was suicidal and depressed.'

Janice Hill, of the Overload Support Network, a charity for parents of children with behavioural problems, said: 'Now we have thousands of children in Scotland taking a drug that is more potent than cocaine. What does it take before the situation is thoroughly investigated?'

A spokeswoman for Novartis, which makes Ritalin, said: 'Ritalin is available as tablets only. It should only be initially prescribed by a doctor who is a specialist in child behavioural disorders and should always be used and monitored under strict medical supervision.'


Printable version | Send it to a friend | Read it later | See saved stories



UP

Guardian Unlimited © Guardian Newspapers Limited 2001