Friday, October 23, 1998 Published at 07:22 GMT 08:22 UK
Drug ban 'could cut road deaths'
Some prescribed drugs can increase the risk of road accidents, say researchers
Drivers who take some of the most common tranquillisers may be almost 50% more likely to have accidents than those not on drugs, according to research conducted in Scotland.
It advised that people taking one type of the drugs - anxiolytic benzodiazepines, taken for anxiety - and the related drug Zopliclone should be told not to drive.
The researchers, from the Medicines Monitoring Unit at Ninewells Medical School in Dundee, found that taking benzodiazepines, especially in combination with alcohol, increased a driver's chance of having an accident.
One of the researchers, Dr Tom McDonald, said: "The question is what we do about making regulations about whether people should drive while taking these drugs."
The study was prompted by previous European Commission research which showed that psychotropic drugs might play a part in at least 10% of deaths or serious injuries caused by road traffic accidents.
Another study had shown that elderly people who took benzodiazepines ran an increased risk of having accidents.
However, the new research shows people under 45 who take the drugs are more likely to have accidents.
The researchers studied information on more than 400,000 people living in Tayside whose details were held on a pharmaceutical database.
They compared this information with details about people involved in first-time road traffic accidents over a three-year period.
They found that 1,731 Tayside drivers on prescribed drugs had had accidents.
Some 235 had taken benzodiazepines on the day of the accident.
The researchers also looked at other prescribed drugs which are known to have a range of effects, including increased drowsiness and delayed reaction.
They believed this might be because anxiolytic benzodiazepines were more likely to be taken during the day, whereas other types of the drug were taken at night.
Unlike previous studies, the researchers found no link between taking anti-depressants and road accidents.
Walking and cycling
Writing in The Lancet, Desmond O'Neill, of the Centre for Mobility Enhancement at Adelaide and Meath Hospital in Dublin, said the new research did not prove the link between benzodiazepines and driving accidents.
He said doctors should bear the research in mind and advise patients not to drive if they cannot be trusted not to mix benzodiazepines and alcohol.
Doctors should also consider if the condition which the drugs were treating could also be a factor in increased driving accidents.
"Most importantly," he said, "prescribers should query whether the patient really needs a benzodiazepine, and if so, whether it needs to be long acting."
Doctors were warned earlier this year against over-prescribing benzodiazepines and were told that driving while taking tranquillisers could be dangerous.
The Department of Transport said it would consider the new research carefully.
But a spokesman added that drivers could already be banned if they caused an accident due to misuse of drugs, including tranquillisers.