A study reported by the BBC highlights a worrying medical phenomenon: certain treatments prescribed for neurological diseases such as Parkinson’s disease may cause serious addictive behaviours, including compulsive gambling.
Patients transformed without understanding why
According to a BBC investigation based on numerous patient testimonials, hundreds of users of drugs called dopamine agonists, prescribed for neurological diseases such as Parkinson’s disease and restless legs syndrome, claim to have developed compulsive behaviours after starting treatment. These behaviours include excessive gambling, uncontrolled shopping and impulsive sexual behaviour. Before taking the medication, there was no indication that such behaviour would develop. There was no history of addiction or any particular attraction to gambling. Then, suddenly, they lost control.
To understand this phenomenon, we need to look at how the human brain works. Dopamine agonists act directly on dopamine. Dopamine is at the heart of the brain’s reward system. It comes into play when we feel pleasure or anticipate a reward. Gambling stimulates precisely this circuit: excitement, hope of winning, immediate gratification.
Specialists have recognised for several years that these drugs can cause what are known as impulse control disorders. In some patients, the ability to resist temptation is greatly reduced. Gambling then becomes particularly dangerous. It combines risk, emotional stimulation and quick rewards — a powerful neurological cocktail for a brain whose inhibitory mechanisms are weakened.
Several testimonies collected in the investigation indicate that many patients had not been clearly informed of the behavioural risks associated with their treatment. Some explain that it took them months to make the connection between their disastrous financial decisions and their medication. In the meantime, the consequences were already severe: significant debts, loss of savings and family tensions.
A revealing court case
One of the most striking cases concerns a British patient suffering from restless legs syndrome. After taking ropinirole — a dopamine agonist — he developed a severe addiction to online gambling. In a short period of time, he lost all of his savings, as well as those of his wife. According to his testimony, his doctor did not give him any clear warning about this risk, even though the information was included in the medication leaflet.
The case ended up in court. He was awarded approximately £77,000 in compensation. However, the doctor did not admit any wrongdoing.
Experts now insist on the need for closer monitoring of patients taking dopamine agonists. Family members also play a crucial role, as behavioural changes are often visible to others before they are recognised by the patient themselves. Early monitoring could enable treatment to be adjusted quickly or limit the financial and psychological consequences.
The BBC investigation reminds us that the side effects of medication are not always physical: they can affect an individual’s very identity. In light of these revelations, one thing is essential: better information, better monitoring and recognition that behind certain behaviours deemed irrational there is sometimes an unknown medical cause.