Dopamine drugs linked to compulsive gambling harm

Hundreds of patients have reported that prescription medication designed to treat movement disorders triggered gambling addictions. For some, this led to debts of tens of thousands of pounds.

These drugs belong to a class known as dopamine agonists. They mimic dopamine by stimulating dopamine receptors.

Dopamine agonists are commonly prescribed for conditions like Parkinson’s and Restless Legs Syndrome because they are clinically effective for motor symptoms. Examples include Ropinirole, Cabergoline, Bromocriptine and Pramipexole.

However, the nature of the medication means they use same chemical pathway heavily involved in reward, motivation and risk-taking behaviour.

For some patients, that stimulation appears to have had unintended consequences.

Compulsive Gambling

One woman told the BBC she lost at least £30,000. She had no prior history of problem gambling but developed a compulsive gambling habit while taking medication.

Others described similar patterns:

• Escalating online betting.
• Secrecy.
• Mounting financial losses.
• A sense of behaviour being beyond their control.

From a gambling harm perspective, the issue is significant. Dopamine reinforces behaviours associated with anticipation and reward. Activities like online casino games, slot play and sports betting already “hit” our dopamine receptors.

These drugs artificially amplify the system. This can heighten impulsivity and reduce inhibition. Potentially, a person becomes more vulnerable to high-risk gambling activity.

Impulse Control

Clinical data suggests impulse control disorders affect roughly one in six Parkinson’s patients taking dopamine agonists. In medical classification terms, that would be considered “very common”. However, critics argue that patient information leaflets do not explicitly spell out the potential for severe gambling addiction. Instead, there are often warnings that use broader terms like “impulsive behaviour” or “increased libido”.

Information Availability

The Medicines and Healthcare products Regulatory Agency (MHRA) has stated that any safety decisions need to happen after careful review of available evidence. It’s clear that leaflets cannot list every individual behavioural outcome. Nevertheless, pressure is mounting for clearer warnings.

The chair of the Health Select Committee has reportedly asked for a regulatory review. The government has described the BBC’s findings as “hugely concerning”.

For the gambling sector, the story shows how complex gambling is. It means that not all harmful gambling behaviour originates in typical risk factors. In some cases, it may be linked to prescribed medication affecting brain chemistry.

Anyone taking dopamine agonists should see their GP if they notice behavioural changes. There is support available for those experiencing gambling-related harm through NHS services and specialist charities.