Advances in science have meant that people can access a wider range of medication than ever before. Even prescription medication that can help us carries dangers, though.
There is now more awareness around certain medications, such as opioid painkillers and benzodiazepines.
Another type of medication causing concerns around side effects and addiction risks is dopamine agonists. This type of medication is highly effective and was prescribed more than 1.5 million times in England last year, but there are rising questions about how it can harm people.
It’s better to have all the information, so you should know about dopamine agonist side effects, whether they are addictive and how you can get help.
What Are Dopamine Agonists?
Dopamine agonists are drugs that work by mimicking dopamine in your brain. They bind to and activate dopamine receptors to help produce the effects of the transmitter that you produce naturally.
They are used to treat conditions such as Parkinson’s Disease and Restless Leg Syndrome (RLS), which result from low dopamine levels in the brain.
How Dopamine Affects Behaviour
Dopamine is a chemical that transmits messages between nerve cells. It is known as the ‘pleasure hormone’ because when you do something you find enjoyable, your brain is flooded with dopamine, producing feelings of pleasure and satisfaction.
Studies have found that dopamine affects motivation, helping your brain decide if tasks are worth the effort and driving your willingness to pursue goals.
Too much of a good thing can be bad, and altering dopamine levels reinforces motivation to engage in behaviours that release it, hijacking your reward system. This can bring about changes to your behaviour as well as cause physical symptoms.
Are Dopamine Agonists Technically Addictive?
Dopamine agonists are not as addictive in the same way as prescription drugs like opioids, illegal substances and alcohol.
The drug itself does not cause a high or sense of euphoria that you then chase, like with other substances. Instead, dopamine agonists can cause impulse control issues, leading to you engaging in behavioural addictions.
There is also a danger of withdrawal when you stop taking it, which may cause people to continue taking the medication despite the negative effects.
What Are Impulse Control Disorders (ICDs)?
Impulse Control Disorders (ICDs) are a range of behavioural conditions that lead a person to be unable to resist urges and engage in behaviours that can be destructive to themselves and others.
Behaviours linked to ICDs include:
- Gambling addiction
- Compulsive shopping
- Hypersexuality
- Stealing
- Binge eating
Developing an impulse control disorder due to medication is a recognised side effect in some patients, with it thought that one in six people taking dopamine agonists experience impulse control disorders.
Why These Medications Can Lead to Compulsive Behaviour
If you do something you enjoy, liking shopping, winning on a bet or eating your favourite food, your body responds by the brain getting a rush of dopamine. This is the pleasure you feel.
As dopamine makes you feel enjoyment, it is also involved in causing you to want, desire and seek out behaviours that produce this enjoyment. When a dopamine agonist raises your dopamine levels, it can overstimulate your reward system and affect your impulse control.
Your brain quickly finds a more direct path, and you lose the ability to consider more beyond the idea that eating this cake will give you pleasure, so I’ll keep eating cake. You lose the ability to deny yourself, instead always going for the thing that gives you instant gratification.
Dopamine Dysregulation Syndrome
Dopamine Dysregulation Syndrome (DDS) is a rarer and severe condition that people who have been taking dopamine agonists for a long time can develop. It occurs due to the excessive stimulation of your reward system, caused by the medication, making you oversensitive to the rewarding effects.
People with DDS may suffer from symptoms such as compulsive shopping, gambling, hypersexuality, and compulsive medication overuse.
What Does Recent Research and News Say?
There is growing scrutiny and investigations into these medications. A study in 2025 found that even small doses of a dopamine agonist may cause an impulse control disorder in some of those with Parkinson’s.
The BBC recently investigated the dangers, finding that these side effects are more common than many people are aware of. Behaviour side effects are listed as uncommon, and many patients are not warned about them by their doctor.
The investigation has led the MHRA (Medicines and Healthcare products Regulatory Agency) to begin carrying out a “comprehensive assessment” to decide if action is needed to increase awareness.
With more stories coming out about potential side effects, there is increased awareness among regulators and clinicians. Understanding around the effects of dopamine agonists is evolving, and with more available knowledge, people can make more informed decisions about their treatment.
Who’s Most at Risk?
Certain groups of people may carry a higher ropinirole addiction risk or struggle with other dopamine agonist misuse. These include:
- People who use the drug in high doses
- People who have engaged in long-term use of the medication
- Those with a history or family history of addiction are more likely to be more susceptible to addiction.
- People with a personality that leans towards being more impulsive may be more at risk.
When talking about addiction and side effect risks, it’s important to remember that nothing is set in stone. If you identify with any of these traits, it does not mean you will experience addiction or adverse effects; it just means there may be an increased risk.
Signs to Watch For
If you are worried about dopamine agonist addiction and severe behavioural side effects, there are some signs you should be aware of. When you recognise the signs early, you can take positive steps to ensure that the problem doesn’t worsen.
Signs to watch out for include:
- Gambling with increasing amounts of money
- Spending money excessively and online shopping more
- Binge eating
- Increased thinking or engaging in sexual behaviour that is out of character
- Punding (doing repetitive tasks obsessively, such as sorting, cleaning and hoarding)
What Should You Do If You’re Concerned?
If you are experiencing changes in your behaviour, immediately get in touch with your GP or a specialist. They can help you decide on your next steps.
What you should not do is stop taking your dopamine agonist completely and suddenly. A sudden ending of your consumption can result in severe withdrawal symptoms such as mood swings, depression, panic attacks and vomiting.
You may not be able to immediately see your doctor, so it’s important to speak to friends and your wider support network to help you get through an overwhelming situation.
Support for Behavioural or Medication-Related Dependency
If you are struggling, you don’t have to do it alone. There are many treatment options available, and you can find a path forward that suits your situation. Rehabilitation gives you the chance to access expert treatment in an environment that is judgment-free, confidential and safe.
Beyond professional treatment, you can look to your immediate family and friends for help, as well as to people in the Parkinson’s and RLS communities who may be going through the same issues and can offer advice.
Learn More About Parkinson’s Medication Side Effects Today
Dopamine agonists are effective medications but not entirely risk-free. They can, in some cases, bring on severe behavioural changes that leave you more at risk of abusing the drug and worsening problems.
With more awareness, you can notice danger signs early and take action to prevent the situation from worsening. If your behaviours are feeling difficult to manage, contact Cassiobury Court today. We can offer you confidential, professional support and help you take the first steps.
