<p>Impulse control disorders are a common side effect of dopamine agonist drugs - it’s generally accepted that they will affect around 1 in 6 people taking these drugs for Parkinson’s.</p><p>So why are these side effects so hard to talk about? How can people get past their guilt and shame to access the support they need?</p><p>And if subtle changes in the activity of chemicals in our brain can cause us to behave so differently - what is personality?</p><p>Details of organisations offering help and support with some of the issues raised are available at bbc.co.uk/actionline.</p><p>If you have any concerns about medication you’re taking, speak to your doctor.</p><p>Presenter: Noel Titheradge Producer: Lucy Burns Editor: Matt Willis A BBC News Long Form Audio production</p>