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A Â鶹Éç investigation has heard from hundreds of people who say they developed sex and gambling addictions after taking a category of prescription drugs called dopamine agonists.

Millions of people in the US and around the world have been prescribed these medications, which are used to treat various illnesses, from Parkinson’s to depression. But they have well-established side effects: around 1 in 6 people who take them develop impulse control disorders.

Noel Titheradge, investigations correspondent, shares the story of one American woman who developed hypersexuality after she took a dopamine agonist drug. Like many of the patients Noel has spoken to, she says she was not warned that her medication could dramatically change her personality.

Noel’s investigation is also a Â鶹Éç podcast series. Search for ‘Shadow World: Impulsive’.

If you have any concerns about medication you’re taking, speak to your doctor. For further information on the issues raised in the programme, contact support organisations in your own country. For a list of organisations in the UK that can provide support go to bbc.co.uk/actionline.

Producers: Viv Jones

Executive producer: Bridget Harney

Mix: Travis Evans

Senior news editor: China Collins

Photo: A mixture of pills. Credit: Lauren Hurley/PA Wire