1. Warning Signs

2. Wonder drugs


3. Dopamine Hits


4. Big Pharma, Big Secret


5. Restless


6. Chasing Losses


16 February 2026


When Freddie's father Bill is identified with Parkinson's, his gives him a brand-new lease of life. He begins ticking things off his retiree pail list - travelling, sky diving, golf.


But then Freddie notifications that his previously reasonable daddy has actually begun behaving abnormally.


BBC Investigations correspondent Noel Titheradge has invested more than a year talking to people whose behaviour changed drastically after taking a category of prescription drugs called dopamine agonists.


These drugs boost dopamine activity in the brain - they were recommended more than 1.5 million times in the UK last year to treat Parkinson's disease and other motion conditions.


But they have well recognized negative effects - around 1 in 6 individuals who take them establish impulse control conditions, which can consist of hypersexuality, binge consuming, compulsive gaming and shopping.


If these negative effects have been understood about for years, why weren't some clients and their families correctly warned or monitored?