Three deaths have been reported to the Centre for Adverse Reactions Monitoring after Pharmac forced patients using the medicine Lamotrigine to switch brands.
About 11,000 people - most with epilepsy but some with mental health conditions - are switching to a generic form of the drug, called Logem.
Three deaths have now been reported as possible outcomes from the switch to the new drug.
RNZ In Depth investigative journalist Guyon Espiner joins Lisa Owen in studio to discuss the details.
