Hopes for much-needed answers for families, as a coronial inquest into six sudden epilepsy deaths begins

It comes after New Zealand's drug buying agency Pharmac faced criticism for switching the brand of the drug.

Epilepsy New Zealand's Ross Smith says people taking medication for epilepsy should never have had their medication switched at the counter.

He says the swap should only ever happen after a person has discussed the change with their doctor, who knows their seizure history.