Stronger MDMA 'causing more mental issues'

There's a warning that increasingly strong ecstasy and MDMA is causing the biggest risk to users' mental health in decades.

Ecstasy is getting stronger and experts are worried the negative effects the drug has on people are getting worse.

Professor Philip Murphy, who's been researching the drug for nearly 20 years, says the he's worried about the supply currently on the market.

Users have told Newsbeat's Jim Connolly about the effects taking the drug has taken on them.