Ecstasy tablets six times stronger than normal have been sold in the west of Scotland, according to police.
Detectives issued the warning after the deaths of two men in Ayrshire, which they believe are linked to the drug.
The dead men have been named as Lee Dunnachie, 22, and 19-year-old Steven Kelly.
No direct connection has been established between them and police are looking into how widely the tablets have been distributed.
The deaths are believed to have occurred several miles apart, in Prestwick and in the village of Patna.
http://www.bbc.co.uk/news/uk-scotland-glasgow-west-14006489