Police have issued an urgent warning after two Dorset men collapsed while taking an illegal drug called Thai Valium.
The pair fell unconscious and were rushed to Poole General Hospital at 6pm yesterday.
Detectives fear other people could take the potentially harmful substance.
One of the men, aged 41, remains sedated and is in a stable condition, while the other, 28, came to but was kept in overnight to be monitored.
Officers were called by South West Ambulance Service paramedics who were treating the men in Ashley Cross, Parkstone.
Detective Inspector Stewart Dipple said: "We cannot confirm at this stage if it is the controlled drug that has made the two men unwell, or if it was the quantity of tablets that were taken that caused them to fall ill.
"Our primary concern is to prevent other people potentially falling ill from taking the same drugs.
"The drug is described as a blue capsule of Thai Valium and is believed to come in blister packs of 10.
"It is not believed to be a prescribed drug or treatment, but rather an illegally supplied controlled drug.
"It is vital that any members of the public who purchased a similar drug do not to take them, and to keep them safe from others.
"They should be safely deposited at a police station, a hospital or medical facility, or a drug clinic."
Anyone with information about the supply of the tablets should contact Dorset Police on 101, quoting incident number 09:373, or phone Crimestoppers anonymously on 0800 555 111.