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Emergency services were called to Ashley Cross in Poole on Saturday evening after a report of two men falling unconscious having believed to have taken a controlled drug.
The drug taken is not believed to be a prescription drug or treatment.
The two men, aged 28 and 41, were taken to Poole General Hospital.
The 28-year-old man regained consciousness and both were kept in overnight to be monitored. The 41-year-old man remains sedated and his condition is described as stable.
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
Anyone with any information regarding the supply of such tablets should contact Dorset Police on telephone number 101,
quoting incident number 09:373, or phone Crimestoppers anonymously on 0800 555 111.