The Queenstown bar patron was taken outside by friends and became unresponsive.
Queenstown police are warning of the dangers of taking illegal drugs after a man had a seizure in a downtown bar this morning.
Sergeant Steve Watt said police assisted paramedics who attended the 28-year-old, who began having seizures in a Camp St bar about 3.25am.
"He was taken outside by friends, where he became unresponsive.''
Police were told the man had taken a gram of MDMA.
"Ambulance were called, and after some time the male became semi-conscious and responding to voice commands.''
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Watt said the consequences of taking drugs were more serious than commonly believed.
Drugs were often not what sellers purported them to be, and instead could be a "concoction of chemicals'' that were extremely harmful and could cause extreme reactions.
A 52-year-old Arrowtown man was arrested about noon yesterday after he was found carrying 4.18gm of methamphetamine.
The man appeared in the Queenstown District Court on a charge of possession of methamphetamine, and was remanded on bail.
Police officers are actively searching for the escapee.