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.

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"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.