Such thefts have increased across Scotland in recent weeks, with fears that it is being used to power boy racers' cars or as a recreational drug.

BBC: Borders 'laughing gas' found at roadside

Authorities in the Indian state of Bihar have imposed restrictions on the sale of a cough syrup after reports that it was being widely used as a recreational drug.

BBC: India state restricts 'addictive' cough syrup sale

The concern is that lorcaserin has the potential to cause mind-altering effects that might lead to diversion of the prescription drug for recreational purposes.

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