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That term covers a number of different counterfeit versions of anti-anxiety medications, which make users feel spaced out and relaxed.

Cranstoun, a harm reduction charity in the Black Country, said counterfeit drugs were often "much more potent and stronger than the drugs they are masquerading as".

Nigeria's drug authority introduced new regulations for medicines aimed at tackling the importation of counterfeit and sub-standard drugs.

On the topic of counterfeit products Mr Ishihara is more direct, and says the company's legal teams have fought "rigorously" against clones and fakes since the beginning.

Adding to quality concerns are counterfeit drugs, which have seeped into both generic and brand-name drugs markets across the world and are notoriously difficult to detect.