'Explosion' of fake drugs

China ... an expert says it is the No.1 source of counterfeit drugs. Photo: Louie Douvis

The rapid growth of internet commerce has led to an explosion of counterfeit drugs sold around the world, with China the biggest source of fake medicines, pharmaceutical experts said Thursday.

The illicit trade is now believed to be worth around $75 billion globally, with criminal gangs increasingly using the web to move their products across borders, said Scott Davis, Pfizer's top security expert for Asia.

"The internet has led to an explosion of availability of these products," Davis told a health forum in Manila.

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"About 90 per cent of counterfeit drugs ... are at some point marketed and sold on the internet."

He said websites selling fake drugs commonly did not have physical addresses and exploited weak or murky customs regulations to ship their products.

"They are getting more sophisticated," he said, adding that law enforcers were finding it ever more difficult to tell the fake drugs from the real.

"We often have to send the pills to our labs to tell us the difference," he said.

The US pharmaceutical giant Pfizer makes the anti-impotence drug Viagra, which along with Eli Lilly's Cialis are among the world's most widely copied drugs.

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'Explosion' of fake drugs