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Hundreds of websites have been set up to sell counterfeit versions of the drug.

But instead of improving sexual performance the tablets can actually cause impotency and other serious side effects.

The pills sell online for as little as £2 each and have been bought in more than 100 countries, raking in £500million a year for the evil regime.

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Intelligence sources said that North Korea is making a range of conterfeit drugs, DVDs and banknotes to help fund its nuclear weapons programme.

The regime, run by despot Kim Jong-un, is thought to be on the verge of test-firing a long range missile which could hit the USA.

Experts fear it is only a matter of time before it develops the technology to put a nuclear warhead on the rocket.

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Our intelligence source said millions of the fake Viagra tablets are made by a slave labour force in a factory near the capital Pyongyang.

The drugs are tested on the workers, some of whom are said to have died from heart failure and breathing difficulties.

The insider said: “Counterfeiting is a state-funded enterprise in North Korea. They have no real exports so they manufacture lots of fake drugs and target Western markets.

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“Viagra is one of their main drugs. Some versions have been found to contain some of the ingredients that are in real Viagra but North Korean Viagra has not been clinically tested so you have no idea what you are taking.”

Fake Viagra can cause “visual problems, fainting, dangerous changes in blood pressure and heart problems” the source said. And it can make erectile dysfunction worse.

Our insider added: “People have complained that their penis size has reduced after taking the fake drug.”

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Dr Tommy Dolan, from Viagra manufacturers Pfizer, said it is hard to tell fake pills from the genuine item as they are the same blue diamond shape and often branded with the firm’s logo.

It is believed people buy Viagra online because they are too embarrassed to ask their GP for it. Also, the NHS will only issue four pills at a time.

Drugs regulators warned last year that organised crime gangs are moving from narcotics into the world of unlicensed medicines.