Chukwunonye Madubuike, a former employee of Emzor Pharmaceuticals who was implicated in a BBC investigation into the illegal sale of addictive drugs, has been arrested.

The commissioner of police in Lagos state, Imohimi Edgal, told BBC that Madubuike was arrested in the border town of Idiroko in Ogun state.

He was reportedly heading to Cotonou in neighbouring Benin Republic when he was arrested.

In a documentary titled ‘Sweet sweet codeine’, the BBC had revealed how some corrupt officials of big pharmaceutical companies, including Emzor, conspire with distributors to make codeine, a cough syrup, available in the open market .

Madubuike, who was a business development executive at Emzor, illegally sold 60 bottles of codeine syrup to the BBC team who posed as traders, at a hotel in Isolo, Lagos.

Olajuwon Soyinka, editor of BBC Pidgin, who was among the team which carried out the investigation, later disclosed during an interview with TheCable that he risked his life to expose the drug cartel.

After the film was aired, the pharmaceutical company sacked Madubuike while the federal government subsequently banned the production and importation of codeine in the country.

But Madubuike has been on the run since the documentary was released in May.

Edgal said Emzor had reported Madubuike on suspicion of having “knowingly supplied the controlled drugs to persons who were not supposed to have access to them contrary to Nigerian law”.

The police commissioner said Madubuike confessed that he “was only trying to meet his sales target”, adding that he should have carried out greater checks to verify the identity of the person he was dealing with and “regretted selling controlled substances to unauthorised persons”.

Codeine is a painkiller which is also capable of giving a euphoric feeling if consumed in large quantities.

It is highly addictive and, taken in excess, can have a devastating impact on the mind and body.