Scotland Yard said the suspect, 30, of Bromley in south London, was arrested Friday on suspicion of contamination of goods. He is detained in a police station in south London.

Reckitt Benckiser, the manufacturer of the drug, recalled the product on Aug. 26 and arrested for distribution after the discovery of five boxes contained drugs from other companies.

It is estimated at about 250 000 packages were still in the hands of customers.

Four of the boxes in question were found to contain the antipsychotic drug Seroquel and 50mg of Pfizer package contained anti-epileptic drug, Neurontin, 100 mg capsules.

Specialist Crime Met (SCD), which deals with serious and organized crime, is a leading sensor, and studied the entire production of drugs as part of research.