The Competition and Markets Authority (CMA) has closed its investigation into a suspected anti-competitive discount scheme developed by Merck Sharp & Dohme (MSD) after finding no grounds for action.

The case began when the CMA claimed the discount scheme was designed to delay or reduce competition from other suppliers of MSD’s Remicade (infliximab), a drug used to treat chronic illnesses such as Crohn’s disease and rheumatoid arthritis.

MSD allegedly introduced the discount scheme after Remicade’s patent expired in early 2015 in an attempt to ensure the NHS would continue to use mostly Remicade, rather than competitors’ newer and cheaper versions - biosimilars - of infliximab

By linking the level of discount offered on Remicade to the total amount of the drug purchased, the scheme - when coupled with caution in the NHS over moving away from tried and tested drugs – was designed to dissuade the NHS from trialling biosimilars, regardless of the potential savings.

Had it been successful, MSD’s discount scheme could have delayed the NHS from benefitting from increased competition and making significant savings on what it spent on Remicade, which, at the time, was over £100 million annually.

In May 2017, the CMA provisionally found that MSD had a dominant market position and that its discount scheme for Remicade, was in breach of competition law, but the case decision group appointed to decide the case has now reached a final decision that there are no grounds for it to take action.

After considering further evidence, the group concluded that MSD’s scheme "was not, in practice, likely to limit competition from others - the legal test for finding MSD’s conduct to be unlawful".

"This is because, at the time that the discount scheme was introduced, the market worked differently from the way MSD had envisaged when it designed the scheme," it noted.

The CMA’s said its investigation "serves as a warning to businesses which design discount schemes to protect their dominant market position, that they risk breaching UK competition law: had MSD’s scheme in practice been likely to prevent or limit competition from rivals, the company could have faced severe financial penalties".