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Italy probes Biogen for allegedly hindering sales of rival’s MS drug

By Thomson Reuters May 27, 2026 | 1:26 AM

MILAN, May 27 (Reuters) – Italy’s antitrust authority (AGCM) said on Wednesday it had opened an investigation into Biogen Italia and its U.S. parent Biogen ​over allegedly trying to prevent rival drugmaker ‌Sandoz from offering a cheaper multiple sclerosis drug.

Biogen said in an emailed statement that it was “fully cooperating with the authorities” and confirmed representatives of the AGCM visited its Milan offices ‌on ​Tuesday morning.

Treatment with natalizumab, the ⁠active ingredient in the ⁠MS drug, can cause a rare collateral effect. This means patients have to undergo a specific test – known as anti-JCV – before and periodically during ​the therapy, to assess the risks.

AGCM said Biogen allegedly used its anti-JCV Stratify test to exclude ⁠or limit competition from Sandoz ⁠by tying the use of the test ​to the purchase of its own medicine – Tysabri – and ​refusing to make it commercially available to patients ‌treated with the competitor’s biosimilar drug – Tyruko.

Biogen’s policies are also limiting potential savings for Italy’s national health service, the watchdog said, noting that Sandoz’s drug ⁠could cost at least 20% less than Biogen’s.

The treatments are exclusively carried out in public hospitals, over long therapy cycles, ⁠with each ‌pack costing more than €1,000 ($1,164).

“The use of ⁠biosimilars is fundamental for stronger market competition, ​and ‌the resulting savings are crucial to ​ensure the ⁠sustainability of the national health system and to fund access to more innovative therapies for a growing number of patients,” the regulator said in a statement.

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(Reporting by Cristina Carlevaro, editing by Giulia Segreti ​and Alexander Smith)