The World Health Organization (WHO) has decided to discontinue hydroxychloroquine and lopinavir/ritonavir arms in its Solidarity Trial, which is being conducted to assess potential treatments for hospitalised Covid-19 patients.

The decision is based on the trial’s International Steering Committee recommendation that comes after review of interim data from these treatment arms.

Discover B2B Marketing That Performs

Combine business intelligence and editorial excellence to reach engaged professionals across 36 leading media platforms.

Find out more

According to the committee, the data revealed that hydroxychloroquine and lopinavir/ritonavir demonstrated little or no decreased in the mortality of hospitalised patients with Covid-19, compared to standard of care.

WHO said in a statement: “The International Steering Committee formulated the recommendation in light of the evidence for hydroxychloroquine vs standard-of-care and for lopinavir/ritonavir vs standard-of-care from the Solidarity trial interim results, and from a review of the evidence from all trials presented at the 1-2 July WHO Summit on Covid-19 research and innovation.”

WHO noted that the trial investigators will discontinue the arms with immediate effect.

The organisation added that the interim data showed no ‘solid evidence’ that these drugs increased mortality. However, certain related safety signals were observed in the clinical laboratory findings of the add-on Discovery trial, a participant in Solidarity.

GlobalData Strategic Intelligence

US Tariffs are shifting - will you react or anticipate?

Don’t let policy changes catch you off guard. Stay proactive with real-time data and expert analysis.

By GlobalData

This decision to discontinue the arms is applicable only to the the Solidarity trial in hospitalised patients and not the potential assessment in other studies of these drugs in non-hospitalised patients or as pre- or post-exposure prophylaxis for Covid-19.

Last month, the National Institutes of Health (NIH) in the US and pharmaceutical company Novartis also suspended their respective trials of hydroxychloroquine in Covid-19 patients.

In addition, data from a RECOVERY clinical trial being conducted in the UK showed no benefit with lopinavir/ritonavir in patients hospitalised with Covid-19.

Clinical Trials Arena Excellence Awards - Nominations Closed

Nominations are now closed for the Clinical Trials Arena Excellence Awards. A big thanks to all the organisations that entered – your response has been outstanding, showcasing exceptional innovation, leadership, and impact.

Excellence in Action
Recognised with 2025 Excellence Awards for Research and Development and Marketing , Novotech converted FDA/EMA fast track designations into faster HDV trial timelines while translating complex HBV science into sponsor ready insights. Discover how this dual strength in execution and communication is reshaping liver disease clinical development.

Discover the Impact