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Simvastatin, a widely available and inexpensive drug that is included on the WHO list of essential medicines, was shown to have a high probability (96%) of improving outcomes (a combination of survival and length of time patients need support in an intensive care unit) when started as a treatment for critically ill patients with COVID-19, and a 92% chance of improving survival at 3 months. This equates to one life saved for every 33 patients treated with simvastatin. 2,684 critically ill patients were included at 141 hospitals across 13 countries.

Vitamin C is widely available around the world and was used in some settings for the treatment of COVID-19. Through harmonising two clinical trials – REMAP-CAP and LOVIT-COVID – over 2,500 patients in 20 countries took part, including both critically ill and non-critically ill patients with COVID-19 in hospital. It was shown that high-dose vitamin C did not improve outcomes for patients. This is the largest trial examining high-dose vitamin C in COVID-19 and provides evidence that high-dose vitamin C is not beneficial and suggests a high probability that it may be harmful.

In this letter we show that in patients who became critically ill while receiving therapeutic-dose heparin initiated when non-critically ill, continuation of therapeutic-dose compared with the lower doses confers no clinical benefit and appears harmful.

In this randomized clinical trial that included 779 patients, initiation of an ACE inhibitor or ARB did not improve organ support–free days. Among critically ill patients, there was a 95% probability that treatments worsened this outcome.

Administration of either tocilizumab or sarilumab was associated with lower 28-day all-cause mortality compared with usual care or placebo. The association is not dependent on the choice of interleukin-6 receptor antagonist.

Among critically ill adults with confirmed COVID-19, treatment with convalescent plasma had a low likelihood of providing improvement in organ support–free days.

In noncritically ill patients with Covid-19, an initial strategy of therapeutic-dose anticoagulation with heparin increased the probability of survival to hospital discharge with reduced use of cardiovascular or respiratory organ support as compared with usual-care thromboprophylaxis.

In critically ill patients with Covid-19, an initial strategy of therapeutic-dose anticoagulation with heparin did not result in a greater probability of survival to hospital discharge or a greater number of days free of cardiovascular or respiratory organ support than did usual-care pharmacologic thromboprophylaxis.

This collaborative meta-analysis of 28 published or unpublished RCTs, including 10,319 patients, shows that treatment with HCQ was associated with increased mortality in COVID-19 patients, and there was no benefit from treatment with CQ.

This living guideline from the World Health Organization (WHO) incorporates a new recommendation on molnupiravir for covid-19 and updates existing recommendations. The GDG typically evaluates a therapy when WHO judges sufficient evidence is available to make a recommendation.