Out of the pipeline: Remdesivir

Randomized placebo-controlled trial results

The Adaptive COVID-19 Treatment Trial (ACTT), sponsored by the National Institute of Allergy and Infectious Diseases, is a randomized, double-blind, placebo-controlled trial conducted by Gilead Sciences. The study began in February and evaluated up to 10 days of remdesivir treatment—200 mg IV once daily for 1 day followed by 100 mg IV once daily for 9 days in hospitalized adult patients with COVID-19. Patients were enrolled in a 1:1 manner to remdesivir or placebo, and time to recovery within 28 days after randomization was the trial’s endpoint. According to preliminary analysis of 606 recovered patients, recovery took a median of 11 days in the remdesivir group and 15 days in the placebo group (hazard ratio, 1.31; 95% confidence interval (CI), 1.12‒1.54; P<.001). Mortality rates were 8.0% and 11.6% in the remdesivir and placebo groups, respectively (P=.059).¹

5 vs 10 days of remdesivir treatment

The Gilead Sciences‒sponsored study GS-US-540-5773 was a randomized, open-label multicenter trial of patients with severe COVID-19. A total of 197 adult patients received 10-day remdesivir treatment (200 mg IV once daily for 1 day followed by 100 mg IV once daily for 9 days). An additional 200 adult patients received 5-day remdesivir treatment (200 mg IV once daily followed by 100 mg IV for 4 days). Both groups also received standard of care. Results suggested that patients receiving 10 days of remdesivir had similar improvement in clinical status compared with those receiving a 5-day treatment course (10-to-5 day odds ratio, 0.76; 95% CI, 0.51‒1.13] on day 14).¹ Improvement in clinical status was defined as an improvement of 2 or more points from baseline on a predefined 7-point scale that ranged from hospital discharge to increasing levels of oxygen support to death. Clinical recovery was achieved if patients ceased the need for oxygen support or were discharged.¹

The time to clinical improvement for 50% of patients was similar in each treatment group (10 days in the 5-day group versus 11 days in the 10-day group). By day 14, observed clinical improvement rates were 65% and 54% in the 5- and 10-day treatment groups, respectively. Clinical recovery rates were 70% and 59% in the 5- and 10-day treatment groups and mortality rates were 8% and 11%.¹

Adverse events

The use of remdesivir is contraindicated in patients who are hypersensitive to the drug. Its infusion may cause hypotension, nausea, vomiting, diaphoresis, and shivering. If signs of a clinically significant infusion reaction are observed the infusion should be discontinued. As noted above, elevation in ALT levels occurs with remdesivir treatment.¹

Reporting serious adverse events. If a serious and unexpected adverse event occurs and appears to be associated with the use of remdesivir, the prescribing health care provider and/or the provider’s designee should complete and submit a MedWatch form to the FDA using one of the following methods¹:

• Complete and submit the report online: www.fda.gov/medwatch/report.htm
• Return form FDA 3500 (available at http://www.fda.gov/downloads/AboutFDA/ReportsManualsForms/Forms/UCM163919.pdf) to the FDA by mail (MedWatch, 5600 Fishers Lane, Rockville, MD 20852-9787) or fax (1-800-FDA-0178)
• Gilead requests that all FDA MedWatch forms also be returned to Gilead Pharmacovigilance and Epidemiology: fax: 1-650-522-5477 726; e-mail: Safety_fc@gilead.com

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