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# Safety Alert on Remdesivir Interactions
- URL: https://www.fdaweb.com/safety-alert-on-remdesivir-interactions/
- Published: 2020-06-15T12:00:00.000Z
- Updated: 2026-09-14T16:18:10.000Z
- Author: David McFarland
- Tags: Drugs, #legacy-id-D5147008

A new FDA [safety alert](http://s2027422842.t.en25.com/e/es?s=2027422842&e=342405&elqTrackId=376c7bc788024cd5a73d955f2e3dcbdc&elq=8e0d5dd03b4e4b179df9ecc32a4f9b2c&elqaid=12942&elqat=1&ref=fdaweb.com) is warning health care providers about a newly discovered potential drug interaction with Gilead Sciences’ investigational antiviral drug remdesivir, which has received emergency use authorization for treating hospitalized Covid-19 patients with severe disease ([see earlier story](https://www.fdaweb.com/fda-green-lights-remdesivir-for-covid-19-emergency-use/)). “Based on a recently completed non-clinical laboratory study, the FDA is revising the [fact sheet for health care providers](http://email.prnewswire.com/ls/click?upn=3slWLw94I3jq-2B-2FedjFNgZAmdierth9sDznGHUIlSHO-2BuxBmeJjc1eXqRkC-2FtOCUfAI9j%5Ff0D7hj0BJ4b-2F7NuVqzPDs7FGiq8VLIwAX0sPSotqoLJejYqb1dmQHyCXe45PgGWVLgRwTJfe8a7CK6O-2B8WIrNL6Y6zDdBBpfcatzz2IYR1KD-2FI3csEpinxVd-2BN7CRB9e5U5MMa3rh1ESrfg-2Bf7N3WQ01XV33O6TgmSuVoloFSvnLQqHt4BLGOIRmnq7ClM5ZUHKLAxTra5b2Vi-2BsavIVuLoTMwycEX-2BZr8uNWFNkZP8XBYVUxjofvITIoJ69bR4i8S9rblOrb6MD7yKSqz-2FCRxQoTzqI9my3u1vrdD2hG2Jirc59-2BLlu0TbnJAeCI-2Bu7SU6oB0yMRxFvKqlwyWyAGefExPHfJBfG184UbTYWBGs-3D&ref=fdaweb.com) that accompanies the drug to state that co-administration of remdesivir and chloroquine phosphate or hydroxychloroquine sulfate is not recommended as it may result in reduced antiviral activity of remdesivir,” the alert says. Additionally, FDA revised the fact sheet for health care providers to clarify dosing and administration recommendations and to provide additional safety data and supporting data from clinical trials conducted by both NIH and Gilead.