Jun 14, 2022 - Health

Few get COVID "rebound" cases after taking Paxlovid, study finds

Illustration of a magnify glass over a pill.
Illustration: Eniola Odetunde/Axios

Despite many reports of "rebound" cases of COVID in people who've taken Pfizer's antiviral treatment, a Mayo Clinic study out today found the phenomenon appears to be relatively rare.

Details: The team looked at the outcomes of 483 patients treated with the five-day oral regimen of nirmatrelvir and ritonavir, which are marketed together as Paxlovid to treat early-stage COVID.

  • Only four patients (less than 1%) experienced a return of symptoms after the regimen and symptoms were "generally mild" and resolved without additional therapy.
  • The majority of the patients in the Clinical Infectious Diseases study (93%) and all four patients who experience rebound symptoms were vaccinated.
  • A limitation of the study, the authors wrote, was an underrepresentation of immunocompromised individuals.

The bottom line: This data indicates the idea of extending the duration of Paxlovid treatment to reduce rebound cases may not be necessary.

  • Identifying factors for increased risk of rebound, and changing treatment accordingly, would make more sense, they said.

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