A group of doctors has filed a lawsuit against the Biden administration claiming it unlawfully attempted to block the use of ivermectin in treating COVID-19.

It names the Department of Health and Human Services, HHS Secretary Xavier Becerra, the Food and Drug Administration, and FDA Commissioner Robert M. Califf as defendants.

In the filing, plaintiffs Mary Talley Bowden, Paul E. Marik, and Robert L. Apter argued that by publicly ordering health professionals and patients to avoid ivermectin, the FDA both acted outside of its authority and inhibited the doctors’ ability to practice medicine.

Though the FDA has approved ivermectin to treat certain infections, the department has urged the public not to use the drug to treat COVID-19. Neither HHS nor the FDA  immediately responded requests for comment for this story.