Influenza is generally a self-limited illness, but pneumonia, respiratory failure, and death can occur, especially in persons at increased risk for influenza complications (see Table 1). Updated information on influenza activity and antiviral resistance is available from the CDC at cdc.gov/flu.

The oral polymerase acidic endonuclease inhibitor baloxavir marboxil (Xofluza — Genentech) is now FDAapproved for post-exposure prophylaxis of influenza in patients ≥12 years old. Baloxavir was approved for treatment of acute uncomplicated influenza in patients ≥12 years old in 2018.1 Two neuraminidase inhibitors are FDA-approved for prophylaxis of influenza: oseltamivir (Tamiflu, and generics) in patients ≥1 year old, and zanamivir (Relenza) in patients ≥5 years old.2 Unlike oseltamivir and zanamivir, baloxavir is not FDA-approved for pre-exposure prophylaxis of...

View the Comparison Chart: Antiviral Drugs for Seasonal Influenza for 2024-2025

Remdesivir (Veklury – Gilead), an investigational antiviral drug administered by IV infusion, is now available through an FDA Emergency Use Authorization (EUA) for treatment of COVID-19 in all hospitalized patients. An earlier EUA limited use of the drug to patients hospitalized with severe disease.

In the printed version of our article entitled Antiviral Drugs for Influenza for 2023-2024 in issue 1689 (Med Lett Drugs Ther 2023; 65:177), the clinical studies section should have included a meta-analysis of 15 randomized trials in 6295 outpatient adolescents and adults with influenza that found that use of oseltamivir did not reduce the risk of hospitalization in the overall population or in those ≥65 years old compared to placebo or standard of care. It has been added in the online version of the article.

Healthcare providers are often asked if drugs can be used past their expiration date. Because of legal restrictions and liability concerns, manufacturers do not sanction such use and usually do not comment on the safety or effectiveness of their products beyond the date on the label. Since our last article on this subject, more data have become available.

Annual vaccination in the US against influenza A and B viruses is recommended for everyone ≥6 months old without a contraindication. Influenza vaccines available in the US for the 2024-2025 season are listed in Table 2.

The FDA has approved the hypoxia-inducible factor prolyl hydroxylase inhibitor (HIF-PHI) vadadustat (Vafseo – Akebia) for oral treatment of anemia due to chronic kidney disease (CKD) in adults who have been on dialysis for at least 3 months. Vadadustat is the second HIF-PHI to be approved in the US for this indication; daprodustat (Jesduvroq) was approved earlier, but it was withdrawn from the US market in 2024 for commercial reasons.