FluMist (MedImmune), the first live-attenuated and first intranasally administered influenza vaccine, has been approved by the FDA to prevent influenza in healthy people 5-49 years old. Given as a nasal spray, it stimulates immunity by viral replication in the upper respiratory tract. This vaccine apparently will be advertised directly to the public as a "needle-free" alternative to intramuscular influenza vaccine.

FluMist (AstraZeneca), the live-attenuated intranasal influenza vaccine that has been available for years for administration by a healthcare provider in nonpregnant persons 2-49 years old, has now been approved by the FDA for self- or caregiver-administration. It is expected to be available for such use during the 2025-2026 influenza season. FluMist is only available through a healthcare provider this season. It will continue to be available for administration by a healthcare provider in the future

Addendum: FluMist Storage: The storage requirements for FluMist, the intranasal live-attenuated influenza vaccine (Medical Letter 2003; 45:65) have changed. New data have shown that frost-free freezers are appropriate for storage for at least 3 months, without need for a freezer-box insert.

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.

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

The FDA has approved peramivir (Rapivab – BioCryst), an IV neuraminidase inhibitor administered as a single dose, for treatment of acute uncomplicated influenza in patients ≥18 years old who have had symptoms for no more than 2 days. Peramivir was available temporarily in the US during the 2009-2010 influenza season under an emergency use authorization for treatment of hospitalized patients. It has been available in some Asian countries since 2010. Peramivir is the third neuraminidase inhibitor to be approved in the US. Oseltamivir (Tamiflu), which is taken orally, and zanamivir...

Rofecoxib (Vioxx - Merck) has been withdrawn from the market due to an increased risk of cardiovascular complications associated with its long-term use. The question remains whether all selective COX-2 inhibitors carry the same risk. Full-page advertisements in newspapers for celecoxib (Celebrex - Pfizer), the most widely used COX-2 inhibitor, assure the public that it does not.

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 FDA has approved baloxavir marboxil (Xofluza – Shionogi/Genentech), the first polymerase acidic (PA) endonuclease inhibitor, for single-dose, oral treatment of acute uncomplicated influenza in patients ≥12 years old. Baloxavir is the first drug with a new mechanism of action to be approved for treatment of influenza in almost 20 years.

The drugs of choice for treatment of viral infections (other than HIV) and their dosages are listed in Tables 1-6 on the pages that follow. Some of the indications and dosages recommended here have not been approved by the FDA. Vaccines used for the prevention of viral infections are discussed elsewhere.