The One-Stop Shot: Why Coadministration Is the New Standard for Busy Pharmacies

As the health care system braces for the annual convergence of respiratory viruses, a "one-stop shop" approach to immunization is moving from a convenience to a clinical necessity. The practice of coadministration—administering multiple vaccines during a single visit—is now a cornerstone of public health strategy, supported by robust safety data and recognized as a vital tool for pharmacies managing high patient volumes.^1,2

For the modern pharmacist, the "twindemic" of influenza and COVID-19, now joined by respiratory syncytial virus (RSV), creates a logistical challenge. However, federal guidelines and clinical evidence suggest that doubling or even tripling shots is not only safe but is also a best practice for ensuring communities remain protected.^1-3

The Data: Safety in Numbers

The shift toward simultaneous vaccination is rooted in significant clinical evidence. According to the CDC, the simultaneous administration of vaccines is a common clinical practice.¹ Although some might worry that multiple injections could overwhelm the immune system or lead to adverse effects, the data suggest otherwise.

A key CDC study regarding the coadministration of influenza and COVID-19 monovalent vaccines found that while patients were slightly more likely to experience systemic reactions such as fatigue, headaches, and muscle aches, these symptoms were generally mild and resolved quickly. Crucially, there is no recommended waiting period between these 2 vaccinations; if a patient is eligible for both, they can receive them immediately.¹

The data for the newer RSV vaccines are similarly encouraging. Although RSV vaccines are relatively new to the market, clinical trials have shown that coadministering them with flu vaccines is safe. The adverse events reported during these trials were similar to those observed when the vaccines were administered separately, though some data suggest a slight increase in injection-site reactions. While safety monitoring is ongoing, the CDC currently maintains that getting an RSV shot and a flu shot at the same visit is a valid and acceptable option for eligible patients.¹

Why Pharmacies Need "One-and-Done" Visits

For busy pharmacies, the value of coadministration is largely found in efficiency and patient retention. The primary goal of health care providers is to get patients up to date on all due vaccines in a single visit. This strategy addresses a common reality in community health: Many patients who leave without a scheduled second appointment may not return for additional vaccinations later in the season.¹

By offering flu, COVID-19, and RSV vaccines simultaneously, pharmacies can maximize their impact during peak windows, such as October, when flu shots are most highly recommended. This "one-trip" approach reduces the administrative burden of scheduling multiple appointments and simplifies the workflow for pharmacy staff who are often operating at a breaking point during winter surges.

Furthermore, the American Medical Association (AMA) notes that increasing the likelihood that a patient is fully vaccinated in a single visit directly supports the broader health care system. When more people are vaccinated against influenza and COVID-19, it reduces the overall rate of hospitalizations and deaths, preventing the system from becoming overwhelmed by preventable respiratory illnesses.²

Clinical Precision: Best Practices for Administration

While the data support coadministration, the physical delivery of these vaccines requires precision. To help providers identify the source of any potential local reactions, the CDC and AMA recommend that vaccines given by needle at the same visit should be administered in separate locations on the body, at least 1 inch apart.^1,2

For adults, this can mean using different arms or placing 2 injections in the same arm, provided they are sufficiently spaced. However, there is a specific nuance for adjuvanted or high-dose vaccines. Adjuvants are ingredients that help promote a stronger immune response. When these are administered alongside COVID-19 vaccines—which are also known to cause local reactions—it is recommended to use separate limbs if possible.²

Documentation also plays a critical role in the busy pharmacy environment. Providers are urged to record the precise location of each injection in the patient's chart. This ensures that if a patient reports a reaction later, the pharmacist can accurately identify which vaccine was responsible.²

Navigating Exceptions

Although coadministration is widely applicable, clinical guidance does highlight rare exceptions. Children with specific medical conditions, such as asplenia, HIV infection, or complement component deficiency, may have different requirements for vaccines such as the pneumococcal 13-valent conjugate vaccine and the quadrivalent meningococcal conjugate vaccine. Additionally, most injectable live vaccines that are not administered on the same day generally require a 28-day separation period.²

However, for the vast majority of the population seeking seasonal protection, the message from health authorities is clear: Get vaccinated for everything you are eligible for as soon as possible.

The Bottom Line

As peak viral activity varies from year to year, with flu peaks occurring anywhere from December to March, maintaining a flexible and efficient vaccination strategy is paramount. Coadministration offers a scientifically backed solution that serves both the patient's need for convenience and the pharmacy's need for operational efficiency. By turning a 3-visit process into a single interaction, pharmacies can play a decisive role in curbing the impact of seasonal respiratory viruses and keeping the public healthy.

REFERENCES

1. Getting a flu vaccine and other recommended vaccines at the same time. CDC. September 17, 2024. Accessed June 16, 2026. https://www.cdc.gov/flu/vaccines/coadministration.html

2. Berg S. What to know about coadministration of flu and COVID-19 vaccines. American Medical Association. September 21, 2021. Accessed June 16, 2026. https://www.ama-assn.org/public-health/infectious-diseases/what-know-about-coadministration-flu-and-covid-19-vaccines

3. Tan L, Trevas D, Falsey AR. Adult vaccine coadministration is safe, effective, and acceptable: results of a survey of the literature. Influenza Other Respir Viruses. 2025;19(3):e70090. doi:10.1111/irv.70090