Pfizer's antiviral Covid-19 pill is a big deal. Here's why.

By Pamela Divack 

It's not common to see clinical trials stop early for results being so overwhelmingly positive, especially when creating novel treatments in a global pandemic. But we have now seen it twice, first with the Merck antiviral pill and now with Pfizer's antiviral pill. With 89% efficacy at cutting risk of hospitalization or death, there is an exciting opportunity for Pfizer's drug to help provide some calm and confidence in the fight against Covid-19—adding another critical tool to our pandemic toolbox.

The remarkable results from the clinical trial studying Pfizer's Covid-19 pill resonate a clear message: we are experiencing a paradigm shift from focusing on Covid-19 prevention to focusing on mitigation, and it is a big deal. As Pfizer's Paxlovid joins the waiting line for approval in the United States behind Merck's Molnupiravir (which the FDA is meeting to discuss in late November), there are some key considerations to highlight in this promising turning point in the pandemic response.

From prevention to mitigation—a turning point

Pfizer's Paxlovid can be taken orally, while other treatments have required hospitals or infusion centers to administer an IV-based treatment in a narrow time window after diagnosis. With the option to simply take a pill in the few days after symptom onset, patients will have more time and ease with a treatment that could keep them out of the hospital. And that is critically important to move Covid-19 treatment into the comfort of one's own home, especially for the high-risk population the clinical trial analyzed.  

Treatment is only as beneficial as it is available and accessible

Many pieces still need to come together to ensure access. For one, it will be essential that this treatment is affordable and available at local pharmacies. But patients need to know they have tested positive for Covid-19 in the first place, so ensuring people have access to low-cost rapid tests is a necessary aspect of the mitigation phase we are moving towards.

Additionally, open questions about initial supply of Pfizer's antiviral—and exactly what number of doses will be available and whom—will create critical turning points about distribution and access. For example:

• Will doses be reserved for the most high-risk patients (those tested in the trial), or will they be made available on a first-come first-serve basis?
• Is there going to be geographical preference for allocation? Will areas with the highest case rates or hospitalization rates receive supply first?
• Will public and private insurers will fully cover this treatment or demand cost-sharing—and will they restrict access based on patients' vaccination status, pre-existing conditions, age, demographics, or other risk factors?

Whether public and private insurers will fully cover this treatment or demand cost-sharing—and whether they restrict access based on patients' vaccination status, pre-existing conditions, age, demographics, or other risk factors—will play a critical role in determining the treatment's reach. To better inform these decisions, it will be essential for the manufacturers and regulators to collect data to understand the drug's success in a broader range of use cases.

Yes, global equity is still important (and it always will be)

Because the pandemic is global, it is worth questioning how Pfizer plans to make the drug available to nations that are still struggling to vaccinate their populations. While Merck has allowed manufacturers to access patents to their drug to reach less wealthy nations, this second treatment option must also be made available in the global fight against Covid-19. We should pay close attention to the 'tiered pricing approach' they discussed for roll out. The key decision makers, such as manufacturers, insurers, and federal regulators, among others, have an opportunity to prevent inequities upon roll out. Ultimately, if we are not careful, the new antiviral oral treatments for Covid-19 could exacerbate disparities and health inequities.

Parting thoughts

We now have two promising oral antiviral treatments against Covid-19, and with an expected authorization on the near horizon, there is reason to be excited. In the coming weeks, many pieces still need to come together, and we will need more information to determine the future success of the treatment. For example: what does the data show about efficacy in various subpopulations (e.g. age, demographic, comorbidity, vaccination history)? How will regulators and public health experts view Pfizer versus Merck's antiviral pills? What will we learn from the recent authorization of Merck's antiviral in the UK? We continue to assess data, open questions, and challenges.

As we progress forward, if you are a health care leader, now is the time to proactively think about the new frontier of Covid-19 treatment and its impact on your pandemic response.

Andrew Mohama contributed to this piece.