EMA Issues Advice for Potential Early Use of Pfizer’s Novel COVID-19 Oral Antiviral Candidate
Pfizer (NYSE: PFE) received favorable advice from the European Medicines Agency's CHMP for its antiviral treatment PAXLOVID, indicating its use for adults at increased risk of severe COVID-19. The CHMP recommends timely administration within five days post-diagnosis. This advice supports EU member states in potential emergency use before official marketing authorization. PAXLOVID demonstrated an 89% reduction in hospitalization or death in clinical trials compared to placebo. Pfizer aims to ensure equitable access and plans to invest up to $1 billion in manufacturing and distribution.
- The CHMP's favorable advice highlights the potential of PAXLOVID to treat high-risk COVID-19 patients.
- Clinical trial results show an 89% reduction in hospitalization or death risk when treated with PAXLOVID compared to placebo.
- Pfizer plans to invest approximately $1 billion to support manufacturing and distribution of PAXLOVID.
- PAXLOVID is currently not authorized for use in the EU, limiting immediate market potential.
- EMA’s CHMP advice states that PAXLOVID™ (nirmatrelvir [PF-07321332] tablets and ritonavir tablets) can be used for treatment of adults with COVID-19 who do not require supplemental oxygen and who are at increased risk of progressing to severe disease
- This advice could support authorities of EU Member States regarding the supply and use of PAXLOVID prior to the grant of EU conditional marketing authorization; rolling review is being conducted by the EMA in parallel
“The CHMP’s advice signifies the strength of our data for PAXLOVID in the treatment of high-risk adults diagnosed with COVID-19,” said
The CHMP based their advice on positive results from the Phase 2/3 EPIC-HR (Evaluation of Protease Inhibition for COVID-19 in High-Risk Patients) interim analysis, which enrolled non-hospitalized adults with confirmed COVID-19 who are at increased risk of progressing to severe illness. The data demonstrated an
About PAXLOVID™ (nirmatrelvir [PF-07321332] tablets and ritonavir tablets)
PAXLOVID is an investigational SARS-CoV-2 protease inhibitor antiviral therapy. It was developed to be administered orally so that, if authorized or approved, it can be prescribed at the first sign of infection or at first awareness of an exposure – potentially helping patients avoid severe illness (which can lead to hospitalization and death) or disease development following contact – subject to the successful completion of the remainder of the EPIC clinical development program. Nirmatrelvir [PF-07321332], which originated in Pfizer’s laboratories, is designed to block the activity of the SARS-CoV-2-3CL protease, an enzyme that the coronavirus needs to replicate. Co-administration with a low dose of ritonavir helps slow the metabolism, or breakdown, of nirmatrelvir in order for it to remain active in the body for longer periods of time at higher concentrations to help combat the virus.
Nirmatrelvir is designed to inhibit viral replication at a stage known as proteolysis, which occurs before viral RNA replication. In preclinical studies, nirmatrelvir did not demonstrate evidence of mutagenic DNA interactions.
Current variants of concern can be resistant to treatments that are focused on the spike protein expressed on the surface of the SARS-CoV-2 virus, due to the mutations in this region. PAXLOVID, however, works intracellularly on the protease of the SARS-CoV-2 virus by inhibiting viral replication. Nirmatrelvir has shown consistent in vitro antiviral activity against the previously identified variants of concerns (i.e., alpha, beta, delta, gamma, lambda, and mu). In addition, nirmatrelvir potently inhibited the 3CL protease associated with Omicron in an in vitro biochemical assay. This indicates nirmatrelvir’s potential to maintain robust antiviral activity against Omicron. Additional in vitro antiviral studies with this variant are underway.
If authorized or approved, PAXLOVID will be administered at a dose of 300 mg (two 150 mg tablets) of nirmatrelvir with one 100 mg tablet of ritonavir, given twice-daily for five days. One box contains five blister packs of PAXLOVID, as co-packaged nirmatrelvir tablets with ritonavir tablets, providing all required doses for a full five-day treatment course.
Our Commitment to Equitable Access
About the EPIC Development Program
The EPIC (Evaluation of Protease Inhibition for COVID-19) Phase 2/3 development program for PAXLOVID consists of three clinical trials spanning a broad spectrum of patients, including adults who have been exposed to the virus through household contacts, as well as adults at both standard risk and high risk of progressing to severe illness.
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For more information on the EPIC Phase 2/3 clinical trials for PAXLOVID, visit clinicaltrials.gov.
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Disclosure Notice
The information contained in this release is as of
This release contains forward-looking information about Pfizer’s efforts to combat COVID-19, Pfizer’s investigational oral antiviral candidate PAXLOVID (including qualitative assessments of available data, potential benefits, expectations for clinical trials, CHMP advice on the use of PAXLOVID for adults with COVID-19 who do not require supplemental oxygen and who are at increased risk of progressing to severe disease, a rolling submission for potential EU conditional marketing authorization, advanced purchase agreements and an agreement with MPP, efforts toward equitable access, the anticipated timing of data readouts, regulatory submissions, regulatory approvals or authorizations, potential to maintain antiviral activity against variants, planned investment and anticipated manufacturing, distribution and supply) and the positive CHMP opinions received by certain of Pfizer’s pipeline of innovative medicines, involving substantial risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. Risks and uncertainties include, among other things, the uncertainties inherent in research and development, including the ability to meet anticipated clinical endpoints, commencement and/or completion dates for clinical trials, regulatory submission dates, regulatory approval dates and/or launch dates, as well as risks associated with preclinical and clinical data (including the data discussed in this release), including the possibility of unfavorable new preclinical, clinical or safety data and further analyses of existing preclinical, clinical or safety data, including the risk that final results from EPIC-SR could differ from the interim data; the ability to produce comparable clinical or other results including efficacy, safety and tolerability profile observed to date, in additional studies or in larger, more diverse populations following commercialization; the risk that preclinical and clinical trial data are subject to differing interpretations and assessments, including during the peer review/publication process, in the scientific community generally, and by regulatory authorities; whether regulatory authorities will be satisfied with the design of and results from these and any future preclinical and clinical studies; whether and when any drug applications or submissions to request emergency use or conditional marketing authorization for any potential indications for PAXLOVID may be filed in particular jurisdictions and if obtained, whether or when such emergency use authorization or licenses will expire or terminate; whether and when regulatory authorities in any jurisdictions may approve any such applications or submissions for PAXLOVID (including the submission for conditional marketing authorization in the EU, the submission for EUA pending with the FDA and rolling submissions in other jurisdictions), which will depend on myriad factors, including making a determination as to whether the product’s benefits outweigh its known risks and determination of the product’s efficacy and, if approved, whether it will be commercially successful; decisions by regulatory authorities impacting labeling or marketing, manufacturing processes, safety and/or other matters that could affect the availability or commercial potential of PAXLOVID, including development of products or therapies by other companies; risks related to the availability of raw materials for PAXLOVID; the risk that we may not be able to create or scale up manufacturing capacity on a timely basis or maintain access to logistics or supply channels commensurate with global demand, which would negatively impact our ability to supply the estimated numbers of courses of PAXLOVID within the projected time periods; whether and when additional purchase agreements will be reached; the risk that demand for any products may be reduced or no longer exist; uncertainties regarding the impact of COVID-19 on Pfizer’s business, operations and financial results; and competitive developments.
A further description of risks and uncertainties can be found in Pfizer’s Annual Report on Form 10-K for the fiscal year ended
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