Pfizer-BioNTech COVID-19 vaccine demonstrated its efficacy and safety in several stages of clinical trials before been authorized for emergency use, and therefore isn’t experimental
In August 2021, the U.S. Food and Drug Administration granted full approval to the Pfizer-BioNTech COVID-19 vaccine for people 16 and older. Before receiving the Emergency Use Authorization in December 2020, the vaccine already had to demonstrate that it was safe and effective against the disease by completing several stages of clinical trials. Still, safety monitoring of vaccinated populations and trial participants continues as a standard procedure to collect more data about the vaccine performance in real-world conditions.