The FDA's Cutoff For Vaccine Effectiveness is 50%; Pfizer Is Now At 42%. Therefore, according to the FDA the Pfizer vaccine is not effective.

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"While both vaccines were highly protective against infection from January to July......their effectiveness estimates declined during the month of July, with an estimate of 76% for Moderna...... and 42% for Pfizer"

This is where you can see this statement: Pfizer and Moderna Go Head to Head Against Delta | MedPage Today

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"The FDA's cutoff for covid-19 vaccine effectiveness is 50%"

This is where you can see this statement: The FDA's cutoff for Covid-19 vaccine effectiveness is 50 percent. What does that mean? (nbcnews.com)

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The FDA's Cutoff For Vaccine Effectiveness is 50%; Pfizer Is Now At 42%. Therefore, according to the FDA the Pfizer vaccine is not effective.

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Keeping For Future Reference As Needed:

‍Coronavirus (COVID-19) Update: FDA Takes Action to Help Facilitate Timely Development of Safe, Effective COVID-19 Vaccines | FDA

Comparison of two highly-effective mRNA vaccines for COVID-19 during periods of Alpha and Delta variant prevalence | medRxiv