Endpoints News first reported Prasad's departure.
His exit comes after a number of unusual regulatory actions, including those taken recently by the agency on Sarepta Therapeutics' gene therapy, Elevidys.
"Unprecedentedly, there were multiple press leaks from the FDA, negatively impacting (its) credibility," said BMO Capital Markets analyst, Koustas Billouri.
During Prasad's short stint, the U.S. FDA limited the use of COVID-19 vaccines and declined to approve therapies from Replimmune and Capricor Therapeutics.
The regulator's decisions under Prasad raised concerns that he was anti-patient choice, Jefferies analyst Roger Song said, adding that investors will see his departure as a positive for gene therapy and vaccine makers.
Prasad also held the additional role of the agency's chief medical and science officer, to which he was appointed last month, according to STAT News.
Nominating a more seasoned official to replace him could help the FDA rebuild its credibility, BMO's Billouri said.
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