Usage History of 'fentanyl'

The following chart shows how frequently 'fentanyl' appeared in printed materials over time. For example, the word 'fentanyl' occurred 2 times in books in 1886 and 16,984 times in 2008. From 1886 to 2008, the word 'fentanyl' was used a total of 337,465 times in books scanned by Google. See Reference: Google Ngram project.

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