Usage History of 'phenmetrazine'

The following chart shows how frequently 'phenmetrazine' appeared in printed materials over time. For example, the word 'phenmetrazine' occurred 4 times in books in 1936 and 217 times in 2008. From 1936 to 2008, the word 'phenmetrazine' was used a total of 20,860 times in books scanned by Google. See Reference: Google Ngram project.

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