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McLawhorn MW, Goulding MR, Gill RK, Michele TM. Analysis of benzonatate overdoses among adults and children from 1969-2010 by the United States Food and Drug Administration. Pharmacotherapy. January 2013, 33 (1): 38–43. PMID 23307543. S2CID 35165660. doi:10.1002/phar.1153.