Because of the vowels between the words. In Englsih we can't handle vowel clusters and as anti-inflammatory ends the first word in i and starts the second in i we wouldn't be able to pronuonce it as a single word.
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studentmdlwhy there is dash for anti-inflammatory?? and why not for antibiotic?Do use a hyphen with prefixes ending in a or i and a base word beginning with the same letter. Example - anti-inflammatory.