Coca, whether in the meaning of cocaine or of Coca-Cola, is definitely an anachronism. Peru had just barely been conquered by the Spanish at the time when Shakespeare was writing the play, and it is very, very unlikely that he had any knowledge of the drug whatsoever. In any case, unprocessed coca leaf is quite harmless, and refined cocaine did not exist until the 19th century. The effects of cocaine are stimulant rather than soporific. So there is no way this could have been either Juliet's knockout drops or Romeo's lethal poison.
I think we may possibly have a rather cryptic cross-reference to drug use here, assuming you guys are transcribing this correctly.
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