GREENFIELD — The town is joining a class-action lawsuit against three major pharmaceutical companies in an attempt to recoup costs associated with a spike in drug overdoses in recent years, according to Mayor William Martin.

The lawsuit names three companies, identified as “the big three,” as defendants: McKesson Corp., Cardinal Health, and AmerisourceBergen.

The lawsuit was filed by Levin Papantonio of Pensacola, Florida, and the Sweeney Merrigan Law firm, which has offices in Boston and Greenfield.

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