v. 25B6; verb
new measures to counteract drug trafficking : PREVENT, thwart, frustrate, foil, impede, curb, hinder, hamper, check, put a stop/end to, defeat.
a drug to counteract the possible effect on her heart : OFFSET, counterbalance, balance (out), cancel out, even out, counterpoise, countervail, compensate for, make up for, remedy; neutralize, nullify, negate, invalidate.
encourage, exacerbate.