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Use "preventatives" in a sentence
"Fortunately for Mrs. Wettin, the present governmental figure-head, jolly old Liz either availed herself of some of the "preventatives" so extensively advertised in "great family newspapers," or neglected to own her illegitimate offspring."
"Don't mess around with fleas, a 6 dollar pill from your vet kills all the fleas on your pet in a few minutes and monthly flea preventatives are recommended after that."
"These drugs aren't used as preventatives, but rather you take them when you feel an attack coming on."