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Synonyms for Preventative (same or very similar meaning)

WordNet sense 1 (remedy that prevents or slows the course of an illness or disease):
preventive, prophylactic

WordNet sense 2 (any obstruction that impedes or is burdensome):
encumbrance, hindrance, hitch, interference, incumbrance, hinderance

WordNet sense 3 (an agent or device intended to prevent conception):
contraceptive, contraceptive device, birth control device, prophylactic device

WordNet sense 4 (tending to deter):
deterrent

WordNet sense 5 (conducive to good health of body or mind):
healthful


From the ODE community, based on WordNetadd/edit