preventive

/prɪˈvɛntɪv/
adjective
  1. Intended to stop something undesirable from happening, especially illness or damage.
    • Getting a flu shot is a common preventive measure during the winter months.
    • The car's preventive maintenance schedule includes regular oil changes and tire checks.
    • Many companies offer preventive health screenings to their employees.
Antonyms
noun
  1. Something that stops or hinders something undesirable, especially a medicine or treatment that prevents disease.
    • Taking vitamin C is sometimes used as a preventive for the common cold.
    • Vaccines are one of the most effective preventives against infectious diseases.
    • The doctor recommended a daily aspirin as a preventive against heart attacks.