delivered prior to the onset of a disorder, these interventions are intended to prevent or reduce the risk of developing a problem, such as underage alcohol use, prescription drug misuse and abuse, and illicit drug and enuse
any medical service that defends against health emergencies
includes doctor visits, such as annual physicals, well-woman appointments, and dental cleanings
some medicines are preventive, such as immunizations, contraception, and allergy medications
screenings, such as tests for skin cancer, high cholesterol, and colonoscopies, are effective preventive measures