Final answer:
An absolute contraindication for using vasoconstrictors is having had a myocardial infarction (MI) episode within the past 6 years.
Step-by-step explanation:
An absolute contraindication for using vasoconstrictors is having had a myocardial infarction (MI) episode within the past 6 years. This means that if a person has experienced a heart attack within the past 6 years, they should not use vasoconstrictors. Vasoconstrictors are substances that constrict blood vessels, and using them in someone who has had a recent heart attack can potentially worsen their condition.