contraindication
🇺🇸
/ˌkɑːntrəˌɪndɪˈkeɪʃn/
🇬🇧
/ˌkɒntrəˌɪndɪˈkeɪʃn/
A reason why a certain medicine or treatment should not be used by someone.
His allergy to penicillin was a contraindication for taking that antibiotic.