To suggest that a particular medical treatment or action should NOT be used due to circumstances that make it unsuitable or dangerous.
From counter- (opposite) + indicate (from Latin 'indicare,' meaning to point out). A medical term where a symptom or condition 'points against' a treatment.
If a patient has a penicillin allergy, that counterindicates prescribing penicillin—doctors must always check for counterindications before recommending any treatment!
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