the.com/contraindication

The fine print that stops your cure from becoming your cause of death.

means A specific reason — a condition, drug, or circumstance — that makes a particular treatment or procedure risky or unwise to use.

from Built from the Latin prefix 'contra-' (against) plus 'indication' (from indicare, to point out or show). So literally it means 'a pointing-against' — the medical evidence pointing the opposite direction from the treatment you were about to give. The word entered medical Latin and English usage as doctors needed a precise term for 'yes, this drug normally helps, but not here, not for this patient.'

literal meaning
a reason not to, hiding inside the reason to
common example
grapefruit juice sabotages dozens of common medications
ignored at parties
alcohol plus almost anything is one
root word
latin contra, against the thing you wanted
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