Contraindication is the usual term for that.
If by "funny" you mean unusual or abnormal, the term you are looking for may be "paraesthesia."
sickle-cell disease
An idiosyncratic reaction is a response or susceptibility to a drug that is peculiar to an individual.
Unusual or abnormal
Not normal, unusual, strange, out of the ordinary.
Abnormal, Uncommon
Abnormal
The antonym of usual is unusual.
Not normal, unusual, strange, out of the ordinary.
odd, abnormal, unusual, ugly
Atypical, abnormal, unusual, irregular, uncommon...
weird, strange, abnormal, unusual