by Anntoin » Mon Mar 23, 2015 6:53 pm
A drug contraindication spells out under what conditions the drug should not be used(e.g. contraindicated during pregnancy, or if simultaneously taking drug X)
A precaution is similar, but is usually used as a warning of the potential effects of the drug being taken(e.g. do not drive following taking).
I hope this helps,
Mike