If you are:
FDB Contraindicated or Not Recommended: FDA C; TERATOGENIC IN ANIMALS, POTENTIAL FOR SERIOUS ADVERSE EVENTS
Absolute Contraindication: SERIOUS ADVERSE EFFECTS POSSIBLE; EXCRETED IN RATS
Giving Gilenya to a child under 12:
Severe Precaution: Potential risk of developmental delay, reduced bone mineral density, neuro-behavioral impairment Risk of bradycardia, AV block. Safety and efficacy not established.