Synribo subcutaneous precautions What should I know regarding pregnancy, nursing and administering Synribo subcutaneous to children or the elderly?If you are: Pregnant: Not Recommended: INSUFF HUMAN DATA; POTENTIAL FOR FETAL HARM; FETOTOXIC IN MICE AT HALF MRHD. Nursing: Precaution: INSUFFICIENT HUMAN DATA AVAILABLE An adult over 60: Precaution: INCR. HEMATOLOGIC AES. LOWER RATES OF MAJOR CYTOGENETIC RESPONSES. Giving Synribo subcutaneous to a child under 12: Warning: NO SAFETY AND EFFICACY ESTABLISHED.