If you are:
Not Recommended: RISK OF ABORTION DURING 1ST TRIMESTER;MALFORMATION RISK NOT ACCURATELY KNOWN.
Precaution: POTENTIAL FOR SERIOUS ADVERSE EFFECTS ON INFANT
An adult over 60:
management or monitoring precaution: Renal-Reduce dose for CrCL<50 to minimize the higher risk for immunosuppression.
Giving mercaptopurine to a child under 12:
Severe Precaution: Reports of symptomatic hypoglycemia age < 6 years.