Can I take Thioguanine when pregnant or breastfeeding?
Thioguanine is classed as Pregnancy Category D by the FDA, which means it can potentially harm an unborn baby. Inform your doctor immediately if you are pregnant or become pregnant during treatment with Thioguanine. Also use an adequate form of contraception while using Thioguanine.
It is not yet known if Thioguanine passes into breast milk. Talk to your doctor before breast feeding when you are using Thioguanine.