- The effects of BCNU (the active ingredient in the Gliadel wafer) with concomitant Temozolomide on the developing human fetus are unknown. BCNU is known to cause fetal harm if administered to a pregnant woman and is a pregnancy risk factor D. Temozolomide May cause fetal harm when administered to pregnant women. Animal studies, at doses less than used in humans, resulted in numerous birth defects. Testicular toxicity was demonstrated in animal studies using smaller doses than recommended for cancer treatment. Temozolomide is also a pregnancy risk factor D. Radiation therapy is known to be both mutagenic and teratogenic. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study, or if her partner is participating in this trial, she should inform the treating physician immediately.