Desuden anbefales det at søge råd med hensyn til kryokonservering af sædvæske før behandling på grund af muligheden for irreversibel infertilitet efter behandling med TMZ.
Therefore, men being treated with it should be advised not to father a child up to 6 months after receiving the last dose and to seek advice on cryoconservation of sperm prior to treatment, because of the possibility of irreversible infertility due to therapy with TMZ.