- Women of child-bearing potential must be taking adequate contraceptive precautions prior to study entry and for the duration of study participation. A negative serum or urine pregnancy test is required within 7-10 days of Tarceva® administration. Men and premenopausal women of child bearing potential will follow an approved, medically accepted birth control regimen or agree to abstain from heterosexual intercourse while taking study drug and for 30 days following the last dose of study drug.