- 3.1.6 The effects of R935788 on the developing human fetus are unknown. For this reason, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control or abstinence) prior to study entry, for the duration of study participation, and for 1 month after discontinuation of the study. Women of child bearing potential must have a negative pregnancy test in order to be eligible. Should a participant or a participant's partner become pregnant or suspect she is pregnant while participating in this study, the participant should inform the Research Team immediately.