If my boyfriends taking medication that would effect my Nexplanon implant could it spread to me through his sperm? In other words is it safe to have sex if he's on medication that would effect the implant if I was taking it? He is taking Bactrim DS (smp-tmz) it's an antibiotic. I was reading and it says that Bactrim would effect the implant if I was taking it. But he is... So am I okay?