Grandma (not Satan) is taking prostate medicine.
No, she does not have a prostate.
My mom saw it in her medication pile and freaked out. My grandma doesn't even know why she's taking it - just that her doctor prescribed it. So my mom took it to the pharmacy to ask if there was any possible reason why an 86yo woman would need to take prostate medicine. The pharmacist didn't have any idea.
So there you have it. Grandma has double vision, a stubborn streak, and an enlarged prostate.