Insurance can help you save even more on consultations and medications. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Its effects might last longer if you have mild to moderate ED. Kidney disease that needs to be treated with dialysis. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. They include dutasteride Avodart, Jalyn and finasteride Propecia, Proscar.Viagra can help you have an erection when sexual stimulation occurs. An erection will not occur just by taking a pill. (FDA), but it is sometimes prescribed to women off-label, . In most males,* Viagra works within 1 hour after it’s taken. It’s possible that Viagra can begin working within 30 minutes of being taken. But other times, it may take up to 4 . FAQs Takeaway We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process. How .