If you have an erection that lasts more than 4 hours, get medical help right away. Oral medicines for ED usually work well and cause few side effects. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the drug’s effects last and side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil Stendra. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help.Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you . VIAGRA can cause serious side effects. Rarely reported side effects include: By asking questions about ED, you can help your doctor get the information he or she needs to . The Savings Offer and Program expire on 12/31/ For further information, call , visit , or write: Viatris Inc., P.O. Box , Mission, KS .