Oral medicines for ED usually work well and cause few side effects. Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. Insurance can help you save even more on consultations and medications. If approved, the provider will issue a prescription. However, some states require a live video consultation. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.These medicines all work well for ED. When choosing one, tell your doctor or other health care professional what your preferences are, such as cost, ease of use, how long the . Vision changes. Muscle pain. But there are some differences. With Viagra, there is a higher risk of vision changes than with Cialis. Among people who take Viagra or sildenafil, 3% . If someone experiences difficulty having an erection, many of these products (despite their spectacular claims) are rarely effective, particularly when a more direct and .