It’s available in 50 mg, mg, and mg tablets. You can take this medicine with or without food 30 minutes before sex, depending on the dose. Its effects might last longer if you have mild to moderate ED. This allows the smooth muscles in the penis to relax and fill with blood. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. 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.Luckily, there are effective alternatives to Viagra that are doctor-approved. Continue reading to learn about other ED drugs as well as some alternative methods of . Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult . Is there an over-the-counter version of Viagra? Can I get Viagra online without seeing a doctor? Currently, there are no over the counter alternatives to .