Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. Contact your medical provider if you experience any side effects during treatment. Your health and wellbeing come first. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. What Are the Symptoms of Erectile Dysfunction?Lemonaid can prescribe sildenafil (generic Viagra), tadalafil (generic Cialis), and vardenafil (generic Levitra). You can get a prescription online following a quick and easy visit with . AdSay Goodbye to Performance Anxiety and Hello to Improved Sexual Stamina! Trust Our Unbiased Reviews and Improve Your Sexual Health in Confidence!Honest & Unbiased Reviews · Over 20 Years Online · Over Products Tested. Viagra, Cialis, Levitra, and Stendra are oral medications used to treat erectile dysfunction (ED). You may also know them by their generic names: sildenafil .