What’s the best treatment? Its effects might last longer if you have mild to moderate ED. People with heart conditions should never take ED medications without consulting a doctor. The dosages might also be unknown, or they might have been contaminated during formulation. It’s available in 50 mg, mg, and mg tablets.Updated on June 23, You’ve likely heard of some medications for ED (erectile dysfunction) before, but there are many types, and they work in different ways. If one . Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that . 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 .