This allows the smooth muscles in the penis to relax and fill with blood. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow. It’s available in 50 mg, mg, and mg tablets. ED medications can cause side effects, and it’s crucial to have access to a medical provider if needed. For more information, work with a member of our medical team who can order lab tests to look for any critical underlying problems. 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 take.In addition to Viagra, REX MD also offers brand-name Cialis and generic Cialis (tadalafil). Both Viagra and sildenafil are available in mg, mg, and mg doses. REX MD . Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation prices vary based on the prescriber; $5 generic prescriptions Medical . How are Cialis and Viagra different? Cialis (tadalafil) and Viagra (sildenafil) are both used for erectile dysfunction, but there are a couple of distinctions between the two. .