I took my first dose this morning and so far I am quite impressed. I was able to achieve the same results as with Viagra, but there does not appear to be any side effects such as nasal congestion and heartburn. I was also able to achieve a second erection within 10 minutes. I will revise my review in a couple of days when I see how long the effects last. If it is at least 48 hours, I will be thoroughly impressed. As it is, I plan to purchase more and recommend this product to anyone with ED.