There are currently only three oral treatments that are known to be effective in correcting erectile dysfuntion, and these cannot be guaranteed to work in every case, although their success rate is generally extremely high.  The first of these is Viagra (sildenafil citrate)  which is produced by Pfizer and was the first on the market and is still the biggest seller world wide.  The next in the market volume -wise is Cialis (tadalafil) from Eli Lilly, which has gained a reputation as "the weekend pill" because of the extended period it has been found to be effective for some users.  Finally there is Levitra (vardenafil) from Bayer which is gaining market share and loyal users.  Apart from these products there are hundreds, possibly thousands of products that claim to be the answer to impotence.  If any of these were effective in any other way than via a placebo effect, then one of the world dominating pharmaceutical giants would have the rights to manufacture and market.  The fact that they don't tells us all something.  The sellers of these "iffy" products are playing on human gullability.  They may even be dangerous or lethal.  Some that do work are illegal doses of  the prescription drugs already mentioned but sold illegally by unscrupulous people with no regard for others well being and a greed that knows no bounds or moral limits.  When there is a new tried, tested and approved drug for erectile dysfunction, Clinic Europe will make sure that it is available to those who wish to try it by the correct and safe route of consultation and prescription from a properly qualified and registered doctor.  Be careful - people die from taking unlicensed drugs.