Oral phentolamine mesylate 40 mg (brand names Vasomax, Vigamed, Vasoviril) is an excellent ED treatment that deserves more love.
Phentolamine is not Viagra, it is an alpha blocker that works by stopping sympathetic action in the penis thus improving blood flow and erections.
Unfortunately, oral phentolamine is not FDA approved in the United States but it is available in several countries (e.g. Mexico, Brazil, China).
I have used it for many years with excellent results but I had to stop because I couldn't find any more suppliers. I used to buy it from Buy Bimatoprost | Buy generic Bimatoprost | Order Bimatoprost | online Bimatoprost | Latisse Applicator Brush Refills (http://www.worldwide-pharmacies.com) but now they're out of stock.
You can easily buy oral phentolamine in China but shipping to your country may be difficult. In this case, I suggest looking for a good Chinese forwarder at Parcl - First Worldwide Shipping Community (http://www.parcl.com)
Alibaba.com is another option: you can order phentolamine capsules from a Chinese company called Shaanxi Virgin Element Biotech Co., Ltd: https://virginelement.en.alibaba.com/?spm=a2756.trade-order-list.0.0.b91276e9QifOMW&tracelog=from_orderlist_company
There are several studies that show oral phentolamine's efficacy and safety:
https://www.ncbi.nlm.nih.gov/pubmed/12152116
And an excellent YouTube video on phentolamine:
https://www.youtube.com/watch?v=uKjCqXS96eg
If you know any other suppliers of phentolamine that ship to Europe, please let me know.