It is true that there is no such thing as generic Viagra. The generic product is Sildenafil Citrate - this is the name. Most 'reputable' suppliers of Sildenafil Citrate are very careful about the terminology used as Viagra is a registered trademark and thus can not be a 'generic' product. RX-Mex, do not sell counterfeit Viagra. They sell Sildenafil Citrate and genuine, branded Viagra. Buyers have a choice. Not many on-line pharmacies offer such an option!!!
Most of the generic products are sourced in India as the legal situation in respect of patenting is somewhat different to the American model. (Not better, or worse, but different). All depend on market. This means that many drug companies are able to manufacture, perfectly legally and to normal quality standards, drugs which are then sold in India and around the world. Indeed, in the US, most health insurers actively encourage prescribers to write up generics whenever possible, to save money. This is true in most of the western world. The brand of Sildenafil Citrate supplied to me was Zenegra, manufactured in India by Alkem Laboratories Ltd, one of the largest pharmaceutical manufacturers in India and a firm who are now setting up manufacture in the USA. http://www.alkemlabs.com/ I am aware of the white tablet, it is clearly noted on the Rx-Mex.com website, but I do not know its brand.
As to the safety, or otherwise of generic pharmaceuticals, if they are produced correctly there is no medical difference between a generic and branded product. Your body can not tell the difference between a drug produced in one manner, or another. It only metabolises the active chemicals that it is given. There are many suppliers of pharmaceuticals that I would not go near, simply because of the manner in which they promote themselves, or describe their products. One of the problems of buying on-line is that it can be difficult to ascertain the provenance of a product. Phizer is very keen to stamp out the trade in falsely labeled Viagra and so they should be. We too should be glad. I am happy to buy Sildenafil Citrate, I am much less happy to buy a pill that is false labeled as Viagra, I am sure you can understand why, and why there is a difference.
Phizer and other producers of branded medication have a huge and justified interest in protecting their brand name and product, that they use FUD (fear, uncertainty and doubt) to keep people buying their branded product is normal. It is also normal that they tell you the story that best suits their purpose.