Is a blue diamond shaped pill without imprint generic viagra,is it effective as brand viagra?

I find that the generic brand without imprint is not quite as effective for me . I need two pills instead of just 1 to get the same results as the name brand 100mg viagra

"Currently, a generic form of Viagra is not available. The medication is manufactured by Pfizer and is currently protected by a patent that prevents any generic versions from being manufactured. The patent for Viagra expires in 2012. It is expected that once this occurs, several companies will start manufacturing a generic version of Viagra. Before then, be wary of any company claiming to have a generic version of this drug. It may not be what the company claims."

https://www.drugs.com/availability/generic-viagra.html

Take care,

maso.-