In cases where a patient is suffering from diabetics or is a smoker, it is likely to show delays in results and one may have to wait for a period of up to two weeks. Nevertheless, one of them happens to be Sildenafil
. I protested politely, as is the custom in China, but I accepted it when he whispered it was one of his company's sexual health products. LONDON, Nov 28 (Reuters) - Pfizer’s blockbuster erectile dysfunction drug Viagra has been given a green light for sale without a prescription in Britain, the first country to grant it over-the-counter status.