Whither Viagra? The Margin hears a Swedish-made fizzy drink, Niagra, is giving, eh, a lift to the love lives of folk in the American south. The herbal tonic made by Nordic Drinks bombed in Europe, but its potent erotic qualities have ensured success in the libidinous land across the sea. Any such product seems destined for success these heady days. Yet whether Viagra falls because of Niagra remains to be seen.