A soft drink containing an ingredient of the impotence drug Viagra has been banned by Japanese officials. The acted after advertisements for the drink, touted as "the solution to your night time problems", appeared in men's magazines and on the Internet. Some 47,000 bottles of the non-prescription drink were imported from China a year ago, and all but 4,000 had already been sold, mainly in pharmacies around Nagoya, western Japan, said a local government official there.