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Well if you really need a blue pill then try and buy them over there, unless you look like a dodgey character you shouldn't have a problem with customs.
Get a vitamin/calcium tablet bottle from Tesco/Boots ( for about 30p each last I checked). Toss out its contents and load them with the blue pills. Carry them in your hand luggage/checked luggage. Never faced any issues with any pills at either UK or German border.
Why not just take the Viagra in the proper packaging? It's not illegal, and at least you are not being deceptive - storing Viagra in vitamin tablet jars would raise suspicions at Border Control, in my view. Best to be honest in this case.