Any reputable pharmacy in Bangkok, even in patpong, will have legit stuff. You can tell a proper pharmacy when you see one.. just don't walk into the first dinky hole in the wall you see.. I've had success there before, never got fake stuff, NEVER...yet... as for price issues, that depends on your bargaining skills. The only reason I suggested patpong was because of the convenience issue. but yes, it is a tourist trap none-the-less
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