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To the Editor: I recently treated an Army Special Forces soldier who presented with a three-month history of purulent sinusitis that was not responding to self-medication. After much prodding, he related that he had been taking a combination of penicillin and sulfa antibiotics, which he had purchased without a prescription “in the fish medication aisle” of a local pet store. He went on to explain that this over-the-counter source of antibiotics is common knowledge among all branches of the American Special Forces community.Out of curiosity, I followed up on our conversation by visiting two pet superstores (both of which . . .