Because if you use this over-the-counter drug in the United States, you must show photo identification for purchase.

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"The Herzog purchase greatly increased the number of Nasdaq and over-the-counter stocks Merrill Lynch makes markets in, " says a company spokesman.

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For the New York stores a buyer arrives at the city's famous Fulton Fish Market every morning at 2 a.m. to purchase the fresh catch of the day, which is then highlighted at the counter.

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