The Food and Drug Administration approved Rx-to-OTC switches in 1975. Since then, 102 formulas have been approved for general sale. The drugs treat some of the most common ailments and conditions: allergies, indigestion, constipation and insomnia. Today, it's hard to imagine that a prescription was once required for hydrocortisone or ibuprofen. But a review of Rx-to-OTC medications approved over the years by federal regulators provides a telling glimpse of how far the industry has progressed ...

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