Why are certain medications for minor problems such as dandruff only available with a prescription?

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I’ve been having problems with dandruff for the past few weeks. After trying all of OTC shampoos without any results I went to the dermatologist. She prescribed a 2% ketoconazole shampoo (OTC is 1%) and it worked like magic. Why isn’t this medication available for everyone? Why do I have to go to a doctor to get it?

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