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Sinus, cold, and allergy remedies comprise the most widely used sector of the over‐the‐counter (OTC) drug market. Direct‐to‐consumer advertising (DTCA) of pharmaceutical products has increased over the past 30 years, including the promotion of OTC drugs. The influence of DTCA on OTC sinonasal remedies comprises several positive and negative effects. Favorable aspects of this influence include empowerment...
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