What are over-the-counter (OTC) medicines?
Over-the-counter (OTC) medicines are those that can be sold directly to people without a prescription. OTC medicines treat a variety of illnesses and their symptoms including pain, coughs and colds, diarrhea, constipation, acne, and others. Some OTC medicines have active ingredients with the potential for misuse at higher-than-recommended dosages.
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Source: National Institute on Drug Abuse; National Institutes of Health; U.S. Department of Health and Human Services.