An over-the-counter (OTC) medication does not require a prescription. Examples include aspirin and cough medication, as well as vitamin and herbal supplements.
OTC drugs can sometimes cause side effects or serious problems if taken with prescription medications. Before taking any OTC medication, look for safety warnings on both the OTC package label and in the information that comes with your prescription medication.
Always check with your doctor or pharmacist if you’re not sure about using an OTC medication.