Which of the following must OTC drug labeling include?

The requirement for OTC (over-the-counter) drug labeling to include the name of the manufacturer is essential for several reasons. First, it provides consumers with transparency about who is responsible for the product. This is particularly important in case a consumer wishes to report an adverse event or seek information about the drug. Including the manufacturer's name helps to enhance accountability and trust in the product being marketed.

Additionally, proper labeling helps regulatory bodies ensure that the medications are produced and marketed by reputable companies, which contributes to consumer safety. The manufacturer’s information allows healthcare professionals and consumers alike to verify the legitimacy and quality of the product.

Other options, while they may contain useful information, do not encompass all the required elements of OTC drug labeling. For instance, while active ingredients and potential side effects are indeed critical parts of labeling, the requirement for the manufacturer's name ensures that essential information regarding the identity and responsibility of the product's producer is explicitly conveyed.