Question

which of the following describes the primary purpose of the durham - humphrey amendment of 1951? to distinguish between prescription and over - the - counter (otc) medications to require manufacturers to supply proof of a medications effectiveness to classify the five levels of controlled substances to require childproof packaging on all medications

Explanation:

The Durham - Humphrey Amendment of 1951 was mainly to distinguish between prescription and over - the - counter (OTC) medications. Before this amendment, there was no clear distinction. This amendment set the regulatory framework for which medications required a doctor's prescription and which could be sold directly to consumers without one.

Answer:

To distinguish between prescription and over - the - counter (OTC) medications