Final answer:
The Poison Prevention Packaging Act requires most medications to be packaged in child-resistant containers, but nitroglycerin sustained release capsules are exempt from this requirement.
Step-by-step explanation:
According to the Poison Prevention Packaging Act (PPPA), only certain medications are required to be packaged in child-resistant containers to prevent accidental ingestion by children. Nitroglycerin sustained release capsules are exempt from this requirement because nitroglycerin is used to treat certain heart conditions and its potential benefits outweigh the risk of accidental ingestion. The other options, potassium chloride, isosorbide, and cholestyramine powder, are not exempt and should be packaged in child-resistant containers.
Learn more about Poison Prevention Packaging Act