According to regulations, which of the following does NOT require a child-resistant container when requested?

Sublingual nitroglycerin is the correct answer because it is specifically exempt from the requirement for child-resistant containers as outlined in regulations. The rationale behind this exemption is that nitroglycerin is often prescribed for individuals with certain cardiovascular conditions who may require quick access to their medication in emergencies. The ease of access is crucial for these patients, and it is recognized that child-resistant packaging could impede timely administration of the drug when needed.

In contrast, prescription painkillers, over-the-counter cold medications, and oral contraceptives are all typically required to be dispensed in child-resistant packaging due to safety concerns related to accidental ingestion by children. These medications can have serious consequences if ingested by someone other than the intended user, making the protective measures offered by child-resistant containers essential in those cases.