What precautions must be taken when storing controlled substances in a pharmacy?

The correct choice emphasizes the importance of security and restricted access when storing controlled substances in a pharmacy. Controlled substances are drugs that have a high potential for abuse and can lead to severe psychological or physical dependence. Due to their nature, it is crucial to limit access to these substances to only those healthcare professionals who have the authority and training to handle them safely.

By requiring that these substances be securely locked and accessible only to authorized personnel, pharmacies can prevent theft, misuse, and accidental access by those who are not qualified to handle them. This practice is not only a legal requirement in many jurisdictions but also an ethical obligation to protect public health and safety.

The other options suggest practices that could compromise the security of controlled substances. For example, making them accessible to all staff could lead to unauthorized access, while storing them in semi-volatile environments or on open shelves would further increase the risk of theft and misuse. Proper storage protocols are essential for maintaining the integrity of controlled substances and ensuring that they are used appropriately.