When teaching a caregiver about phenytoin oral suspension, which storage instruction is correct?

The recommendation to store phenytoin oral suspension in a cool area is important for maintaining the medication's stability and effectiveness. High temperatures can lead to degradation of the drug, potentially making it less effective or even harmful. Storing it in a cool environment ensures that the medication retains its potency for its intended duration of use.

In contrast, phenytoin suspension should not be exposed to direct light, as this can affect its chemical stability, meaning that keeping it in a well-lit area may not be appropriate. Similarly, while it's essential to protect medications from damp environments, the specific guidance for this medication highlights the importance of cool storage rather than just avoiding moisture. Additionally, refrigerating after opening could be contraindicated as many formulations of phenytoin are not required to be refrigerated, so this option does not apply unless specified in product guidelines. Thus, storage in a cool area is the best practice for ensuring effective and safe use of the medication.