What is a common auxiliary label that might be required for liquid medications?

The auxiliary label "Shake well" is commonly required for liquid medications, particularly those that are suspensions. These medications often contain particles that may settle at the bottom of the container. Shaking the bottle ensures a uniform mixture of the active ingredients and any excipients throughout the liquid before dosing. This is crucial for ensuring that patients receive the correct dose of the active medication, as the concentration of the drug can vary significantly if the suspension is not mixed properly.

While the other labels serve important purposes, they are not universally applicable across all liquid medications. "Take with plenty of water" may apply to specific medications but is not a general requirement for all liquids. "Keep away from sunlight" is relevant for certain light-sensitive drugs but not all. "Store in a refrigerator" applies to some medications that require cold storage, but again, it is not universally necessary for all liquid formulations. Therefore, "Shake well" stands out as a broadly applicable instruction for many liquid medications.