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Which dosage form is to be shaken well prior to administration?

A otic suspension

Suspensions must be shaken well prior to administration to disperse the drug particles that are suspended in another liquid. Not sufficiently agitating a suspension prior to administration can lead the patient to not get the full and intended dose. A paste, solution, and insulin would not require shaking per se; however, the insulin vial should be rolled (not shaken) prior to use.