Certified Paraoptometric (CPO) Practice Exam 2025

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What is the onset time for Phenylephrine?

10-20 minutes
20-30 minutes
30-60 minutes
60-90 minutes

The correct answer is: 30-60 minutes

Phenylephrine is a selective alpha-1 adrenergic agonist commonly used as a mydriatic agent to dilate the pupil. The onset time for Phenylephrine is typically around 10 to 20 minutes following administration, especially when used in an eye care setting for dilation purposes. This relatively quick onset allows for effective and timely pupil dilation during procedures such as eye examinations or surgeries. The option selected, which indicates a longer time frame, does not accurately reflect the rapid action of Phenylephrine when used for this specific application. However, it is noteworthy that the extent of dilation might vary based on individual responses and the concentration of the solution used.