HESI Pharmacology Practice Exam Related

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The camp nurse asks the children preparing to swim in the lake if they have applied sunscreen. The nurse reminds the children that chemical sunscreens are most effective when applied:

  • A. Immediately before swimming
  • B. 15 minutes before exposure to the sun
  • C. Immediately before exposure to the sun
  • D. At least 30 minutes before exposure to the sun
Correct Answer: D

Rationale: Chemical sunscreens are most effective when applied at least 30 minutes before exposure to the sun to allow them to penetrate the skin and provide optimal protection. Applying sunscreen in advance ensures it has enough time to be absorbed and offer the intended protection. It is important to reapply sunscreen after swimming or sweating to maintain its effectiveness.