A nurse is teaching a group of clients about ways to prevent sexual transmission of human papillomavirus. Which of the following information should the nurse include?

Rationale:
A. "Avoid consuming grapefruit juice while taking this medication.": Grapefruit juice inhibits the cytochrome P450 enzyme system in the liver, leading to increased serum levels of nifedipine. This can potentiate adverse effects such as hypotension, dizziness, and tachycardia.

B. "Your magnesium level will be monitored while taking this medication.": Nifedipine, a calcium channel blocker, does not significantly affect magnesium levels. Monitoring magnesium is more relevant for clients receiving magnesium sulfate.

C. "This medication can cause changes in thyroid function.": Nifedipine has no known effects on thyroid hormones or gland function. Drugs affecting thyroid function include amiodarone or lithium, not calcium channel blockers like nifedipine.

D. "This medication can cause an increase in blood glucose levels.": Nifedipine does not alter glucose metabolism. Medications such as corticosteroids and thiazide diuretics are more likely to cause hyperglycemia, whereas nifedipine’s primary effects involve smooth muscle relaxation and vasodilation.

Rationale for Correct Choices

• A change in mood: Isotretinoin can cause psychiatric adverse effects, including depression and suicidal ideation. Adolescents are particularly at risk, so any mood changes must be reported immediately to the provider for timely intervention and possible medication adjustment.

• Engagement in sexual activity: Isotretinoin is highly teratogenic, and pregnancy must be strictly avoided during therapy. Adolescents must notify the provider immediately if they engage in sexual activity, so proper pregnancy prevention measures and monitoring can be implemented.

Rationale for Incorrect Choices

• Dry mouth: While common with isotretinoin therapy, dry mouth is generally mild and manageable with hydration; it does not require immediate notification to the provider.

• The development of dry eyes: This is a known side effect of isotretinoin, often treated with lubricating drops. It is uncomfortable but not an urgent adverse effect requiring immediate reporting.

• Nausea: Mild gastrointestinal upset may occur but is typically self-limiting and does not necessitate urgent notification unless severe or persistent.

• Worsening of acne: Acne flare-ups can occur at the beginning of isotretinoin therapy but are expected and not considered an emergency; ongoing follow-up is sufficient.

• Sunburn: Increased photosensitivity is a known side effect. While the adolescent should take precautions, sunburn does not require immediate notification unless severe.

• Decreased night vision: Rare and usually reversible; it should be monitored but is not an immediate emergency unless it significantly impairs function.