What precaution is recommended when exercising while taking niacin?

What precaution is recommended when exercising while taking niacin?

• A. Monitor for flushing or hypotension; avoid strenuous exercise during peak vasodilation.
• B. Avoid hydration during exercise.
• C. Increase caloric intake prior to exercise.
• D. Exercise is contraindicated with niacin.

Answer: (A)

Niacin can cause vasodilation in the skin, leading to flushing and sometimes a drop in blood pressure. When you exercise, blood flow shifts toward the muscles, which can amplify these effects and raise the risk of dizziness or fainting during peak vasodilation. The safest precaution is to monitor for flushing or hypotension and avoid strenuous exercise during the period when vasodilation is at its peak after taking niacin. Hydration remains important, and you can usually continue activity at a comfortable pace once the flushing subsides. The other options don’t address the safety concern specific to niacin — hydration isn’t forbidden, changes in calories aren’t the relevant precaution, and exercise isn’t inherently contraindicated—just more cautious during peak vasodilation.

Niacin can cause vasodilation in the skin, leading to flushing and sometimes a drop in blood pressure. When you exercise, blood flow shifts toward the muscles, which can amplify these effects and raise the risk of dizziness or fainting during peak vasodilation. The safest precaution is to monitor for flushing or hypotension and avoid strenuous exercise during the period when vasodilation is at its peak after taking niacin. Hydration remains important, and you can usually continue activity at a comfortable pace once the flushing subsides. The other options don’t address the safety concern specific to niacin — hydration isn’t forbidden, changes in calories aren’t the relevant precaution, and exercise isn’t inherently contraindicated—just more cautious during peak vasodilation.