A female client starts a new prescription, oxybutynin, for symptoms of an overactive bladder. The client tells the nurse that she is training to run in a half-marathon. Which instruction should the nurse emphasize?

A. Wear padding to protect from bruising if a fall occurs: While safety precautions are important for any physical activity, the specific concern with oxybutynin is not related to a higher risk of falls or bruising. The primary issue is managing side effects that might affect hydration and body temperature. B. Take measures to avoid dehydration and over-heating: Oxybutynin can cause dry mouth and decreased sweating, which can increase the risk of dehydration and overheating, especially during intense physical activities like running. Emphasizing hydration and measures to avoid overheating is crucial to prevent complications. C. Avoid crowds to help prevent acquiring infections: Oxybutynin does not typically affect the immune system or increase the risk of infections. The client’s concern should focus on managing side effects related to exercise and hydration, rather than avoiding crowds. D. Keep skin and eyes covered to protect from sun injury: Oxybutynin does not have a direct effect on sun sensitivity or increase the risk of sunburn. While sun protection is generally important for outdoor activities, it is not a specific concern related to the use of oxybutynin.