For a patient experiencing side effects from the use of oxybutynin, which symptom indicates a need for medical attention?

Oxybutynin is an anticholinergic medication commonly used to manage overactive bladder symptoms. While this medication can cause several side effects due to its anticholinergic properties, blurred vision stands out as a symptom that may indicate a more serious issue requiring medical attention.

Blurred vision can result from increased eye pressure, which might be linked to narrow-angle glaucoma, a condition that can be exacerbated by anticholinergic medications. This potential side effect is significant because it can lead to more severe vision problems and requires immediate evaluation and intervention by a healthcare professional.

In contrast, symptoms like weight loss, dry mouth, and headache are more common and typically considered manageable side effects of oxybutynin. While they should be monitored, they do not carry the same potential for serious complications as blurred vision does. Therefore, blurred vision is the symptom that warrants prompt medical attention when associated with oxybutynin use.