Which client should the nurse prioritize for informing the provider when caring for several clients with fungal infections?

The client receiving amphotericin B with jaundice should be prioritized for informing the provider because jaundice indicates potential liver dysfunction or damage, which can be a serious complication when using antifungal agents like amphotericin B. This medication is known to have significant renal and hepatic toxicity, and the presence of jaundice signals that the client may be experiencing severe adverse effects. Timely communication with the provider regarding this client's status is critical to ensure appropriate monitoring and intervention, as any irregularities in liver function can lead to cumulative toxicities or require adjustments in treatment.

While a client with a tinea infection, one on oral antifungal treatment without improvement, and one reporting itching may also need attention, their situations do not present the same immediate risk to their well-being as jaundice does. Tinea infections generally do not pose an acute threat, and lack of improvement or itching, although concerning, typically does not indicate a life-threatening issue that necessitates urgent medical intervention like jaundice does in this context.