Which symptom is a known adverse effect that should be monitored when using nystatin?

The choice indicating that "No routine tests recommended" is the correct answer highlights an important aspect of nystatin use. Nystatin is an antifungal medication commonly used to treat infections caused by Candida species. One of the key points to understand about nystatin is that it is generally considered safe and well-tolerated, especially when taken orally or used topically, and it does not typically require routine monitoring of laboratory tests.

While nausea, fever, and electrolyte imbalances can be important concerns with many medications, they are not primary concerns associated with nystatin use. Nystatin is not known to cause significant systemic absorption, especially in the doses typically used for oral thrush or superficial skin infections; therefore, the risk of severe side effects that would warrant routine monitoring is low. In practice, clinicians often do not need to perform regular tests as part of the treatment regimen with nystatin, making this choice accurate in that context.