Instructing a client on the side effects of flagyl, which symptom requires monitoring?

Monitoring for red-brown urine is particularly important when a client is taking Flagyl (metronidazole) because this symptom can indicate a potentially serious condition related to medication use or a result of hemolysis. While some degree of discoloration may occur due to the drug itself, significant changes in urinary color warrant further investigation, as they can reflect underlying issues such as liver dysfunction or hemolytic anemia. Observing for this side effect helps ensure that any serious complications are identified and addressed promptly.

Other side effects like headache, dizziness, and metallic taste, although uncomfortable for the patient, do not typically signify a need for immediate medical intervention or extensive monitoring compared to red-brown urine.