A nurse in a provider's office is collecting data from a client who continues to have a migraine headache after taking sumatriptan orally 2 hr ago. Which of the following findings is the priority for the nurse to report?

A. Tingling sensation. A mild tingling or paresthesia is a common side effect of sumatriptan due to its vasoconstrictive action. While it should be monitored, it is not typically harmful and does not require immediate medical intervention. B. Hypertension. Sumatriptan works by constricting blood vessels to relieve migraine symptoms, but it can also cause a dangerous increase in blood pressure. Severe hypertension can lead to complications such as stroke or myocardial infarction. This is the priority finding that requires immediate reporting to prevent life-threatening cardiovascular events. C. Dizziness. Dizziness can occur due to sumatriptan’s vasoconstrictive properties or from the migraine itself. While it can be uncomfortable, it is not an immediate threat to the client’s safety unless it is severe or associated with other neurological symptoms. D. Flushing. Facial flushing is a known side effect of sumatriptan and is generally harmless. It occurs due to transient vasodilation in the skin and does not indicate a serious adverse reaction. Monitoring is appropriate, but it does not require urgent intervention.