A 65-year-old female has a history of hypertension, hyperlipidemia, and episodic migraines. Her blood pressure is chronically elevated and she is non-compliant with her antihypertensive therapy. She had a cerebral infarct 5 years ago, from which she recovered fully, with no residual deficits. She is asking for a prescription of an injectable sumatriptan for her severe migraines. What is the most appropriate response to her request?