Federal law prevents refills of this medication. your physician will give you a new prescription when you need more medicine.-rationale: federal law prevents the refill of opioids. therefore, the nurse should tell the client to contact the physician for a new prescription when the current prescription is empty. the client should be instructed to avoid driving or operating hazardous machinery while under the effects of morphine; however, this is a safety issue not a legal one. long-term morphine sulfate use may lead to drug tolerance; however, this isnt a legal issue surrounding its use. the client with metastatic cancer will most likely require pain medication for the rest of his life.client needs category: physiological integrityclient needs subcategory: reduction of risk potentialcognitive level: applicationreference: taylor, c., et al. fundamentals of nursing: the art and science of nursing care, 6th ed. philadelphia: lippincott williams & wilkins, 2008, p. 785.