That's something only your doctor can answer. It's never safe to take more than what your doctor prescribed for you. If the prescribed dosage isn't relieving your pain, talk with your doctor about perhaps trying a different medication.
Keep in mind that Norco contains acetaminophen so be sure to check the ingredients of any over-the-counter medications you may take to make sure you're not getting too much acetaminophen, which can damage your liver.
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