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acetaminophen (the active ingredient in Tylenol). Hydrocodone is a potent opioid that relieves moderate to severe pain. Acetaminophen is a less potent painkiller used to enhance the effects of hydrocodone.

Supplied in tablet form, Norco is most often prescribed in two strengths: either 5 mg, 7.5 mg, or 10 mg of hydrocodone combined with 325 mg of acetaminophen. Before the FDA lowered the level of acetaminophen allowed, Norco had the lowest amount of acetaminophen for any hydrocodone drugs. Currently, it has the highest amount of acetaminophen allowed (325 mg) — slightly more than the 300 mg found in Vicodin.