Hydrocodone 10-660mg is a prescription-strength combination medication used for the relief of moderate to moderately severe pain. It contains 10 mg of hydrocodone bitartrate, an opioid pain reliever that works on the central nervous system to change how the body perceives pain, and 660 mg of acetaminophen, a non-opioid analgesic that enhances the pain-relieving effects of hydrocodone while also reducing fever. This formulation was once widely prescribed for post-surgical pain, injury recovery, and chronic conditions such as arthritis. However, the high dose of acetaminophen in each tablet posed a significant risk for liver toxicity, especially in patients taking multiple doses per day or those consuming alcohol.