Drug: Hydrocodone. 1. Provide background on the disease or dysfunction the drug is prescribed to treat. R/ Hydrocodone is commonly prescribed for pain relief in conditions such as osteoarthritis, rheumatoid arthritis, back pain, and cancer. It is often used in combination with other pain relievers such as acetaminophen or ibuprofen. 2. Describe the cell type(s) within the tissues that the disease targets and their general function. R/ The mu-opioid receptor is primarily found on neurons in the central nervous system, including the brain and spinal cord. These receptors are involved in the regulation of pain perception, mood, and reward, among other functions. -Please enrich my answers with explicit details..