<unk>  is an analgesic opioid that is FDA approved for the {{{indicationType}}} of pain, chronic (severe), in patients requiring a long-term daily around-the-clock opioid analgesic, pain (moderate to severe).   Common adverse reactions include dermatologic: pruritus (controlled-release, 13% ; immediate-release, 3% or greater ), sweating (controlled-release, 5% ; immediate-release, less than 3% ), gastrointestinal: abdominal pain (up to 5% ), constipation (controlled-release, 23% ; immediate-release, 3% or greater ), nausea (controlled-release, 23% ; immediate-release, 3% or greater ), vomiting (controlled-release, 12% ; immediate-release, 3% or greater ), xerostomia (controlled-release, 6% ; immediate-release, less than 3% ), neurologic: Asthenia (controlled-release, 6% ; immediate-release, 3% or greater ), dizziness (controlled-release, 13% ; immediate-release, 3% or greater ), headache (controlled-release, 7% ; immediate-release, 3% or greater ), somnolence (controlled-release, 23% ; immediate-release, 3% or greater ).
Oxycodone
Hydrocodone
Codeine
Morphine 
Acetaminophen 
Dihydrocodeine
Morpholine
Tramadol