One kind of opioid pain reliever is dihydrocodeine. It is usually given to relieve moderate to severe pain, particularly when over-the-counter painkillers like ibuprofen or paracetamol are insufficiently effective. A often given dosage of 30 mg is effective in reducing pain related to ailments such post-operative discomfort. https://www.diigo.com/item/note/b9tut/cb8r?k=5c20c6ac06d210c41c4c28ddd52c5580