Opioids are often referred to as more potent analgesics, which can be divided into weak opioids and strong opioids. The most common weak opioid is tramadol, codeine, etc., these belong to the weak opioid, strong opioid drugs on behalf of drugs are morphine, oxycodone, fentanyl, these are strong opioid drugs. Whether it is a weak opioid or a strong opioid, these drugs are controlled substances when used, which means that they need to be taken under the supervision of a doctor. These pain medications are used to treat pain, but do not want to treat pain and lead to addiction to drugs, so it is important to regulate the use of this drug under the guidance of a doctor to better avoid addiction. The other is that opioid drugs have some side effects, so in the process of use should be observed, there are no adverse reactions including respiratory depression, or the most common constipation and so on.