The biggest review of opioid painkillers ever done found that these drugs often give only a small, short‑term benefit for sudden pain. Sometimes they do not help at all.
Scientists at the University of Sydney looked at medicines such as codeine, morphine, oxycodone and tramadol. They combined results from 59 other reviews that covered more than 50 kinds of acute pain in kids and adults.
The findings were published in the journal Drugs. This is the most detailed look to date at when opioids work, when they don’t, and where we still lack proof.
Overall, taking an oral opioid was only a little better than a fake pill for muscle or bone pain in the first 6‑48 hours. Opioids also caused more side effects for that kind of pain, for some post‑surgery aches, and for painful limb injuries.
These results challenge the common idea that opioids are the best first choice for sudden pain.
Where Opioids May Help
Some conditions showed modest, short‑term relief from opioids. These include stomach pain, dental surgery pain, ear‑procedure pain, traumatic limb injuries, childbirth, C‑section recovery, and bunion removal.
Where Opioids Do Not Help
For many other problems, opioids performed no better than a placebo. This includes certain limb surgeries, kidney‑stone pain, pain after tonsil removal, and pain in newborns who need breathing assistance.
Evidence was also mixed for heart‑related pain, pain after hysterectomy, and skin‑pain patches that contain opioids.
Side Effects and Safety
Beyond limited pain relief, opioids raised the risk of side effects such as nausea and vomiting, especially for muscle/bone pain, limb injuries, and some post‑surgical aches.
Even short‑term use can lead to tolerance, dependence, misuse, overdose, hospital stays, or death when the drugs are taken regularly.
What Doctors and Patients Should Do
The study says opioids should not be the default choice for acute pain. Doctors need to prescribe the lowest effective dose for the shortest time needed.
Patients of all ages should be told about the possible harms before starting an opioid.