Are NSAIDs Really Better Than Opioids for Post-Operative Pain?

By Pat Anson, PNN Editor

There have been a rash of recent studies promoting the use acetaminophen and non-steroidal anti-inflammatory drugs (NSAIDs) over opioids for post-operative pain.

One such study at a Houston hospital led surgeons to conclude that patients were better off with Tylenol. "This study provides us with a strategy to successfully manage pain after surgery using over-the-counter pain medication,” said Min Kim, MD, head of thoracic surgery at Houston Methodist Hospital.  

But critics point out that most of the studies never examine how patients feel about the effectiveness of their pain treatment — focusing instead on the number of opioid pills and smaller opioid doses being prescribed. Pain relief was a secondary consideration, if it was considered at all.

A rare exception to that is a study recently published in the Canadian Medical Association Journal (CMAJ), which found that ibuprofen and other NSAIDs gave better post-operative pain relief than the opioid codeine. In a systematic review of 40 clinical trials involving over 5,000 patients who had outpatient procedures, researchers said patients who took NSAIDs had lower pain scores 6 and 12 hours after surgery than patients taking low doses of codeine.

"In all surgery types, subgroups and outcome time points, NSAIDs were equal or superior to codeine for postoperative pain," wrote lead author Matthew Choi, MD, Associate Professor of Surgery at McMaster University in Ontario. "We found that patients randomized to NSAIDs following outpatient surgical procedures reported better pain scores, better global assessment scores, fewer adverse effects and no difference in bleeding events, compared with those receiving codeine.

“These findings are of general importance to any clinician performing painful medical procedures. The various trials in our meta-analysis evaluated a range of procedures, different NSAID types and various degrees of acetaminophen coadministration.”

But critics say the McMaster study also has flaws. The claim that “all surgery types” and “a range of procedures” were included in the analysis is misleading at best. Most of the studies — 28 of the 40 that were analyzed — involved dental surgery, a fact that is not sufficiently disclosed. The rest of the outpatient procedures were for plastic surgery and orthopedic corrections – which can hardly be compared to more serious surgeries that require more pain relief and days or weeks of recovery, not just 6 to 12 hours.      

Another issue is the use of codeine as a research subject. Stefan Franzen, PhD, a chemistry professor at North Carolina State who has an extensive background in biomedical research, questions whether low doses of codeine should even be compared to NSAIDs.

“I question the premise that codeine is the drug that is or should be used by dentists,” said Franzen, author of “Patient Z,” a book the examines the criminalization of pain care. “I read a few papers not cited by this report and they too do not find a great efficacy for codeine. Part of this may be dose. Most commonly they are using 30-60 mg of codeine, which is 5-10 mg of morphine. Not very much if you have severe pain.

“Codeine may be a poor choice, but it may also be a straw man. Why not use tramadol, for example?”

‘Manipulated Data’

Patient advocate Bill Murphy also has doubts about the selection criteria used in studies touting the benefits of non-opioid pain relievers. He believes some researchers cherry-pick evidence to support a conclusion they’ve already reached.

“Opioid sparing post-op surgery programs are nothing more than an attempt to solve a non-problem and in doing so, patients suffer needlessly. The data produced from such programs are very often manipulated by those who designed the program in an obvious attempt to skew the results in favor of a program they endorsed,” said Murphy, who helped get legislation passed in New Hampshire to ensure that pain patients have access to opioid medication.

Murphy has advocated on behalf of patients at Portsmouth Regional Hospital, which has an “Enhanced Surgical Recovery” program that significantly reduced the use of opioids. Instead of Vicodin, patients get Neurontin or nerve blocks for pain relief.

“I was personally called in to advocate on behalf of several patients who were left to suffer in pain following surgery only to have staff assure them their pain was being well managed,” Murphy explained in an email. “Surgeons and nurses reported they were doing very well with Portsmouth Regional’s new protocol for managing post-op pain when in fact, they were not doing ‘very well’ at all.

“These patients were in horrible pain. Of the three I spoke with, none were ever provided any relief. I was with one patient as she was discharged. She was in tears and moved at a glacial pace due to pain as her son and I helped her into his vehicle outside. It was heartbreaking to watch. Her adult son was furious. I stayed in touch with each patient for several weeks afterwards. Each suffered greatly, one was not making any gains in physical therapy due to her lasting pain.”

In 2019, only 11% of patients were prescribed an opioid while at the Portsmouth hospital, and less than 6% were discharged with an opioid prescription. Murphy says the hospital’s policy inevitably leads to some patients with poorly treated pain.  

“What Portsmouth Regional Hospital’s ‘Enhanced Surgical Recovery’ program was doing is akin to making patients bite down on a piece of wood, grind it out, and then convince them the whole experience was for their own good,” says Murphy.