Tramadol is increasingly used to manage chronic noncancer pain, but as compared with opioids, it appears to be linked to a higher risk for adverse outcomes, according to new data.
Among a cohort of patients who received a prescription for either tramadol or codeine for orthopedic-related pain, tramadol was significantly associated with a higher risk of mortality, cardiovascular events, and fractures.
Dr. Daniel H. Solomon
However, there was no significant difference in the risk of falls, delirium, constipation, opioid abuse/dependence, or sleep disorders between the two drugs.
“However, this is a retrospective cohort study, and despite it providing information that would otherwise be impossible to gather – such as from randomized controlled trials – clinicians should not solely base their decision on this study,” cautioned lead author Carlen Reyes, MD, PhD, of the Institut Universitari d’Investigació en Atenció Primària (IDIAP Jordi Gol), Barcelona.
Dr. Reyes noted that the intake of tramadol and codeine was analyzed using the number of “packages” that were dispensed, as an approximation of the real intake. “Logically we could think that the more packages dispensed of one drug, the more dose the patient is taking, but this is not always true given the availability of different doses commercialized of tramadol and different doses prescribed,” she said. “Given that we did not account for the real dose prescribed, we can only suspect an increased risk of these outcomes and reinforce the need for further prospective studies with more specific dose-response analysis comparing tramadol and codeine.”
The paper was published Oct. 19 in JAMA.
Tramadol has been considered to be a relatively safe opioid and was even strongly recommended by the American Academy of Orthopaedic Surgeons for patients experiencing symptomatic knee osteoarthritis. The authors point out that studies looking at opioid use from 2019 to 2020 show that tramadol was the most prescribed opioid in England, the Netherlands, and Spain.
In the United States, the age-adjusted rate of drug overdose deaths from synthetic opioids rose from 1.0 per 100 000 in 2013 to 11.4 in 2019. Most of these deaths were attributable to fentanyl but some were also related to tramadol.
But despite its wide use in managing chronic noncancer pain, results of recent studies suggest adverse outcomes as compared with other agents. Last year, one study found that older patients who received tramadol had a significant increase in the risk of hip fracture vs. those using NSAIDs or codeine. Another study, also published in 2020, showed that patients with osteoarthritis who were treated with tramadol had a 20%-50% higher risk of dying during the first year of treatment than did patients who were treated with NSAIDs.
In the current paper, Dr. Reyes and colleagues evaluated the association of tramadol with mortality and other adverse clinical outcomes in outpatient settings, compared with codeine.
They conducted a retrospective, population-based, propensity score–matched cohort study using a primary care database that routinely collects medical records and pharmacy dispensations for more than 80% of the population of Catalonia, Spain. The cohort included people 18 years or older who had been prescribed tramadol or codeine from 2007 to 2017 and were followed up to Dec. 31, 2017.
After propensity score matching, the final analysis included 368,960 participants: 184,480 in the tramadol arm and 184,480 in the codeine arm.
The mean age of patients was 52.7 years in the tramadol arm and 53.5 years in the codeine arm, and the prevalence of cancer was 3.2% and 3.3%, respectively. The most common diagnoses in this cohort were back pain (47.5% vs. 48.5%), neck/shoulder pain (28.6% vs. 29.5%), and osteoarthritis (15.3% vs. 15.5%). The most commonly used drugs were ibuprofen (34.4% vs. 34.3%) and paracetamol/acetaminophen (37.1% vs. 36.8%)