Analgesics for Acute Pain in Adults
Full update January 2020
Acute pain results from trauma or acute illness (e.g., renal colic, heart attack, sickle cell crisis).4,20 As opposed to chronic pain, its etiology and location is usually clear.4 Acute pain is self-limited, improving over hours to weeks as the injury heals.4 Treatment minimizes detrimental physiologic responses (e.g., tachycardia, shallow breathing, immobility, muscle spasms, ileus, impaired immune response), adverse psychological effects (e.g., anxiety, fear), and progression to chronic pain.4,20 Set realistic goals for pain relief and function; complete pain relief may not be a realistic goal, such as after major surgery.4 Acute use of opioids turns into chronic use in 50% of patients,30 so consider screening patients for drug or alcohol abuse before prescribing even short-term opioids. Research is ongoing to develop guidelines for post-op opioid prescribing to address over-prescribing and reduce potential for abuse.67,68 Some hospitals are developing ALternatives To Opioid (ALTO)74 or Enhanced Recovery After Surgery (ERAS) protocols. Perioperatively, different medications and routes are combined (i.e., a multimodal or balanced approach) to increase efficacy and decrease side effects.4,56 See our chart, Treatment of Acute Low Back Pain, for specifics regarding this disorder. For pain management in kids, see our chart, Analgesics in Kids: FAQs. The charts below review various analgesics to treat different types and severities of acute pain in adults. The first chart reviews preferred or first-line analgesics for acute pain. The second chart reviews other analgesic options that can be considered for use in patients with acute pain.
Abbreviations: CABG = coronary artery bypass graft; ED = emergency department; IV = intravenous; MI = myocardial infarction; NSAID = nonsteroidal anti-inflammatory drug; PCA = patient-controlled analgesia; SSRI = selective serotonin reuptake inhibitor.
Preferred Analgesics for Acute Pain in Adults
Drug or Drug Class
Mild to moderate pain from:4,6,16
Use WITH acetaminophen for better efficacy (e.g., [adults] acetaminophen 500 to 1,000 mg WITH ibuprofen 200 to 400 mg every six hours as needed).17
Opioid-sparing effect in more severe pain.4
One in two to three patients with moderate to severe pain has a 50% reduction in pain over four to six hours.1
Oral ibuprofen at doses of 400, 600, and 800 mg provide similar pain relief.1,7,76
Ibuprofen 400 mg plus acetaminophen 1,000 mg lowers moderate-to-severe acute extremity pain as well as many opioid and acetaminophen combinations.75
Oral ketorolac has similar efficacy to other NSAIDs, but the risks associated with its use outweigh the possible benefits.57-59
Topical NSAIDs may work as well as oral NSAIDs for acute musculoskeletal pain (e.g., sprain).16
Reserve injectable NSAIDs (e.g., ketorolac [most cost effective of available IV NSAIDs]) for patients unable to take oral NSAIDs.8,a
Available IV NSAIDs and their average max-dose cost/day are:a diclofenac (Dyloject [U.S. only; ~$64]), ibuprofen (Caldolor [U.S. only; ~$70]), ketorolac (Toradol [U.S.: ~$10; Canada: ~$20]), meloxicam (Anjeso [U.S. only; ~$94]). Note: Anjeso may not be appropriate for acute pain due to slow onset (~2 to 3 hours vs ~1 hour with other IV NSAIDs).42
Injectable ketorolac is equally effective compared to oral ibuprofen for moderate to severe pain.40
There is no good evidence to show IV NSAIDs work better than oral NSAIDs. And, there's no good evidence IV meloxicam is safer than other injectable NSAIDs, despite being more COX-2 selective.
In the U.S., NSAIDs are contraindicated for perioperative pain due to CABG.
Occasional or short-term use of OTC ibuprofen or naproxen should be safe for most stable patients.9,15
Avoid CHRONIC use of NSAIDs in patients with heart failure, or diabetic or other chronic kidney disease.5,9,10,24,39
Patients for whom an NSAID is indicated (see above), but not desirable.
Use WITH an NSAID for better efficacy (e.g., acetaminophen 500 to 1,000 mg WITH ibuprofen 200 to 400 mg every six hours as needed in adults).17
One in three to four patients with moderate to severe pain has a 50% reduction in pain over four to six hours with acetaminophen 1,000 mg.1
Acetaminophen 1,000 mg is NOT more effective than acetaminophen 500 mg.1
Ibuprofen 400 mg plus acetaminophen 1,000 mg lowers moderate-to-severe acute extremity pain as well as many opioid and acetaminophen combinations.75
In chronic liver impairment, limit the total daily dose to 2 to 3 grams (instead of the usual 4 gram max adult daily dose).14,37
Reserve parenteral acetaminophen (Ofirmev in U.S.) for patients unable to take it orally or rectally. There is no evidence of superior efficacy with IV administration, and it is MUCH more expensive (~$0.10/day [oral], $190/day [IV]).41,61,a
Gabapentinoids (gabapentin or pregabalin)
The greatest benefit has been seen with preoperative doses given for abdominal, breast, and lumbar disk surgeries.47,54,55
Perioperative gabapentinoids may reduce postoperative pain, nausea, and opioid use.46,47,72,73
See our chart, Comparison of Gabapentin and Pregabalin, for place in therapy, periop dosing considerations, and common side effects.
Moderate to severe pain (e.g., dental pain, postoperative pain, pain due to trauma, musculoskeletal pain) not relieved by nonopioids, assuming patient can take oral medications.4,18,20,56
Not proven more effective than ibuprofen 400 mg at achieving 50% reduction in moderate to severe pain.1
Do not use extended-release opioids for acute pain.19
May be equally effective compared to IV opioids, even after significant surgeries (e.g., cardiac surgery).43
Prescribe only enough for the anticipated duration of severe pain. Three to seven days is often enough.65
Advise patients to wean off the opioid to over-the-counter (OTC) analgesics (e.g., acetaminophen, NSAIDs) as their pain resolves.19
Oral opioids work just as well as IV opioids, but IV opioids have a quicker onset of action, allowing for faster titrations.56
Moderate or severe pain after invasive surgery (e.g., open abdominal surgery).4
Moderate or severe postoperative pain in patient who cannot take oral medications.4,56
Moderate to severe pain due to major trauma, MI (despite nitroglycerin), burns, or biliary colic.20,35
(For more on lidocaine patches and other topical pain relievers, see our chart, Topicals for Pain Relief.)
Perioperative use in patients at high risk from opioids or general anesthesia (e.g., pulmonary disease, morbid obesity).4,33
Abdominal surgery, carotid endarterectomy, upper extremity surgery, hand surgery (peripheral nerve block).4,36,38
Deep laceration repair or surgical site pain (local infiltration).4,31
Severe post-op pain in ICU patients.60
Acute, chronic, or refractory pain in patients presenting to the ED (e.g., long-bone fractures, back pain, abdominal pain).62
Limited data suggest that low-dose IV ketamine (<1 mg/kg) may provide similar pain relief compared to opioids in the ED for pain from a variety of causes.62,64
IV ketamine may provide an opioid-sparing effect, especially in surgeries associated with severe post-op pain (e.g., abdominal or thoracic surgeries).27,60
Ketamine seems to work about as well as morphine in the emergency room for acute pain (e.g., fractures, renal colic).3,77
- Costs are based on wholesale acquisition cost (WAC). U.S. pricing by Elsevier, accessed June 2020 (February 2021 for Exparel and Xaracoll).
Not Preferred for Acute Pain
Drug or Drug Class
Buprenorphine is a mixed opiate with partial agonist and antagonist activity.42
Parenteral buprenorphine 0.3 mg is considered equivalent to parenteral morphine 10 mg for acute pain.44
Buprenorphine might be a safer choice than a full opioid in patients with respiratory depression.
See our chart, FAQs About Buprenorphine for Chronic Pain, for more on buprenorphine, including why sublingual, buccal, and transdermal buprenorphine products should NOT be used for acute pain.
Codeine is metabolized to morphine via CYP2D6.2
Avoid codeine in children and breastfeeding women.45,48
Reserve the non-injectable fentanyl products for patients with chronic pain who are opioid-tolerant (e.g., have been taking the equivalent of at least 60 mg of morphine daily for at least one week) due to risk of toxicity, including respiratory depression.34,50
Meperidine has a neurotoxic metabolite, normeperidine. Normeperidine may accumulate with repeated meperidine dosing, especially in patients with renal or hepatic impairment and in the elderly.28,29
Side effects of meperidine may include seizures, myoclonus, tremor, confusion, dysphoria, and delirium.28,42
Naloxone is not effective for treating normeperidine toxicity, and in fact may worsen it.29
Use meperidine with caution in patients with arrhythmias due to risk of an increased rate of ventricular response.42
Use with caution in patients taking other serotonergic meds (e.g., SSRIs, cyclobenzaprine) due to risk of serotonin syndrome.42
A full opioid agonist with no proven advantage over morphine.
There is a ceiling dose of 27 mg/day due to risk of QT prolongation. Once a cumulative daily dose of 27 mg is met, a different analgesic will be needed until the next day.80
There is limited safety data beyond 48 hours.80,81
The initial dose is 1.5 mg IV push. Single doses >3 mg have not been studied. In clinical trials, doses of 1 to 3 mg could be given every one to three hours as needed. For patient-controlled analgesia, the initial dose is 1.5 mg with an on-demand dose of 0.35 to 0.5 mg with a six-minute lockout. A healthcare provider can administer additional doses of 0.75 mg each hour.80
Patients taking a moderate to strong CYP2D6 or CYP3A4 inhibitor may need less frequent dosing. CYP3A4 inducers may reduce efficacy.80
Analgesic effects of partial agonists (kappa)/antagonists (mu) are limited by a dose ceiling.51
Avoid in opioid-tolerant patients, as use may lead to withdrawal symptoms (e.g., anxiety, agitation, dysphoria).42
Butorphanol use is often reserved for pain when other options are not effective, tolerated, or inadequate.63
Nalbuphine efficacy and safety data compared with morphine are inconsistent.52
See our chart, Equianalgesic Dosing of Opioids for Pain Management, for equivalent doses, other considerations, and potential side effects.
Muscle relaxants are not generally recommended for most patients with chronic low back pain due to lack of evidence.79 For alternatives, see our chart, Treatment of Chronic Low Back Pain.
Adverse effects (e.g., sedation, dizziness, etc) are common with all muscle relaxants.79 The CNS depression commonly seen with muscle relaxants is additive with other CNS depressants (e.g., opioids, alcohol, benzodiazepines) and has led to respiratory depression and death.79 Muscle relaxants should be used cautiously in the elderly as most are listed on the Beers Criteria as potentially inappropriate for use in older adults due to their sedative effects, increased risk of falls, etc.79
Muscle relaxants may be used for acute pain that is not relieved with NSAIDs and acetaminophen.79 They should not be used longer than two to three weeks, and many recommend limiting their duration to no more than seven days.79 Our chart, Treatment of Acute Low Back Pain, offers alternatives.
The old product Orphengesic Forte (orphenadrine 50 mg, aspirin 770 mg, caffeine 60 mg) was reintroduced in 2020 for mild to moderately painful musculoskeletal conditions.78 It is important to note the aspirin content of this product; the maximum dose provides a total daily aspirin dose of 3,080 mg.
For more information on orphenadrine and other muscle relaxants for pain, see our chart, Muscle Relaxants.
One in eight patients with moderate to severe pain has a 50% pain reduction over four to six hours with tramadol.1
Efficacy of tramadol is reduced in poor CYP2D6 metabolizers and by strong CYP2D6 inhibitors.23
Tramadol has many drug interactions (e.g., SSRIs), including additive serotonergic side effects (e.g., nausea, central nervous system stimulation).42
Tramadol can lower the seizure threshold.25
Maximum adult daily dose 300 mg or 400 mg, depending on product.25,26
See product labeling for dosing in elderly patients, or in patients with renal or hepatic dysfunction.
Avoid tramadol in children and breastfeeding women.45,49
Project Leader in preparation of this clinical resource (360123): Beth Bryant, Pharm.D., BCPS, Assistant Editor, last modified March 2021.
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Cite this document as follows: Clinical Resource, Analgesics for Acute Pain in Adults. Pharmacist’s Letter/Prescriber’s Letter. January 2020.
- Don’t Buy Any Hype About Orphengesic Forte for Muscle Pain
- Create Pathways to Promote Non-Opioids for Pain in Your ED
- Use Multiple Strategies to Manage Pain During Injectable Opioid Shortages
- Explain How Exparel Compares to Other Local Anesthetics for Post-Op Pain
- Combine Acetaminophen PLUS an NSAID Instead of an Opioid for Acute Pain