Can You Take Ketorolac and Cyclobenzaprine Together?
Yes, ketorolac and cyclobenzaprine can be taken together safely in adults without contraindications, though this combination may not provide additional pain relief beyond using ketorolac alone.
Evidence for Co-Administration
The combination of ibuprofen plus cyclobenzaprine has been directly studied in acute musculoskeletal pain. Low-certainty evidence from guideline-level research shows that ibuprofen plus cyclobenzaprine did not demonstrate statistically significant pain reduction at less than 2 hours or at 1 to 7 days compared with placebo 1. Since ketorolac is also an NSAID like ibuprofen, this suggests the combination may not offer synergistic benefit.
However, there are no documented drug-drug interactions or safety concerns that would contraindicate using these medications together. The FDA labels for both medications do not list each other as contraindications 2, 3.
Clinical Considerations
When This Combination Makes Sense:
- Acute musculoskeletal injuries with significant muscle spasm component where you want to address both inflammation/pain (ketorolac) and muscle spasm (cyclobenzaprine) separately
- Patients who have failed monotherapy with NSAIDs alone
- Short-term use only (≤5 days for ketorolac per FDA guidelines) 2
Dosing Recommendations:
Ketorolac:
- Adults 17-64 years: 20 mg PO once, then 10 mg every 4-6 hours as needed, not exceeding 40 mg/day 2
- Adults ≥65 years, renally impaired, or <50 kg: 10 mg PO once, then 10 mg every 4-6 hours as needed, not exceeding 40 mg/day 2
- Maximum duration: 5 days total (including any IV/IM dosing) 2
Cyclobenzaprine:
- Start with 5 mg TID (as effective as 10 mg TID with less sedation) 3, 4
- Elderly or hepatically impaired: initiate at 5 mg and titrate slowly 3
Important Safety Warnings
Ketorolac-Specific Risks:
- Gastrointestinal bleeding and perforation risk - highest with prolonged use >5 days, high doses, elderly patients, or those with prior ulcer history 2, 5
- Renal impairment - use with caution; contraindicated in advanced renal disease 2
- Bleeding risk - inhibits platelet function; avoid in patients on anticoagulants 2
- Cardiovascular events - MI and stroke risk similar to other NSAIDs 2
Cyclobenzaprine-Specific Risks:
- Sedation is the most common adverse effect (dose-related; less with 5 mg TID than 10 mg TID) 3, 4
- Dry mouth occurs frequently 3
- The combination will likely increase drowsiness - warn patients about driving and operating machinery
Additive Adverse Effects:
When combining these medications, expect:
- Increased sedation from cyclobenzaprine (occurs in 54-62% at therapeutic doses) 4
- GI side effects from ketorolac (nausea, dyspepsia, potential bleeding)
- The sedation from cyclobenzaprine may be perceived as beneficial by some patients but is a safety concern for others
Contraindications to This Combination
Do not use ketorolac if:
- History of or current risk of GI bleeding 2, 5
- Advanced renal failure or risk of renal failure 2
- Active peptic ulcer disease 2
- Recent coronary artery bypass graft surgery 2
- Hypersensitivity to aspirin or NSAIDs 2
- Concurrent anticoagulation 2
- Pregnancy (third trimester) or breastfeeding 2
Use cyclobenzaprine cautiously if:
- Moderate to severe hepatic impairment (not recommended) 3
- Elderly patients (higher plasma concentrations) 3
- Concurrent CNS depressants
Clinical Bottom Line
The combination is safe but may not be more effective than ketorolac alone for pain relief 1. The primary rationale for combining them would be to specifically target muscle spasm with cyclobenzaprine while treating pain/inflammation with ketorolac. Research in similar NSAID-muscle relaxant combinations (naproxen plus cyclobenzaprine) showed benefit for objective muscle spasm but more side effects, primarily drowsiness 6.
Limit ketorolac to ≤5 days maximum, use the lowest effective doses of both medications, and counsel patients extensively about sedation and GI risks.