Drug interactions
Ketorolac intranasal + Pemetrexed
Severity: Major
Ketorolac intranasal and Pemetrexed: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Ketorolac is an NSAID that can reduce renal function and decrease pemetrexed clearance, raising pemetrexed exposure. This increases the risk of myelosuppression, mucositis and renal toxicity, particularly in patients with reduced renal function.
What this interaction means in plain words
Ketorolac intranasal and Pemetrexed can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Reduced renal elimination of pemetrexed via NSAID-induced decreases in renal perfusion and possible competition for tubular secretion.
What to do
Avoid ketorolac around pemetrexed dosing, holding short half-life NSAIDs from about 2 days before to 2 days after pemetrexed. Use an alternative analgesic such as paracetamol and monitor renal function and blood counts.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Pemetrexed
Frequently asked questions
Can I take Ketorolac intranasal with Pemetrexed?
MediHelp rates the interaction as major. Ketorolac intranasal and Pemetrexed can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Ketorolac is an NSAID that can reduce renal function and decrease pemetrexed clearance, raising pemetrexed exposure. This increases the risk of myelosuppression, mucositis and renal toxicity, particularly in patients with reduced renal function.
How serious is the interaction between Ketorolac intranasal and Pemetrexed?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid ketorolac around pemetrexed dosing, holding short half-life NSAIDs from about 2 days before to 2 days after pemetrexed. Use an alternative analgesic such as paracetamol and monitor renal function and blood counts.
What other medicines interact with Pemetrexed?
MediHelp also lists interactions of Pemetrexed with, for example, Bacitracin, Brexucabtagene autoleucel, Celecoxib. The full list is on the Pemetrexed page.
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