Drug interactions
Lithium + Parecoxib
Severity: Major
Lithium and Parecoxib: 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
Parecoxib, which is converted to valdecoxib, is an NSAID that can reduce renal lithium clearance and raise serum lithium levels. This can lead to lithium toxicity with tremor, confusion, ataxia and gastrointestinal symptoms.
What this interaction means in plain words
Lithium and Parecoxib 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
Inhibition of renal prostaglandin synthesis reduces renal blood flow and sodium excretion, increasing proximal tubular lithium reabsorption.
What to do
Avoid the combination where possible and use an alternative analgesic such as paracetamol. If it is needed, check lithium levels at baseline and within about a week, and watch for signs of toxicity.
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 Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Frequently asked questions
Can I take Lithium with Parecoxib?
MediHelp rates the interaction as major. Lithium and Parecoxib 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. Parecoxib, which is converted to valdecoxib, is an NSAID that can reduce renal lithium clearance and raise serum lithium levels. This can lead to lithium toxicity with tremor, confusion, ataxia and gastrointestinal symptoms.
How serious is the interaction between Lithium and Parecoxib?
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 the combination where possible and use an alternative analgesic such as paracetamol. If it is needed, check lithium levels at baseline and within about a week, and watch for signs of toxicity.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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