Drug interactions
Levorphanol + Pentazocine
Severity: Major
Levorphanol and Pentazocine: 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
Pentazocine may blunt the effect of the full agonist levorphanol and can precipitate withdrawal in opioid-dependent patients. In others, the two drugs may add to sedation and respiratory depression.
What this interaction means in plain words
Levorphanol and Pentazocine 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
Mixed agonist-antagonist at opioid receptors competes with a full mu agonist, plus additive CNS depression.
What to do
Avoid using together; do not add pentazocine to patients on levorphanol. If unavoidable, monitor for withdrawal, pain control and respiratory depression.
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 Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
Frequently asked questions
Can I take Levorphanol with Pentazocine?
MediHelp rates the interaction as major. Levorphanol and Pentazocine 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. Pentazocine may blunt the effect of the full agonist levorphanol and can precipitate withdrawal in opioid-dependent patients. In others, the two drugs may add to sedation and respiratory depression.
How serious is the interaction between Levorphanol and Pentazocine?
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 using together; do not add pentazocine to patients on levorphanol. If unavoidable, monitor for withdrawal, pain control and respiratory depression.
What other medicines interact with Pentazocine?
MediHelp also lists interactions of Pentazocine with, for example, Calcium / magnesium / potassium / sodium oxybates, Olanzapine / samidorphan, Phenelzine. The full list is on the Pentazocine page.
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