Drug interactions
Buprenorphine long-acting + Pentazocine
Severity: Major
Buprenorphine long-acting and Pentazocine: major interaction.
Last updated Sources: US FDA label
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
Both drugs act on opioid receptors, and combined use may increase sedation and respiratory depression. Competition at the receptor may cause reduced analgesia or withdrawal, and the long-acting injection cannot be quickly removed.
What this interaction means in plain words
Buprenorphine long-acting 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
Additive CNS depression and competing partial agonist/antagonist activity at opioid receptors.
What to do
Avoid pentazocine in patients on long-acting buprenorphine and use non-opioid options. If it is given, monitor sedation, respiration and withdrawal.
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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References
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 Buprenorphine long-acting with Pentazocine?
MediHelp rates the interaction as major. Buprenorphine long-acting 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. Both drugs act on opioid receptors, and combined use may increase sedation and respiratory depression. Competition at the receptor may cause reduced analgesia or withdrawal, and the long-acting injection cannot be quickly removed.
How serious is the interaction between Buprenorphine long-acting 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 pentazocine in patients on long-acting buprenorphine and use non-opioid options. If it is given, monitor sedation, respiration and withdrawal.
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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