Drug interactions
Butorphanol + Pentazocine
Severity: Moderate
Butorphanol and Pentazocine: moderate 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
Both are mixed agonist-antagonist opioids that share the same receptor targets, so combining them adds no analgesic advantage and increases sedation and respiratory depression. In opioid-dependent patients, either drug can precipitate withdrawal through antagonist activity at mu receptors.
What this interaction means in plain words
Butorphanol and Pentazocine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Butorphanol belongs to Musculoskeletal; Pentazocine belongs to Musculoskeletal.
Why it happens
Overlapping kappa agonism and mu partial agonism/antagonism produces additive CNS depression and competitive displacement that can precipitate withdrawal.
What to do
Avoid using two mixed agonist-antagonists together; use a single agent. Screen for opioid dependence and monitor sedation and respiratory rate if both are given.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Butorphanol
- Butorphanol + Olanzapine / samidorphan Contraindicated
- Butorphanol + Sodium oxybate Contraindicated
- Alfentanil + Butorphanol Major
- Alprazolam + Butorphanol Major
- Alvimopan + Butorphanol Major
- Amobarbital + Butorphanol Major
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 Butorphanol with Pentazocine?
MediHelp rates the interaction as moderate. Butorphanol and Pentazocine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both are mixed agonist-antagonist opioids that share the same receptor targets, so combining them adds no analgesic advantage and increases sedation and respiratory depression. In opioid-dependent patients, either drug can precipitate withdrawal through antagonist activity at mu receptors.
How serious is the interaction between Butorphanol and Pentazocine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using two mixed agonist-antagonists together; use a single agent. Screen for opioid dependence and monitor sedation and respiratory rate if both are given.
What other medicines interact with Butorphanol?
MediHelp also lists interactions of Butorphanol with, for example, Olanzapine / samidorphan, Sodium oxybate, Alfentanil. The full list is on the Butorphanol page.
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