Drug interactions
Diphenoxylate + Pentazocine
Severity: Moderate
Diphenoxylate 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
Diphenoxylate is an opioid-type antidiarrheal that at high doses acts as an opioid agonist. With pentazocine there may be additive sedation and respiratory depression, and withdrawal may occur in dependent patients.
What this interaction means in plain words
Diphenoxylate 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.
Diphenoxylate belongs to Gastrointestinal Tract; Pentazocine belongs to Musculoskeletal.
Why it happens
Additive opioid CNS depression with partial mu antagonism by pentazocine.
What to do
Avoid unnecessary co-use and keep diphenoxylate at labeled doses. Monitor sedation and respiratory status, and watch for withdrawal in opioid-dependent patients.
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 Pentazocine
- Calcium / magnesium / potassium / sodium oxybates + Pentazocine Contraindicated
- Olanzapine / samidorphan + Pentazocine Contraindicated
- Pentazocine + Phenelzine Contraindicated
- Pentazocine + Tranylcypromine Contraindicated
- Alfentanil + Pentazocine Major
- Alprazolam + Pentazocine Major
Other interactions of Diphenoxylate
Frequently asked questions
Can I take Diphenoxylate with Pentazocine?
MediHelp rates the interaction as moderate. Diphenoxylate 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. Diphenoxylate is an opioid-type antidiarrheal that at high doses acts as an opioid agonist. With pentazocine there may be additive sedation and respiratory depression, and withdrawal may occur in dependent patients.
How serious is the interaction between Diphenoxylate 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 unnecessary co-use and keep diphenoxylate at labeled doses. Monitor sedation and respiratory status, and watch for withdrawal in opioid-dependent patients.
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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