Procyclidine and Acetaminophen And Codeine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jun 30, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Acetaminophen And Codeine
Procyclidine
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Your pain medicine contains codeine, which can slow down your gut and make constipation more likely. Procyclidine is an anticholinergic medicine, and it can also slow the gut and make it harder to empty your bladder. Taken together, these two effects can add up.
In rare cases, the bowel can slow down so much that it nearly stops moving (this is called a paralytic ileus). The good news is this is a theoretical concern, meaning it is based on how the drugs work rather than lots of real cases. Watch for bad constipation, belly bloating, or trouble urinating, and let your care team know. They can manage this safely.
Effect: Additive risk of severe constipation, urinary retention, and potentially paralytic ileus.
Mechanism: Codeine (an opioid) reduces GI motility; procyclidine (an antimuscarinic anticholinergic) further inhibits smooth muscle motility and bladder emptying. Effects are additive (PD interaction), not metabolic.
- Direction: Increased anticholinergic/constipating burden.
- Severity: Major; evidence: theoretical.
- Onset: Unspecified.
Management: Monitor for reduced gastric motility, abdominal distension, and urinary retention. Consider prophylactic bowel regimen; dose may be individualized by the care team. Reassess if obstructive symptoms develop.
What happens
An increased risk of paralytic ileus
Interaction Deep Dive
Taking codeine together with anticholinergic agents can heighten the likelihood of urinary retention and/or severe constipation, potentially progressing to paralytic ileus. When these two are administered together, watch patients for indications of urinary retention or diminished gastric motility1.
Why it happens (mechanism)
Additive effects on gastric motility
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This interaction is manageable with awareness and monitoring.
- Watch for severe constipation, belly bloating or cramping, no bowel movements, or trouble passing urine.
- Staying hydrated and active, and asking your team about a stool softener, may help.
- Your care team may monitor you more closely and can adjust and individualize your doses if needed.
Contact your pharmacist or doctor promptly if you notice these symptoms, and seek urgent care for severe belly pain, vomiting, or a swollen, hard abdomen.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Procyclidine and Acetaminophen And Codeine together?
Combining codeine with procyclidine can add up to worse constipation and urinary retention, rarely leading to a stalled bowel. Keep taking both as prescribed, watch for these symptoms, and tell your care team if they appear. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Procyclidine and Acetaminophen And Codeine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Procyclidine and Acetaminophen And Codeine interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. This interaction is manageable with awareness and monitoring. Watch for severe constipation, belly bloating or cramping, no bowel movements, or trouble passing urine. Staying hydrated and active, and asking your team about a stool softener, may help. Your care team may monitor you more closely and can adjust and i… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Procyclidine or Acetaminophen And Codeine need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: CARISOPRODOL, ASPIRIN, CODEINE PHOSPHATE oral tablets, carisoprodol, aspirin, codeine phosphate oral tablets. Ingenus Pharmaceuticals LLC (per DailyMed), Orlando, FL, 2021. DailyMed
Keep reading about Acetaminophen And Codeine
Keep reading about Procyclidine
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