Acetaminophen And Codeine and Piritramide: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 1, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Acetaminophen And Codeine
Piritramide
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.
Both of these medicines are opioids. Codeine (combined with acetaminophen) is used for pain, and piritramide is a strong opioid painkiller. When you take two opioids together, their effects add up. That means you may feel very sleepy or slowed down, and your breathing can become dangerously slow. There is also a small, mostly theoretical concern about serotonin syndrome, which can cause agitation, shakiness, sweating, or a fast heartbeat.
The good news is that your care team can manage this safely by choosing the lowest doses needed and watching you closely. Please don't stop or change either medicine on your own, just talk with your doctor or pharmacist about the safest plan.
Effect: Additive CNS and respiratory depression from two concurrent opioids (codeine plus piritramide), with a theoretical additive serotonergic risk (serotonin syndrome).
- Mechanism: Additive mu-opioid agonism causing CNS/respiratory depression; additive serotonergic activity.
- Direction: Increased opioid effect and toxicity. Codeine is a prodrug (activated via CYP2D6 to morphine), but here the concern is pharmacodynamic additivity, not metabolic.
- Evidence: Theoretical; severity major; onset unspecified.
- Management: Avoid where alternatives exist. If required, use lowest effective doses and shortest duration; reduce codeine or the other agent. Monitor for sedation, hypoventilation, and serotonin syndrome. Consider prescribing naloxone.
What happens
Increased risk of respiratory and CNS depression and an increased risk of serotonin syndrome
Interaction Deep Dive
Do not combine opioid-containing cough preparations with CNS depressants2. When it comes to non-cough codeine products together with CNS depressants, limit such combined use to patients in whom other options prove insufficient. Should combined therapy be required, apply the lowest effective dose over the briefest period needed to meet therapeutic objectives. It may be appropriate to reduce the dose of either codeine or the CNS depressant, while carefully watching for sedation, respiratory depression, and any indications of serotonin syndrome. Furthermore, taking opioids alongside serotonergic agents has produced serotonin syndrome. When concurrent administration is unavoidable, monitor the patient closely, especially as therapy begins and when doses are being modified. Prescribing naloxone for emergency management of opioid overdose should be considered. Should serotonin syndrome be suspected, stop codeine 134.
Why it happens (mechanism)
Additive CNS depression; additive serotonergic effects
How to manage this interaction
Your care team can manage this combination safely. Typical steps include:
- Using the lowest effective dose of one or both opioids for the shortest time needed.
- Closer monitoring for excessive drowsiness, slowed or shallow breathing, and signs of serotonin syndrome (agitation, sweating, tremor, fast heart rate), especially when starting or changing doses.
- Possibly prescribing naloxone as an emergency rescue medicine.
- Choosing an alternative when one is available.
Keep taking both exactly as prescribed. Ask your pharmacist or prescriber before making any changes, and seek urgent help if breathing slows or you feel very hard to wake.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
5 reports — tap to read
a) One study found that emergency department visits linked to nonmedical use and involving both opioid analgesics and benzodiazepines rose significantly between 2004 and 2011, climbing from 11 to 34.2 per 100,000. Deaths from drug overdose attributable to prescribed and higher than prescribed doses of both drug classes also rose significantly, from 0.6 to 1.7 per 100,000, while overdose deaths attributable to benzodiazepines rose significantly from 18% to 31% 2.
b) A prospective cohort study reported that the rate of overdose deaths associated with the dispensing of both opioid analgesics and benzodiazepines was 10 times greater than with the dispensing of opioid analgesics alone (7 versus 0.7 per 10,000 person years) 2.
c) In a cohort study drawing on data from 2004 to 2009, the risk of fatal overdose was significantly higher by 2.33 fold among patients using opioid analgesics who had a history of a benzodiazepine prescription, and higher by 3.86 fold among those with a current benzodiazepine prescription, when compared with patients using opioid analgesics who had no history of a benzodiazepine prescription. The risk of drug overdose deaths grew as daily benzodiazepine doses increased 2.
d) Observational studies have shown that using opioid analgesics together with benzodiazepines raises the risk of drug-related mortality relative to using opioid analgesics on their own. Given comparable pharmacological properties, it is reasonable to anticipate a similar risk when other CNS depressant drugs are used concurrently with opioid analgesics 34.
e) Instances of serotonin syndrome, a condition that can be life-threatening, have been reported when opioids are used together with serotonergic drugs 34.
Common questions
Can I take Acetaminophen And Codeine and Piritramide together?
Taking codeine and piritramide together stacks two opioids, raising the risk of heavy sedation and slowed breathing, so use only under close medical supervision with the lowest doses needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine and Piritramide 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 Acetaminophen And Codeine and Piritramide interaction managed?
Your care team can manage this combination safely. Typical steps include: Using the lowest effective dose of one or both opioids for the shortest time needed. Closer monitoring for excessive drowsiness, slowed or shallow breathing, and signs of serotonin syndrome (agitation, sweating, tremor, fast heart rate), especially when starting or changing doses. Possibly prescribing naloxone as an emergenc… 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 Acetaminophen And Codeine or Piritramide 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 (4)
- Product Information: CARISOPRODOL, ASPIRIN, CODEINE PHOSPHATE oral tablets, carisoprodol, aspirin, codeine phosphate oral tablets. Ingenus Pharmaceuticals LLC (per DailyMed), Orlando, FL, 2021. DailyMed
- US Food and Drug Administration (FDA): Drug Safety Communications: FDA warns about serious risks and death when combining opioid pain or cough medicines with benzodiazepines; requires its strongest warning. US Food and Drug Administration (FDA). Silver Spring, MD. 2016.
- Product Information: Codeine sulfate oral solution, codeine sulfate oral solution. Hikma Pharmaceuticals USA Inc(per FDA), Berkeley Heights, NJ, 2023. DailyMed
- Product Information: Codeine sulfate oral tablets, codeine sulfate oral tablets. Hikma Pharmaceuticals USA Inc. (per FDA), Berkeley Heights, NJ, 2023. DailyMed
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