Prazepam and Acetaminophen And Codeine: 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
Prazepam
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.
These two medicines both slow down your brain and body. Your pain pill contains codeine, an opioid, plus acetaminophen (Tylenol). Prazepam is a benzodiazepine, a calming and anti-anxiety type of medicine. Taken together, they can make each other's slowing effects add up.
That can mean heavy drowsiness, low blood pressure, and slowed breathing. In serious cases, breathing can slow so much that it becomes dangerous. The good news is your care team can manage this by using the lowest doses needed and watching you closely. Never start, stop, or change either medicine on your own. Talk with your pharmacist or doctor, and get help right away if you feel very sleepy or short of breath.
Mechanism: additive CNS depression from combining an opioid (codeine) with a benzodiazepine (prazepam). No prodrug reversal applies here; effect is pharmacodynamic, not a metabolic prodrug issue.
- Direction/effect: increased risk of hypotension, respiratory depression, profound sedation, coma, and death.
- Evidence: theoretical, but severity rated major; onset unspecified.
- Management: reserve co-prescribing for when alternatives are inadequate. Use lowest effective doses and shortest duration. Monitor closely for sedation and respiratory depression. Consider prescribing naloxone for emergency overdose treatment.
Note the acetaminophen component does not drive this interaction but adds hepatotoxicity risk if dose limits are exceeded.
What happens
An increased risk of hypotension, respiratory depression, profound sedation, coma, and death
Interaction Deep Dive
Using codeine together with benzodiazepines may heighten the likelihood of respiratory depression, hypotension, profound sedation, coma, and death. Prescribing both drugs at the same time should be limited to patients in whom other treatment options prove inadequate. Keep doses and treatment durations to the lowest amount necessary. Monitor patients carefully for indications of sedation and respiratory depression. When such concurrent use is justified, consider providing naloxone as an emergency measure for treating opioid overdose134.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
The main goal is keeping both effects as small as possible. Your care team usually handles this combination by:
- Using the lowest doses of each medicine for the shortest time needed.
- Watching you closely for sedation, low blood pressure, or slowed breathing.
- Possibly prescribing naloxone to keep on hand for emergencies.
Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Ask your pharmacist or doctor whether an alternative is possible, and avoid alcohol or other sedating products. Seek emergency help right away for extreme drowsiness, confusion, or trouble breathing.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
4 reports — tap to read
a) In a study, emergency department visits related to nonmedical use that took place between 2004 and 2011 and involved opioid analgesics together with benzodiazepines rose significantly from 11 to 34.2 per 100,000. Drug overdose deaths attributable to prescribed doses and to doses exceeding those prescribed for both drug classes likewise rose significantly from 0.6 to 1.7 per 100,000, and overdose deaths due to benzodiazepines rose significantly from 18% to 31% 2.
b) In a prospective cohort study, the rate of overdose deaths involving the dispensing of both opioid analgesics and benzodiazepines was 10 times greater than that associated with dispensing of opioid analgesics alone (7 vs 0.7 per 10,000 person years) 2.
c) In a cohort study using data from 2004 to 2009, the risk of fatal overdose rose significantly by 2.33 fold in patients taking opioid analgesics who had a history of a benzodiazepine prescription and rose by 3.86 fold in those with a current benzodiazepine prescription, compared with patients taking opioid analgesics who had no history of a benzodiazepine prescription. The risk of drug overdose deaths grew as the daily dose of benzodiazepines increased 2.
d) Observational studies have shown that concurrent use of opioid analgesics and benzodiazepines raises the risk of drug-related mortality relative to use of opioid analgesics alone. Given comparable pharmacological properties, it is reasonable to anticipate a similar risk when other CNS depressant drugs are used concurrently with opioid analgesics 34.
Common questions
Can I take Prazepam and Acetaminophen And Codeine together?
Combining codeine with prazepam adds up their sedating effects and can dangerously slow breathing and lower blood pressure, so use both only when necessary at the lowest doses with close monitoring. Never adjust either medicine yourself; talk with your pharmacist or doctor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Prazepam 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 Prazepam and Acetaminophen And Codeine interaction managed?
The main goal is keeping both effects as small as possible. Your care team usually handles this combination by: Using the lowest doses of each medicine for the shortest time needed. Watching you closely for sedation, low blood pressure, or slowed breathing. Possibly prescribing naloxone to keep on hand for emergencies. Keep taking both exactly as prescribed unless your prescriber tells you otherwi… 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 Prazepam 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 (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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