Tapentadol
Opioids and antagonists
Opioids and antagonistsHigh alert
An error with this medicine can cause serious harm: double checks and protocols are used.
A strong opioid that also blocks noradrenaline reuptake. Used for severe acute pain; it carries all opioid risks plus serotonin syndrome.
Quick facts
- Group
- Opioids and antagonists
- Target
- μ-opioid receptor and noradrenaline transporter
- Key effects
- Nausea and vomiting · Dizziness · Somnolence
- Monitor
- Respiratory rate · Pain score
- ATC
- N02AX06
No doses: the clinician sets them by the current guideline.
Mechanism of action
The figure shows morphine in the μ receptor; tapentadol acts at the same site. There is no structure of tapentadol on a human target.
Tapentadol is a μ-opioid receptor agonist and a noradrenaline reuptake inhibitor in one molecule. The opioid effect reduces pain transmission and perception; the extra noradrenaline strengthens the descending pathways that inhibit pain in the spinal cord. It needs no metabolic activation.
- Activates μ-opioid receptors on pain pathways
- Also blocks noradrenaline reuptake in the spinal cord
- Both effects add up to analgesia
Indications
- Acute pain severe enough to need an opioid when other treatments are not enough
Adverse effects
Common
- Nausea and vomiting
- Dizziness
- Somnolence
- Constipation
Contraindications
- Significant respiratory depression
- Acute or severe asthma without monitoring or resuscitation equipment
- Known or suspected bowel obstruction, including paralytic ileus
- MAO inhibitors now or in the last 14 days
Key interactions
- Benzodiazepines, alcohol and other CNS depressants
- Additive sedation and respiratory depression, with risk of death
- SSRIs, SNRIs, tricyclics, triptans and other serotonergic drugs
- Serotonin syndrome
- MAO inhibitors
- Contraindicated together or within 14 days
What is monitored
- Respiratory rate, sedation level and oxygen saturation, above all at the start and after dose changes
- Pain score, bowel habit and signs of misuse
- Signs of serotonin syndrome (agitation, fever, tremor, clonus)
Administration and safety
- Controlled medicine (Schedule II in the United States): counted, stored locked and documented
- Oral tablets are swallowed whole; crushing or dissolving them for injection is dangerous
- Look-alike risk with other opioids of similar name: check the name and the formulation
Pregnancy and breastfeeding
Prolonged use in pregnancy can cause neonatal opioid withdrawal syndrome.
Nursing care
- Check breathing rate and sedation before each dose and hold the drug if the patient is hard to wake
- Keep naloxone available and know the local overdose protocol
- Start a bowel regimen and watch for urinary retention
- Teach safe storage away from children, no alcohol and no driving while drowsy
- Review antidepressants and other serotonergic drugs before the first dose
Pharmacokinetics
- Absorption
- About 32% bioavailable because of first-pass metabolism
- Metabolism
- Mainly glucuronidation; minor CYP2C9, CYP2C19 and CYP2D6 steps; no active metabolites
- Elimination
- Almost entirely by the kidneys
- Half-life
- About 4 hours
Test yourself
Think of the answer, then tap the question to see it.
Which two actions give tapentadol its analgesia?
μ-opioid agonism and noradrenaline reuptake inhibition.
Unlike tramadol, does tapentadol need a CYP2D6 metabolite to work?
No. It has no active metabolites; it is mainly glucuronidated.
Which drug class is contraindicated within 14 days?
MAO inhibitors.
Connections
← Back to the class: Opioids and antagonists
Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.
Sources: DailyMed - TAPENTADOL- tapentadol hydrochloride tablet, film coated (DailyMed (U.S. National Library of Medicine), 2026); ATCDDD - ATC/DDD Index (WHO Collaborating Centre for Drug Statistics Methodology, 2026).
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Representative model, for educational purposes only.