Tramadol

Brand Names: Tramal

Drug Class: Opioid Analgesic, Synthetic

Overview

Tramadol is a centrally-acting synthetic opioid analgesic used for management of moderate to severe pain when non-opioid alternatives are inadequate. It has dual mechanisms of action as a μ-opioid receptor agonist and serotonin/norepinephrine reuptake inhibitor. Due to risks of addiction, abuse, and respiratory depression, it should be reserved for patients where alternative treatments are insufficient.

Mechanism of Action

Tramadol exerts analgesic effects through two complementary mechanisms: (1) weak μ-opioid receptor agonism primarily via its active metabolite O-desmethyltramadol (M1), and (2) inhibition of neuronal reuptake of serotonin and norepinephrine, enhancing descending inhibitory pain pathways.

Indications

  • Management of moderate to severe pain in adults when non-opioid alternatives are inadequate
  • Pain severe enough to require an opioid analgesic

Common Doses

  • 50 mg
  • 100 mg

Dosage

Initial dose typically 50-100 mg every 4-6 hours as needed for pain, not to exceed 400 mg daily. Titrate slowly based on pain response and tolerability. For patients with renal or hepatic impairment, reduce dose and/or increase dosing interval.

Black Box Warning

Boxed Warning: Addiction, abuse, and misuse risk; life-threatening respiratory depression; accidental ingestion; neonatal opioid withdrawal syndrome; risks from concomitant use with benzodiazepines or other CNS depressants

Contraindications

  • Children younger than 12 years
  • Postoperative management in children younger than 18 years following tonsillectomy/adenoidectomy
  • Significant respiratory depression
  • Acute or severe bronchial asthma in unmonitored settings
  • Known or suspected gastrointestinal obstruction or paralytic ileus
  • Hypersensitivity to tramadol or other opioids
  • Concurrent use of MAOIs or within 14 days of discontinuation

Side Effects

  • Common: nausea, constipation, dizziness, somnolence, vomiting, pruritus, headache
  • Serious: respiratory depression, seizures, serotonin syndrome, adrenal insufficiency, severe hypotension, anaphylaxis, opioid withdrawal
  • Other: QT prolongation, hallucinations, confusion, urinary retention

Interactions

  • CYP2D6 inhibitors (quinidine, fluoxetine, paroxetine, bupropion): alter tramadol metabolism
  • CYP3A4 inhibitors (macrolides, azole antifungals, protease inhibitors): increase tramadol levels
  • CYP3A4 inducers (rifampin, carbamazepine, phenytoin): decrease tramadol efficacy
  • Benzodiazepines and other CNS depressants: additive respiratory depression and sedation
  • Serotonergic drugs (SSRIs, SNRIs, TCAs, triptans): increased serotonin syndrome risk
  • MAOIs: contraindicated within 14 days
  • Mixed agonist/antagonist opioids: reduced analgesia or withdrawal

Counseling Points

  • Take exactly as prescribed; do not increase dose or frequency without consulting provider
  • Avoid alcohol and other CNS depressants
  • Do not crush, chew, or break tablets
  • May cause dizziness/drowsiness; avoid driving or operating machinery until effects known
  • Store securely away from children and others
  • Dispose of unused medication properly
  • Seek immediate medical attention for difficulty breathing, extreme drowsiness, or seizures