Tramadol

# Tramadol ## Overview - **Classification**: Centrally acting synthetic opioid analgesic. - **Mechanism**: Weak $\mu$-opioid receptor agonist. Inhibits reuptake of norepinephrine and serotonin. ## Primary Indications 1. **Moderate to Moderately Severe Pain**: Management of acute or chronic pain. 2. **Neuropathic Pain**: Often used as an adjunct, though evidence varies. 3. **Restless Legs Syndrome (Off-label)**: For refractory symptoms. ## Adult Dosing ### Standard Dosing **Moderate to Moderately Severe Pain (Immediate Release, IR)** - **Dose**: **50 mg to 100 mg** - **Frequency**: Every 4 to 6 hours as needed (PRN) - **Route**: Oral (PO) - **Maximum**: **400 mg** per day (IR formulation) **Moderate to Moderately Severe Pain (Extended Release, ER)** - **Dose**: Start **100 mg** once daily (must be opioid-tolerant) - **Frequency**: Once daily (Q day) - **Route**: Oral (PO) - **Maximum**: **300 mg** per day (ER formulation) ### Dose Adjustments - **Renal Impairment (CrCl < 30 mL/min)**: IR Max **50-100 mg** $\mathbf{q12h}$. ER not recommended. - **Hepatic Impairment (Cirrhosis)**: IR Max **50 mg** $\mathbf{q12h}$. ER not recommended. - **Elderly Patients (Age > 75 years)**: IR Max $\mathbf{300 mg}$ per day. Initiate at low end of range. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: **Not recommended**. Safety and efficacy are not established. - **Special Notes**: Risk of serious respiratory depression and death. ### Infants (1-12 months) - **Dose**: **Not recommended** for pain management. - **Maximum**: Avoid use in this age group. ### Children (1-12 years) - **Dose**: **Contraindicated** for pain relief post-tonsillectomy/adenoidectomy. - **Dose**: **Generally not recommended**; increased risk of ultrarapid metabolism (CYP2D6 polymorphism). ### Adolescents (13-18 years) - **Dose**: Use Adult Dosing if **body weight $> 50$ kg**. - **Dose**: Must assess CYP2D6 status; generally avoid post-operative use. - **Maximum**: **400 mg** daily (IR). ## Safety Information ### Contraindications - **Absolute**: Acute alcohol, hypnotics, opioid, or psychotropic intoxication. - **Absolute**: Significant respiratory depression or acute bronchial asthma (unmonitored setting). - **Absolute**: Concurrent use or within 14 days of Monoamine Oxidase Inhibitors (MAOIs). - **Absolute**: Use in children $< 12$ years or $< 18$ years post-T&A (tonsillectomy/adenoidectomy). ### Common Adverse Effects - **Very Common (>10%)**: Nausea, Dizziness, Constipation, Headache. - **Common (1-10%)**: Somnolence, Vomiting, Pruritus, Dry mouth, Sweating. - **Serious but Rare**: Seizures, Serotonin Syndrome, Anaphylaxis, Respiratory Depression. ### Key Drug Interactions - **SSRIs/SNRIs/TCAs**: Increased risk of **Serotonin Syndrome** and seizures. - **CYP2D6 Inhibitors (e.g., Quinidine)**: Decreases active metabolite (M1); may reduce efficacy. - **CYP3A4 Inducers (e.g., Carbamazepine)**: Increases tramadol metabolism; decreased efficacy and increased side effects. - **CNS Depressants (e.g., Benzodiazepines, Alcohol)**: Profound sedation, respiratory depression, coma, or death. ## Monitoring & Follow-up - **Before Treatment**: Assess pain score, baseline mental status, complete drug interaction screen. - **During Treatment**: Monitor pain relief and sedation score (especially within first 24-48 hours). - **Clinical Signs**: Watch for agitation, hyperreflexia, tremor (Serotonin Syndrome signs), and persistent nausea/vomiting. ## Clinical Pearls - 💡 **Tip 1**: Titrate slowly to minimize Gl and CNS side effects (e.g., start **25 mg** daily and increase every 3 days). - 💡 **Tip 2**: Tramadol has a low seizure threshold; avoid in patients with uncontrolled epilepsy or history of generalized seizures. - 💡 **Tip 3**: Discontinuation requires gradual taper if taken > 2-3 weeks to avoid opioid withdrawal symptoms. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.