Contraindicated in:
Use Cautiously in:
Derm: pruritus, sweating.
EENT: visual disturbances.
Endo: hypoglycemia.
F and E: hyponatremia.
GI: constipation, nausea, abdominal pain, anorexia, diarrhea, dry mouth, dyspepsia, flatulence, vomiting.
GU: ↓fertility, menopausal symptoms, urinary retention/frequency.
Neuro: dizziness, headache, somnolence, anxiety, confusion, coordination disturbance, euphoria, hypertonia, malaise, nervousness, SEIZURES, sleep disorder, stimulation, weakness.
Resp: RESPIRATORY DEPRESSION (INCLUDING CENTRAL SLEEP APNEA AND SLEEP-RELATED HYPOXEMIA).
Misc: physical dependence, psychological dependence, tolerance.
Drug-Drug:
Drug-Natural Products:
(Generic available)
Immediate Release
Renal Impairment
Hepatic Impairment
Extended Release
Therapeutic Classification: analgesics (centrally acting), opioid analgesics
Pharmacologic Classification: opioid agonists
Absorption: Immediate-release: 75% absorbed after oral administration; Extended-release: 8590% (compared with immediate-release).
Distribution: Crosses the placenta; enters breast milk.
Metabolism/Excretion: Mostly metabolized by the liver (primarily by the CYP2D6 and CYP3A4 isoenzymes); primarily metabolized by the CYP2D6 isoenzyme to active metabolite with analgesic activity (M1); CYP2D6 enzyme system exhibits genetic polymorphism; 7% of population may be poor metabolizers and may have significantly ↑ concentrations of tramadol and ↓ concentrations of M1 metabolite. 110% of Whites, 34% of Blacks, and 12% of East Asians may be CYP2D6 ultra-rapid metabolizers and have significantly ↑ concentrations of M1 metabolite. 30% eliminated unchanged in the urine.
Half-life: Tramadol (immediate release): 68 hr, Extended release: 7.9 hr; Active metabolite: 79 hr; both are ↑ in renal or hepatic impairment.
(analgesia)
ROUTE | ONSET | PEAK | DURATION |
---|---|---|---|
PO-immediate release | 1 hr | 23 hr | 46 hr |
PO-extended release | unknown | 12 hr | 24 hr |