Comparative Pharmacology
Head-to-head clinical analysis: STADOL PRESERVATIVE FREE versus ULTRAM ER.
Peer-Reviewed Evidence
Head-to-head clinical analysis: STADOL PRESERVATIVE FREE versus ULTRAM ER.
STADOL PRESERVATIVE FREE vs ULTRAM ER
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Butorphanol is a synthetic agonist-antagonist opioid analgesic that exerts its effects primarily through binding to kappa-opioid receptors and, to a lesser extent, mu-opioid receptors, producing analgesia and sedation. It also has partial antagonist activity at mu receptors.
Tramadol is a centrally acting synthetic opioid analgesic that binds to μ-opioid receptors and inhibits serotonin and norepinephrine reuptake.
0.5–2 mg intravenously or intramuscularly every 3–4 hours as needed for pain. Alternatively, 1–2 mg as a single dose, may repeat in 30–60 minutes if needed.
100 mg orally once daily initially, titrate up to 100 mg twice daily as needed; maximum 200 mg/day.
None Documented
None Documented
Terminal elimination half-life is 2.5–3.3 hours in adults; prolonged to 4–6 hours in elderly or hepatic impairment.
The terminal elimination half-life of tramadol is approximately 6.3 hours (range 5-9 hours), while its active metabolite M1 has a half-life of about 7.4 hours. Clinically, this supports dosing every 24 hours for the extended-release formulation.
Primarily hepatic metabolism (glucuronidation) to inactive metabolites; renal excretion accounts for <5% unchanged drug. Approximately 70% of dose excreted in urine as metabolites, 20% in feces.
Renal excretion of tramadol and its metabolites accounts for approximately 90% of total elimination. About 10% is excreted unchanged, 30% as O-desmethyltramadol (M1), and the remainder as other minor metabolites. Biliary/fecal excretion is minimal (<10%).
Category C
Category C
Opioid Analgesic
Opioid Analgesic