Comparative Pharmacology
Head-to-head clinical analysis: PROMETHAZINE versus TAVIST.
Peer-Reviewed Evidence
Head-to-head clinical analysis: PROMETHAZINE versus TAVIST.
PROMETHAZINE vs TAVIST
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Promethazine is a phenothiazine derivative that acts as a potent histamine H1 receptor antagonist, thereby blocking the effects of histamine. It also has central anticholinergic, antiemetic, and sedative properties, likely mediated through antagonism at muscarinic, dopamine D2, and serotonin receptors in the brain.
Antihistamine; selective inverse agonist at histamine H1 receptors, blocking histamine-mediated allergic and inflammatory responses.
12.5-25 mg IM or IV every 4-6 hours; also 25 mg PO or PR every 6-8 hours. Maximum 100 mg/day.
1.34 mg orally twice daily; maximum 8.04 mg/day.
None Documented
None Documented
Terminal elimination half-life 9-16 hours; may be prolonged in hepatic impairment.
Clinical Note
moderatePromethazine + Risedronic acid
"Promethazine can cause an increase in the absorption of Risedronic acid resulting in an increased serum concentration and potentially a worsening of adverse effects."
Clinical Note
moderatePromethazine + Methylphenidate
"Promethazine can cause an increase in the absorption of Methylphenidate resulting in an increased serum concentration and potentially a worsening of adverse effects."
Clinical Note
moderatePromethazine + Artesunate
"The serum concentration of Artesunate can be increased when it is combined with Promethazine."
Clinical Note
moderateTerminal elimination half-life is 12-15 hours in healthy adults; prolonged in renal/hepatic impairment.
Renal (70-80% as metabolites, <1% unchanged); biliary/fecal minor.
Renal excretion of metabolites (approx. 60%) and unchanged drug (<5%); biliary/fecal elimination accounts for about 40%.
Category A/B
Category C
Antihistamine / Antiemetic
Antihistamine
Promethazine + Clotrimazole
"The metabolism of Clotrimazole can be decreased when combined with Promethazine."