Comparative Pharmacology
Head-to-head clinical analysis: ACTONEL WITH CALCIUM COPACKAGED versus BONSITY.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ACTONEL WITH CALCIUM COPACKAGED versus BONSITY.
ACTONEL WITH CALCIUM (COPACKAGED) vs BONSITY
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
ACTONEL WITH CALCIUM (COPACKAGED) contains risedronate sodium, a bisphosphonate that inhibits osteoclast-mediated bone resorption by binding to hydroxyapatite crystals in bone and inhibiting farnesyl pyrophosphate synthase (FPPS), an enzyme in the mevalonate pathway. This leads to reduced bone turnover and increased bone mineral density. The calcium component is for supplementation to prevent hypocalcemia.
Selective estrogen receptor modulator (SERM); binds to estrogen receptors, exerting agonistic effects on bone and lipid metabolism and antagonistic effects on breast and uterine tissue.
Actonel (risedronate) 35 mg orally once weekly, taken with 6-8 oz of plain water at least 30 minutes before breakfast. Calcium supplement (e.g., 1250 mg calcium carbonate) taken with food at a different time of day.
10 mg orally once daily, taken with or without food.
None Documented
None Documented
Terminal elimination half-life of risedronate is approximately 20 hours for the 5 mg daily dose and 480 hours for the 35 mg weekly dose due to prolonged retention in bone; clinically, the drug accumulates in bone and is slowly released.
Terminal elimination half-life is approximately 24-30 hours; this supports once-daily dosing. Half-life may be prolonged in renal impairment.
Risedronate is eliminated primarily via renal excretion, with approximately 50% of an absorbed dose excreted unchanged in urine. Unabsorbed drug is eliminated in feces. Total clearance is about 100 mL/min.
Renal excretion of unchanged drug accounts for 60-70% of the administered dose; biliary/fecal elimination comprises 20-25% as metabolites and unchanged drug.
Category C
Category C
Bisphosphonate and Calcium Supplement
Bisphosphonate