Comparative Pharmacology
Head-to-head clinical analysis: FRAGMIN versus PANHEPRIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FRAGMIN versus PANHEPRIN.
FRAGMIN vs PANHEPRIN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Fragmin (dalteparin) is a low molecular weight heparin that binds to antithrombin III, potentiating its inhibition of factor Xa and, to a lesser extent, thrombin, thereby preventing thrombus formation.
Heparin binds to antithrombin III, causing a conformational change that accelerates the inactivation of thrombin (factor IIa) and activated factor X (factor Xa), thereby inhibiting blood coagulation.
Deep vein thrombosis prophylaxis: 2500 IU subcutaneously once daily, starting 1-2 hours before surgery and continuing postoperatively for 5-10 days or until ambulatory. Treatment of acute DVT: 200 IU/kg subcutaneously once daily, or 100 IU/kg twice daily. Unstable angina/NSTEMI: 120 IU/kg subcutaneously every 12 hours (max 10,000 IU per dose) with aspirin.
80 units/kg IV bolus followed by 18 units/kg/hour continuous IV infusion; adjust to maintain aPTT 1.5-2.5 times control.
None Documented
None Documented
2-4 hours (anti-Xa activity) after subcutaneous administration; prolonged in renal impairment (creatinine clearance <30 mL/min: up to 6-12 hours)
Terminal elimination half-life is dose-dependent: at standard IV doses (100 U/kg), mean t½ = 60 min (range 40–90 min); at high doses (400 U/kg), t½ increases to 150 min due to saturable clearance mechanisms. Clinical context: Short t½ necessitates continuous infusion or frequent subcutaneous dosing for sustained anticoagulation.
Primarily renal excretion (up to 70% as unchanged drug via glomerular filtration); minor biliary/fecal elimination (<15%)
Primarily renal excretion of metabolites (desulfated heparin) with a minor biliary/fecal component. Unchanged heparin is not excreted renally; clearance occurs via saturable hepatic metabolism and reticuloendothelial system uptake. Renal excretion accounts for approximately 50% of total clearance at therapeutic doses, while biliary/fecal elimination is <10%.
Category C
Category C
Anticoagulant
Anticoagulant