Bivalirudin

Overview

Bivalirudin (Angiomax) is a synthetic 20-amino acid bivalent direct thrombin inhibitor derived from hirudin, the natural anticoagulant peptide produced by the medicinal leech Hirudo medicinalis. Unlike heparin (which requires antithrombin cofactor), bivalirudin directly and reversibly inhibits both free circulating thrombin and clot-bound thrombin. FDA-approved for anticoagulation in percutaneous coronary intervention (PCI) and acute coronary syndromes, bivalirudin offers predictable pharmacokinetics, brief duration of action, and no requirement for laboratory monitoring in most settings.

Mechanism of Action

Bivalirudin contains two functional domains: a hirudin-derived C-terminal sequence that binds the fibrin-recognition (exosite 1) of thrombin, and a D-Phe-Pro-Arg-Pro N-terminal sequence that occupies the thrombin active site serine. This bivalent binding creates reversible direct thrombin inhibition. Unlike hirudin, after active site binding thrombin slowly cleaves the Arg3-Pro4 bond in bivalirudin, releasing the active site portion and producing transient self-inactivation that gives bivalirudin its characteristic short half-life (~25 minutes) and predictable anticoagulant offset.

Potential Benefits

• Direct thrombin inhibition without antithrombin cofactor requirement
• Inhibition of both free and clot-bound thrombin (advantage over heparin)
• Predictable pharmacokinetics and short half-life (~25 min)
• Reduced major bleeding compared to heparin+GP IIb/IIIa inhibitors in PCI
• Alternative anticoagulant in heparin-induced thrombocytopenia (HIT)

Research Dosage Notes

The following reflects doses used in published research studies. This is not medical advice.

PCI: 0.75 mg/kg IV bolus + 1.75 mg/kg/hr infusion during procedure. ACS: 0.1 mg/kg bolus + 0.25 mg/kg/hr infusion, then 1.75 mg/kg/hr during PCI.

Amino Acid Sequence

Side Effects & Safety

• Bleeding (primary risk; managed by dose adjustment and activated clotting time monitoring)
• Acute thrombosis with abrupt discontinuation
• Mild nausea
• Back pain

Synergistic Compounds

The following compounds have been studied alongside Bivalirudin for potential complementary or synergistic effects:

Related Peptides

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References & Further Reading

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