Side-by-Side Comparison · 2026

Polymyxin B vs Pyrrhocoricin

Polymyxin B vs Pyrrhocoricin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Polymyxin B
Antimicrobial Peptide

Polymyxin B is a cyclic lipopeptide antibiotic from Bacillus polymyxa that was approved in the 1960s and fell out of favor due to nephrotoxicity, but has experienced a major clinical resurgence as a last-resort treatment for carbapenem-resistant Gram-negative infections (Acinetob...

Calculate Polymyxin B dose →
Pyrrhocoricin
Antimicrobial Peptide

Pyrrhocoricin is a proline-rich antimicrobial peptide from the hemipteran insect Pyrrhocoris apterus (firebug). Unlike membrane-lytic AMPs, pyrrhocoricin exerts its effects by penetrating bacterial cells and interfering with intracellular targets, specifically the bacterial heat ...

Calculate Pyrrhocoricin dose →
Key Parameters
Parameter Polymyxin B Pyrrhocoricin
Category Antimicrobial Peptide Antimicrobial Peptide
Research FDA Approved Preclinical
Half-Life 6-8 hours Short
Typical Dose 15,000-25,000 units/kg/day IV N/A (research only)
Frequency Every 12 hours IV N/A
Route IV / IM / Topical / Intrathecal Systemic (research)
FDA Status Approved (systemic Gram-negative infections) Not approved

Calculate doses for both

Use ASCEND's free reconstitution calculator to get exact syringe draw amounts for your vial.

Calculate Polymyxin B Calculate Pyrrhocoricin
Frequently Asked Questions
What is the difference between Polymyxin B and Pyrrhocoricin?
Polymyxin B: Polymyxin B is a cyclic lipopeptide antibiotic from Bacillus polymyxa that was approved in the 1960s and fell out of favor due to nephrotoxicity, but has experienced a major clinical resurgence as a l... Pyrrhocoricin: Pyrrhocoricin is a proline-rich antimicrobial peptide from the hemipteran insect Pyrrhocoris apterus (firebug). Unlike membrane-lytic AMPs, pyrrhocoricin exerts its effects by penetrating bacterial ce...
Which has a longer half-life, Polymyxin B or Pyrrhocoricin?
Polymyxin B half-life: 6-8 hours. Pyrrhocoricin half-life: Short.
Can you stack Polymyxin B and Pyrrhocoricin?
Polymyxin B and Pyrrhocoricin are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.