Side-by-Side Comparison · 2026

Daptomycin vs Protegrin-1

Daptomycin vs Protegrin-1 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Daptomycin
Antimicrobial Peptide

Daptomycin (Cubicin) is a cyclic lipopeptide antibiotic from Streptomyces roseosporus, FDA-approved in 2003. It has a novel mechanism of action distinct from all other approved antibiotics: calcium-dependent insertion into bacterial membranes followed by channel formation and rap...

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Protegrin-1
Antimicrobial Peptide

Protegrin-1 (PG-1) is an 18-residue cationic beta-hairpin antimicrobial peptide isolated from porcine leukocytes. It is stabilized by two intramolecular disulfide bonds that lock its hairpin conformation....

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Key Parameters
Parameter Daptomycin Protegrin-1
Category Antimicrobial Peptide Antimicrobial Peptide
Research FDA Approved Phase 3 / Clinical
Half-Life 8-9 hours Short
Typical Dose 4-6 mg/kg IV once daily (skin); 6-10 mg/kg IV once daily (bacteremia) 0.1-1 mg/mL (topical)
Frequency Once daily IV BID-TID
Route IV Topical / Oral rinse (research)
FDA Status Approved (MRSA skin, bacteremia, right-sided endocarditis, 2003) Phase 3 clinical evaluation (iseganan)

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Frequently Asked Questions
What is the difference between Daptomycin and Protegrin-1?
Daptomycin: Daptomycin (Cubicin) is a cyclic lipopeptide antibiotic from Streptomyces roseosporus, FDA-approved in 2003. It has a novel mechanism of action distinct from all other approved antibiotics: calcium-de... Protegrin-1: Protegrin-1 (PG-1) is an 18-residue cationic beta-hairpin antimicrobial peptide isolated from porcine leukocytes. It is stabilized by two intramolecular disulfide bonds that lock its hairpin conformat...
Which has a longer half-life, Daptomycin or Protegrin-1?
Daptomycin half-life: 8-9 hours. Protegrin-1 half-life: Short.
Can you stack Daptomycin and Protegrin-1?
Daptomycin and Protegrin-1 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.