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Gramicidin S
Overview
Gramicidin S is a cyclic decapeptide antibiotic isolated from Bacillus brevis, consisting of two identical pentapeptide sequences joined in a ring structure. The peptide exerts antimicrobial activity by disrupting bacterial cell membrane integrity through interaction with phospholipid bilayers, leading to leakage of cellular contents.
Mechanism of Action
Its amphipathic beta-sheet conformation enables selective insertion into bacterial membranes. The compound demonstrates broad-spectrum activity against both Gram-positive and Gram-negative organisms.
Research Summary & Key Findings
Gramicidin S has been used primarily as a topical antimicrobial agent in certain countries, particularly in the former Soviet Union, but is not FDA approved for systemic use due to hemolytic toxicity and nephrotoxicity. In vitro studies have confirmed potent activity against multidrug-resistant bacteria, including Pseudomonas aeruginosa and Staphylococcus aureus. Current research focuses on structural analogs with improved therapeutic indices for potential topical or surface decontamination applications.
Clinical Status
Gramicidin S is in the investigational stage. While preclinical and early-phase data exist, it has not received regulatory approval for clinical use in the United States.
Administration Routes
References
Primary literature
- PubMed: "Gramicidin S"
Peer-reviewed literature indexed by the National Library of Medicine.
- ClinicalTrials.gov: "Gramicidin S"
Registered interventional and observational studies, including status and phase.
- PubChem: "Gramicidin S"
Chemical structure, molecular properties, and bioactivity data.
Study-level citations for this compound are being verified against the primary sources before publication. The database queries above return the current indexed literature in the meantime.
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View detailsNo lawful pathway today
Gramicidin S is not FDA-approved and does not currently have a lawful prescription or compounding pathway in the United States, so there is nothing for us to sell you here and no consultation to book. That can change: eight peptides moved back to a lawful pathway in February 2026.
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One email, only if this compound's regulatory standing actually moves. Not a newsletter, not a sales sequence.
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List Your PracticeDisclaimer: This information is provided for educational and research purposes only. It is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any peptide therapy. The Peptide Association does not endorse or recommend any specific treatment protocol. See our editorial policy for how this content is produced and reviewed.