nounIntermediate
Definition
The time required for half of an administered peptide dose to be eliminated from the body.
Detailed Explanation
The time required for half of an administered peptide dose to be eliminated from the body. Most native peptides have extremely short half-lives: GLP-1 (~2 min), bradykinin (~15 sec), insulin (~5 min), oxytocin (~3–5 min). This rapid clearance — primarily through enzymatic degradation by proteases and renal filtration — is the central pharmacological challenge of peptide drug development. Solutions include acylation (semaglutide: ~7 days), PEGylation, D-amino acid substitution, cyclization, and depot formulations. A drug's dosing frequency is directly determined by its half-life.
Key Facts
- The time required for half of an administered peptide dose to be eliminated from the body.
- Most native peptides have extremely short half-lives: GLP-1 (~2 min), bradykinin (~15 sec), insulin (~5 min), oxytocin (~3–5 min).
- This rapid clearance — primarily through enzymatic degradation by proteases and renal filtration — is the central pharmacological challenge of peptide drug development.
- Solutions include acylation (semaglutide: ~7 days), PEGylation, D-amino acid substitution, cyclization, and depot formulations.
- A drug's dosing frequency is directly determined by its half-life.
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