Half life biological of oxytocin:
Oxytocin

It is a nonapeptide (Peptide of nine amino acids).
Released by posterior pituitary and synthesized in the supra optic and paraventricular nucleus of hypothalamus.
Half life 3–4 minutes.
Duration of action – 20 minutes.
Mechanism of action – Acts through calcium mediated channels to initiate myometrial contractions.
2-3 min
3-4 min
5-6 min
7-8 min