Comparison
Octreotide vs. Oxytocin
Two peptides side-by-side — identity, evidence base, legal status and known adverse events.
Identity
Category
Research other
Research other
CAS no.
83150-76-9
50-56-6
Molecular weight
1019.24 g/mol
1007.19 g/mol
Half-life
1.7 h
0.05 h
Sequence
D-Phe-Cys-Phe-D-Trp-Lys-Thr-Cys-Thr(ol)Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2Mechanism of action
Octreotide
Octreotide is a cyclic octapeptide that selectively binds somatostatin-receptor subtypes SSTR2 and SSTR5. Via G-protein-coupled signalling, adenylyl cyclase is inhibited, reducing the secretion of multiple hormones (growth hormone, IGF-1, glucagon, insulin, VIP, serotonin). Structural stabilisation via a disulfide bridge and D-amino acids extends the half-life relative to natural somatostatin (minutes to several hours).
Oxytocin
Oxytocin is synthesised in the hypothalamus and released via the posterior pituitary. Peripherally it binds the oxytocin receptor, a G-protein-coupled receptor, and through the phospholipase-C cascade and calcium release triggers contraction of uterine smooth muscle and milk ejection — the pharmacological basis of the obstetric approval. Centrally, oxytocin acts as a neuromodulator and has been linked to social bonding, trust and modulation of stress and anxiety circuits. Its central effects in humans are mechanistically incompletely understood, particularly because it is unclear to what extent peripherally or intranasally administered oxytocin crosses the blood-brain barrier.
Evidence base
Highest evidence
Human RCT
Human RCT
Studies
5
4
of which in humans
4
4
Effects recorded
3
3
Open conflicts
1
1
Documented adverse events
2
0
Legal status
Full entries
Frequently asked questions
- What is the difference between Octreotide and Oxytocin?
- Octreotide is classified as "Research other", while Oxytocin is classified as "Research other". Octreotide: Synthetic octapeptide somatostatin analog with a longer half-life than endogenous somatostatin. FDA- and EMA-approved since the 1980s for acromegaly and neuroendocrine tumours. Oxytocin: Oxytocin is an endogenous nonapeptide hormone of the posterior pituitary. In synthetic form (Pitocin, Syntocinon) it has been approved for decades to induce and augment labour and to control postpartum uterine bleeding. Strictly separate from this is intranasal use to influence social behaviour, trust, anxiety or autism symptoms: this use is unapproved, purely experimental, and yields inconsistent and often negative results in controlled trials. This page contrasts both neutrally and source-based — with no usage or dosing recommendation.
- Which peptide is better supported by science, Octreotide or Oxytocin?
- The highest available evidence level is "Human RCT" for Octreotide and "Human RCT" for Oxytocin. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.
- What is the legal status of Octreotide and Oxytocin in Germany and the United States?
- Germany: Octreotide — Prescription, Oxytocin — Prescription. United States: Octreotide — Prescription, Oxytocin — Prescription. These are factual summaries with source and review date on the individual pages.