Head to head
Oxytocin against Carbetocin (intranasal)
The hormone and the long-acting analogue taken into psychiatric trials. Both phase 3 trials of intranasal carbetocin in Prader-Willi syndrome missed their primary endpoint, the confirmatory trial returned a difference of 0.3 points on hyperphagia with P = 0.79 and a point estimate favouring placebo, and the extension was stopped for futility.
Column A
OxytocinOxytocin
A natural hormone that is FDA-approved for labor and is also studied, with mixed results, for social, bonding, and psychiatric effects.
Column B
Carbetocin (intranasal)Intranasal carbetocin, a long-acting oxytocin receptor agonist
A failed programme, reported as one. Both phase 3 trials in Prader-Willi syndrome missed their primary endpoint, the confirmatory trial returned a treatment difference of 0.3 points on hyperphagia with P = 0.79 and a point estimate favouring placebo, and the open-label extension was terminated by the sponsor for futility.
Side by side, on the facts we can check
| Attribute | Oxytocin | Carbetocin (intranasal) |
|---|---|---|
| Category | Hormone | Nootropic & CNS |
| FDA status | FDA-approved (Pitocin) for obstetric use; behavioral uses investigational | Not approved. An openFDA drug-label query for the generic name carbetocin returns no matches, consistent with no approved United States product. After the confirmatory phase 3 failure and the termination of the extension study, there is no active path to approval for the intranasal formulation. |
| Half-life | ~1-6 minutes | Longer than oxytocin, which is the stated design rationale for using this analogue rather than oxytocin. No specific human intranasal figure is asserted here because none was resolved in this pass. |
| Molecular weight | 1,007.2 Da | Not reported |
| Mechanism | Activates oxytocin receptors to stimulate uterine contraction and milk let-down, and modulates social and emotional processing in the brain. | The oxytocin receptor agonism is established pharmacology. Carbetocin binds the oxytocin receptor with greater selectivity and a longer duration than oxytocin, which is the whole point of the molecule. What was proposed rather than demonstrated is the step after that: that agonising the oxytocin receptor would reduce hyperphagia in Prader-Willi syndrome. Two adequately conducted phase 3 trials tested that proposition and it did not hold. The mechanism is intact; the clinical hypothesis built on it failed. |
| Human studies cited | 2 | 4 |
| Legal status, US | FDA-approved, prescription only | Investigational, not approved |
Frequently asked questions
What is the difference between Oxytocin and Carbetocin (intranasal)?
Oxytocin: A natural hormone that is FDA-approved for labor and is also studied, with mixed results, for social, bonding, and psychiatric effects. Carbetocin (intranasal): A failed programme, reported as one. Both phase 3 trials in Prader-Willi syndrome missed their primary endpoint, the confirmatory trial returned a treatment difference of 0.3 points on hyperphagia with P = 0.79 and a point estimate favouring placebo, and the open-label extension was terminated by the sponsor for futility.
Which has stronger research evidence, Oxytocin or Carbetocin (intranasal)?
This database does not grade compounds. It counts what was run in people: 2 of the 4 studies cited on the Oxytocin profile were human work, against 4 of 4 for Carbetocin (intranasal). Those counts are of our own citation lists and understate any larger literature, and neither is a recommendation.
Are Oxytocin and Carbetocin (intranasal) FDA-approved?
Oxytocin: FDA-approved (Pitocin) for obstetric use; behavioral uses investigational. Carbetocin (intranasal): Not approved. An openFDA drug-label query for the generic name carbetocin returns no matches, consistent with no approved United States product. After the confirmatory phase 3 failure and the termination of the extension study, there is no active path to approval for the intranasal formulation..
Reviewed Sep 2026. This page sets two published records side by side. It is educational, it is not medical advice, and it contains no dosing protocols or recommendations for personal use.