Atosiban (RW22164; RWJ22164) is indeed a nonapeptide and a competitive antagonist of the vasopressin and oxytocin receptors. It is structurally similar to oxytocin but lacks the amino group at the N-terminus, making it a desamino-oxytocin analogue. Atosiban is primarily used as a tocolytic agent, which means it helps to inhibit premature labor by blocking the action of oxytocin on the uterus. This makes it particularly valuable in the management of spontaneous preterm labor, as it can help delay delivery, providing critical time for administering corticosteroids to enhance fetal lung maturity or for transferring the mother to a facility with appropriate neonatal care.

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.