In addition to OT and to a lesser extent AVP (pitressin), a number of OT and AVP analogues; such as << carbetocin >> ([[ OT ]] agonist) dDAVP (desmopressin, V(2) agonist), terlipressin (V(1a) agonist), felypressin (V(1a) agonist) and atosiban (Tractocile OT antagonist) are also in clinical use.