Felypressin (Octapressin)

Prescription

Felypressin (also called Octapressin) is a synthetic analog of vasopressin used for a very specific job: as the vasoconstrictor component of some dental local anesthetic solutions. Local anesthetics for dentistry usually include a vasoconstrictor to keep the anesthetic concentrated at the injection site — this deepens and prolongs numbness and reduces bleeding in the surgical field. The most common vasoconstrictor is epinephrine (adrenaline), but felypressin offers a peptide-based, adrenaline-free alternative, most often paired with the local anesthetic prilocaine. Structurally felypressin is closely related to vasopressin but modified so that its main remaining action is vasoconstriction (via vascular V1 receptors) with minimal antidiuretic effect. Importantly, because it is not a catecholamine, it does not stimulate the heart the way epinephrine can. This makes felypressin-containing anesthetic attractive for patients in whom sympathetic stimulation from epinephrine is a concern, or where epinephrine is otherwise best minimized, and for situations favoring an adrenaline-free option. Its vasoconstriction is somewhat less intense than epinephrine's and is directed more at the venous side, so hemostasis (bleeding control) during a procedure is generally less pronounced than with epinephrine-containing solutions — a practical trade-off dentists weigh against its cardiovascular advantages. Felypressin is used in the EU, UK, Australia, Japan, and many other countries as part of combination dental anesthetic cartridges; it is not marketed in the United States. Because it is a vasopressin relative, caution is advised in pregnancy (V1 receptors are present on the uterus) and it is used according to standard dental prescribing limits. This page is an educational reference; dental anesthesia choices are made by the treating dentist based on the patient and the procedure.