Definition Oxytocin is structurally similar to anti-diuretic hormone (ADH, vasopressin) and both are released from the posterior pituitary. Onset is ~1 min when given IV, and t1/2 is ~5 min. The most common side effect is hypotension Prolonged infusions can result in water retention and hyponatremia due to cross reactivity with the vasopressin receptor, giving […]