In fact, oxytocin has an anti-diuretic effect as well. Certainly you're
not likely to get 7-8 L of IV fluids as you would with an epidural, but
one of the precautions for use is to monitor for fluid overload: "observe
for...water intoxication, poor output, N/V, headache, hypotension..."
(Dickason, Maternal Infant Nursing Care p. 347). Dawn Kersula
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