Oxytocin nasal spray for lactation help?

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I am not getting much breast milk, 4 weeks pp and still getting 1-2 oz total when I pump. My obgyn prescribed Reglan (which is not helping) and recommended that I buy oxytocin nasal spray from Amazon... Said that the lactation consultants say it helps now days. So I bought it and then went to go read reviews, people are claiming that for the real oxytocin you need a prescription and this is just water? Wtf why would she suggest it in the first place. Anyone else taking it? Or tried it? Did anyone talk with a lactation specialist, what did they recommend? Thanks!