Kiya, here are the figures in percentages. That might make it easier to see how similarly the two drugs decrease a person's score on the depression test:

Celexa (citalopram)
Decreased score by 20.3 pts/35.7 starting score = 56.9% decrease in depression

Lexapro (escitalopram)
Decreased score by 22.4 pts/36.3 starting score = 61.7% decrease in depression

See how similar the decrease is?

Perhaps a number of greater concern is that more people respond to Lexapro (76%) than to Celexa (61%). That is the number of people who see any decrease in depression. However, those figures are responders among all people, not responders to one drug among people already known to respond to the other drug. My guess is that people who respond to Lexapro are much more likely to respond to Celexa (you are part of this group) than are people for whom it is not known whether they respond to Lexapro. So that 61% figure is likely to be 90% or something for people like you who have done well on Lexapro. So I think it bodes well for you.

I too have a PNP, and mine has all sorts of resources at her disposal for determining drug equivalencies. She did that sort of calculation for me comparing dosages of Adderall to Vyvanse.

I will keep my fingers crossed for you on the Celexa so you can save some bucks. On my insurance plan, Lexapro costs $75/month and the equivalant amount Celexa costs about $5/month.