From what I've read, both are SSRI's, selective serotonin reuptake inhibitors and though they are similar chemically, they are different and not interchangeable. The example I saw was both hands looking similar but putting one on top of the other, showed the differences.
Lexapro, Escitalopram, is not available as a generic.
Celexa, is. Citalopram is it's generic.
Generics are usually cheaper than the name brands, but again, your doctor may see a need for one over the other.You should ask your doctor any questions you have about the differences between them and which is for your particular symptoms.
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