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They're both antidepressants that sometimes people take for other things such as anxiety. They have the same active molecule. Celexa was made first. Then the makers of CeLEXA made LEXApro. Oooh they're so creative with names, lol.
The only difference between the two chemcially is this...
Think about your hands. They're exactly the same but also exact opposites, right? So your lefthand glove won't fit onto your right hand. Well Celexa's active molecule is just like your hands. Half of the molecules are shaped in one direction, and the other half in the other direction. Now picture all the receptors in your brain that it's supposed to bind up with as all left gloves. It's the extra right hands floating around in your system that causes some of the side effects of Celexa.
With Lexapro they took the active molecule in Celexa and got rid of the "right hands." So one, yes it's more potent. A lower dosage will do just as well as a higher dosage of Celexa. But there's also nothing left of the active molecule to cause side effects. There's still a risk of some, but much less than with Celexa.
Okay, that's all I got. Hope it's what you were looking for.
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- Lexpro is an isomer of celexa that has been seperated out to limit the potential CNS side effects.