Yes, I'm currently taking Celexa (Citalopram). Unfortunately, I'm taking it alongside other meds and so cannot reliably separate out its effects on their own. 20 mg daily seems to me a minimal initial/trial dose. Once you and your doctor have a sense for how you're doing with that initial dose, you might increase the dosage, add another drug, or switch medications.

Here's PsychCentral's Celexa Page.

Best wishes for good results!