Both Celexa and Lexapro belong to the class of medicines called selective serotonin reuptake inhibitors (SSRIs) and are FDA approved to treat depression. The main differences between Celexa and Lexapro are: Celexa is a branded version of citalopram and Lexapro is a branded version of escitalopram Citalopram is a mixture of two stereo-isomers: R-citalopram and S-citalopram. Stereo-isomers are. Citalopram Oral Solution package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Compare Celexa head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Compare Bupropion vs Citalopram head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Compare Citalopram vs Fluoxetine head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Celexa (citalopram) is an antidepressant in a group of drugs called selective serotonin reuptake inhibitors (SSRIs). Includes Celexa side effects, interactions and indications. A major drug interaction exists between Celexa and Wellbutrin. View detailed information regarding this drug interaction. Learn about the side effects of Celexa (citalopram), from common to rare, for consumers and healthcare professionals. Celexa package insert / prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions and pharmacology. Información para el paciente sobre CeleXA: para qué sirve, dosis, efectos secundarios y cómo usar este medicamento.