What is the difference s-citalopram and r-citalopram?

S-citalopram and R-citalopram are enantiomers of the drug citalopram, which is commonly used as an antidepressant. S-citalopram is the more pharmacologically active form, primarily responsible for the medication's therapeutic effects in treating depression and anxiety. In contrast, R-citalopram is considered inactive and does not contribute significantly to the drug's efficacy. As a result, many formulations of citalopram focus on the S-enantiomer for treatment.