(R,R)-Reboxetine mesylate, an antidepressant agent, exhibits high bioavailability and is the (R,R) enantiomer of Reboxetine, a selective noradrenaline reuptake inhibitor. Contrasting its counterpart, the (S,S) enantiomer, this compound demonstrates low affinity for alpha-adrenergic and muscarinic receptors, alongside low toxicity in animals.