Which of the following is a $\beta$-agonist formulation that is a single isomer approved by the U.S.Food and Drug Administration (FDA)for aerosol delivery?

Question

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Although epinephrine and albuterol have $\beta$-agonist effects,they are both racemic mixtures.Tiotropium is a parasympathomimetic drug.Levalbuterol is the FDA-approved single-isomer formulation of a F1F1F1S1?F1F1F10-agonist drug.

Which of the Following Is A β\betaβ -Agonist Formulation That Is a Single Isomer Approved by the Is

Which of the Following Is A $\beta$ -Agonist Formulation That Is a Single Isomer Approved by the Is