Formoterol differs from Salmeterol because Formoterol has:
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Correct answer: A faster onset of action
While both are LABAs, Formoterol has a rapid onset of action (1-3 minutes) similar to Albuterol, whereas Salmeterol takes 15-30 minutes. This allows Formoterol to be used for both maintenance and symptom relief in specific combination therapies.
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