Started zyflo (zileuton) cr, nebuluzer pulmacort and albuterol 4 days ago. Peak flow still 60% of expected. How long should it take to improve?

See below. Your peak flow may not improve a whole lot. If you were having an exacerbation at the time you first did the peak flow and it was 60%, then it may improve. But if not, your looking to control symptoms, not necessarily get a good number on your peak flow.
2 weeks . You should discuss with your physician about risks and benefits of adding long acting beta agonists ( laba) to your regimen sounds like you may need it.

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