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If she has Crohn, she has already lost a lot of K, HCO3-, then the compensatory system wouldn't let her keep losing electrolytes in her urine.
Beta 2 agonists relax the uterus so this would be okay, right?
inhaled drugs do not have as much of systemic affect and B-agonists are used often in pregnancy for asthma control. SABAS are deemed safe but there are increased birth defects with long acting B-agonists.