History of poorly controlled asthma presents

  A 20-year-old woman with history of poorly controlled asthma presents to the A&E with severe shortness of breath and audible respiratory wheezing. She has normal blood pressure but she is pale. She uses terbutaline inhaler when needed but now the inhaler isn’t helping • What emergency drug should be administered? • Discuss: the indications, side-effects and mechanism of action of the proposed drug • What long-term therapy should follow, after she is stabilized? • Discuss: the indications, side-effects and mechanism of action of the proposed therapy for long-term management