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Pharmacotherapy Case Study

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Pharmacotherapy
Step 1 - Very mild disease may be controlled with inhaled short-acting bronchodilator alone. These short acting agents include
There are two categories of antiasthma drugs: bronchodilators and anti-inflammatory agents. Bronchodilators reverse the bronchospasm of the immediate phase. While anti-inflammatory agents inhibit or prevent the inflammatory components of both phases. These two categories are not mutually exclusive: some drugs classified as bronchodilators also have some anti-inflammatory effect. The first step in treating the very mild disease may be controlled with short-acting bronchodilators, such as salbutamol or terbutaline alone. Salbutamol can be given by inhalation, so they can be delivered directly to the …show more content…

These drugs are given by inhalation, and the duration of action is normally 8–12 hours, but the lipophilic side-chains extend this duration of action up to 24 hours. They are not used ‘as needed’ but are given regularly, twice daily, as adjunctive therapy in patients whose asthma is inadequately controlled by glucocorticoids. They are used to prevent bronchospasm (e.g. at night or with exercise) in patients requiring long-term bronchodilator therapy. Although, prolonged use may lead to receptor desensitisation or down-regulation.
Step 4 - Consider theophylline and leukotriene antagonists, as they exert a glucocorticoid sparing effect, one or other is added for patients with more severe asthma and/or the dose of inhaled glucocorticoid increased to the maximum recommended.
Theophylline and leukotriene antagonists, such as Montelukast, also exert a corticosteroid-sparing effect, but this is less reliable. One or the other is added as the fourth step for patients who remain symptomatic and/or the dose of inhaled corticosteroid increased to the maximum recommended. Theophylline is often formulated as aminophylline and is a methyl xanthine, which inhibits phosphodiesterase and blocks adenosine receptors, but has a narrow therapeutic window with unwanted effects including cardiac dysrhythmia, seizures and gastrointestinal disturbances. The drug is given intravenously by slow infusion for status

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