CQ6 成人喘息患者の長期管理において，中用量以上の吸入ステロイド薬（ICS）により 12 週間以上コントロール良好な場合に ICS の減量（ステップダウン）は

We conducted a systematic review to examine whether step-down of inhaled corticosteroid (ICS) is recommended for adult patients with asthma have been well controlled with moderate or high-dose inhaled corticosteroids for more than 12 weeks. Seven randomized controlled trials were included. ICS step-down did not increase asthma exacerbations requiring systemic steroid therapy and hospitalization. There was no effect on respiratory function, asthma control, or QOL. No significant differences were observed in serious adverse events or steroid-related adverse events, but the observation period was insufficient to assess long-term effects. Based on these results, we weakly recommend ICS step-down in adult patients with asthma have been well controlled with moderate or high-dose inhaled corticosteroids, but long-term asthma control and the incidence of steroid-related adverse events should be further investigated in the future.