Investigators will test the superiority of Superiority Trial of Fluticasone-Vilanterol as needed in mild asthma compared to standard of care

single centre randomised control trial with the aim of comparing the superiority of effectiveness and safety of fluticasone-vilanterol versus usual care. In this study there is random allocation of participants to usual care (Any ICS or SABA combination) or fluticasone-vilanterol daily single dose for the relief of symptoms.

Inclusion Criteria:

• Adults between the ages of 18 and 75 years old with a diagnosis of mild asthma attending the participating primary health care centres in Bahrain, being managed with usual care (SABA or ICS and SABA combination) and no other medications

Exclusion Criteria:

• Health centre medical record or self-reported use of LABA, leukotriene receptor agonist, theophylline, anticholinergic agent, oral corticosteroids for regular maintenance therapy in 3 months before entry to the trial. [NB. nasal corticosteroid is permitted](streamdown:incomplete-link)

Study documents (paper and electronic) will be retained in a secure (kept locked when not in use) location during and after the trial has finished. All essential documents including source documents will be retained for a period of 3 years after study completion (last patient, last visit). A label stating the date after which the documents can be destroyed will be placed on the inside front cover of the case notes of trial participants.Monitoring, audits, and REC review will be permitted and provide direct access to source data and documents. The Lead PI and the researcher assigned by her will have access to the stored data. Only the CRCs and Lead PI working on this study will be eligible to obtain the data from the participants during data collection visits.