Willing and able to give informed consent for participation in the study. Willing to comply with all trial procedures. Symptoms of possible COVID-19 (any of fever, cough, change in taste/smell or other symptoms with a positive SARS-CoV-2 test). Onset of symptoms or a positive test for SARS-CoV-2 with symptoms of COVID-19 must be within the last 14 days. Patients aged ≥65 years. OR Patients aged ≥50–64 years with any of the following listed comorbidities:Known weakened immune system due to a serious illness or medication (eg, chemotherapy). Known heart disease and/or a diagnosis of high blood pressure. Known asthma or lung disease. Known diabetes. Known mild hepatic impairment. Known stroke or neurological problem. Self-report obesity or body mass index ≥35 kg/m2.
| Currently admitted in hospital. Almost recovered (generally much improved and symptoms now mild or almost absent). Judgement of the recruiting clinician deems ineligible. Patient already taking an intervention arm medication. Previous randomisation to an arm of the PRINCIPLE trial.
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