- almost recovered (generally much improved and symptoms now mild or almost absent) - judgement of the recruiting clinician deems ineligible. - previous randomisation to an arm of the trial - pregnancy - breastfeeding - known severe hepatic impairment. - known severe renal impairment. - currently taking fluvoxamine, bromhexine, cyproheptadine, or niclosamide

- almost recovered (generally much improved and symptoms now mild or almost absent) - judgement of the recruiting clinician deems ineligible. - previous randomisation to an arm of the trial - pregnancy - breastfeeding - known severe hepatic impairment. - known severe renal impairment. - currently taking fluvoxamine, bromhexine, cyproheptadine, or niclosamide