It is a medication that is in the category of “steroids”. As a general rule of thumb, drugs that end in “sone” are steroids (for example prednisone, hydrocortisone). This is not a body building steroid (like testosterone) and instead acts to open up airways [making it easier to breath] and improves blood pressure [to help improve blood flow].
Preliminary results from a clinical trial have demonstrated that dexamethasone [pronounced dexuhmethazone] appears to be life-savingfor people who are hospitalized with COVID-19 and requiring oxygen [either via a nasal prongs, face mask, or a via ventilator]. This is terrific news. We are awaiting the final published report, but I very much trust these preliminary results.