Several clinical studies are currently under investigation which use RAAS-blocking drugs (BRACE-CORONA (NCT04364893)), gliptins (SIDIACO (NCT04365517); linagliptin trials NCT04371978 & NCT04341935) and SGLT2 inhibitors (DARE-19 (NCT04350593) in COVID-19 patients. This evidence concerns the gene SLC5A2 and COVID-19.