In addition, the medication classes reviewed, include anticoagulation, angiotensin converting enzyme (ACE) inhibitors, angiotensin II receptor blockers (ARB), convalescent plasma, non-steroidal anti-inflammatory drugs (NSAIDs), human recombinant soluble ACE2, and the BNT162b2 mRNA COVID-19 vaccine. Here, ACE2 is linked to COVID-19.