[amorphous]

This covers your H2 antagonist drug.

Add Claritin-D and its generic to this side. I'm not too sure about some of the others listed.

This covers the PPI Drugs. (Proton Pump Inhibitors)

How do these help?

[Black Agnes]

loratadine/desloratadine is/are an H1 antagonist.

https://en.wikipedia.org/wiki/H2_antagonist

[BusterDog]

“How do these help?”

It is purported to head off a cytokine storm.