“could that somehow negate any immunity deals from side effects that the Pharma companies have now?”
No. They have immunity granted by the federal government. A state law can’t override that.
“By Fla reclassifying this not as a medicine. But as a weapon. Might open the flood gates to suits against the manufacturers?”
No, again, federal law trumps state law. Been that way since Marbury v. Madison in 1803.
Demonstrable fraud would vitiate immunity.