I believe if you have the means to save someone and willfully withhold it, you're culpable for murder.
Pharmaceutical companies aren't going bankrupt if they can't charge thousands of dollars for a single dose. Common medications that are manufactured and sold in bulk subsidize the cost of medicines for rare conditions. They also enjoy patent benefits other industries don't get specifically to recouperate R&D costs.
Governments also can and do negotiate for lower drug costs, which is why medication is cheaper in Canada than the US.
Oh, and don't forget all the public funding pharmaceutical companies already get. Governments dumped tons of money into developing the covid vaccines and the companies made insane profits off of it.