I'll preface by saying I haven't made an academic level inquiry into how well it works or how exactly it works.
But it seems to be some protease inhibitor (anti virus reproduction) kinda like ritonavir which are well proven drugs, afaik there are already multiple on the market from different makers.
So purely from a mechanical perspective I don't think there's anything unsafe.
Now what is the catch, with such antiviral drugs, its that it is something you give to people who are very sick, so they have a chance to quicker recover. Or they may not recover at all. It is not anywhere near as effective as antibiotics is against bacteria.
The problem made by omicron is that people get fever for a few days, are unable to go to their jobs, so you have a big wave and it could cause temporary shut downs, like what happened mid December in China. Even if you distribute antiviral pills everywhere, it will not work.
Pfizer Inc. plans to stop enrollment in a study of its COVID-19 drug in patients who aren’t at high risk of severe disease after the pill didn’t help alleviate their symptoms, a major setback for broader use of the treatment.
The New York-based drugmaker said Tuesday that it would stop adding new participants to a highly anticipated study testing in a broader population of COVID patients who are at low risk of hospitalization and death. The decision comes after the study failed to demonstrate that the drug reduced COVID symptoms among relatively healthy patients and wasn’t able to show a statistically significant reduction in hospitalization and death.
Just because Paxlovid contains some anti-viral drugs, doesn't mean it is effective for treating covid. There are many sketchy things Pfizer do in their drug trials, I'm not even sure Paxlovid is really that effective for treating covid in high-risk patients, compared to other generic anti-virals or placebos.