These lozenges are not candies, and this should be well understood by whoever will use them. Personally, I have mixed experiences that are difficult to describe in this limited space. Let me try, though:

I used them exactly as instructed (2 lozenges - once a day) for about 20 days. The result was that a strange dry sensation was created in my throat, specifically in the larynx, which reached up to the esophagus. I hadn't realized that it was coming from them because I already had some other issue (which is why I took them in the first place) and I was ready to undergo additional tests (note that I had already visited an ENT specialist and nothing pathological was detected).

And somewhere there, I contracted Covid, which I completely passed with mild cold symptoms. I note that apart from a slight congestion, I didn't have a sore throat or any of the other symptoms mentioned for Omicron, but that strange sensation somehow worsened. Of course, I can't say for sure that the lozenges helped, but all those who got infected with me had much worse symptoms. However, I immediately stopped taking them, and after a few days, my throat returned to normal without any strange symptoms anymore. Everything is fine then.

In conclusion now: I recommend using them with caution. If you really think you need them, take them for about 10 days, not more than two weeks. If you notice anything unusual in your throat, stop taking them immediately, and you will likely quickly return to normal.