DY- Among the variables I can think of combining to make children’s tylenol less chamur than I think you’re implying:
1. It’s [presumably] for a koton
2. There may be no tarfus
3. The tarfus may be botul
4. The tarfus may have been not rouy leachilas kelev at some point
5. Taking a bitter flavored syrup may not be derech achila (tylenol is nasty)
6. D’rabonnons may not apply b’makom refua, particularly in combination with “1.”
These may be boich svaros but I don’t think they are as irresponsible as categorically implying that tylenol should be kosher certified unless there’s great need.