This is why, if I was the Emperor of the Universe, I would make it the law that if you want children, you must spend a year teaching 4-11 year olds! Some days it’s like trying to stuff fog in a bag (and that’s just the admin)!
It is not the responsibility of the school to ensure antibiotics are given to a child at lunch time. Likewise, it is unreasonable to suggest a 7 year old should remind a staff member to be given their medication.
It isn’t equivalent to giving a child insulin/epi pens. They will have particular members of staff who are then trained to give these meds, or, in the case of the diabetic children I’ve taught (before CHMs and pumps), there was training & a medical health plan (still happens today reading current teacher posts). Sometimes, a parent would go to the school, take the glucose reading, calculate dose, administer & wander off to pick up later. With epi pens, they’re not all the same, so the staff member would have to be instructed on each and every brand they had to keep & possibly use at school.
There is no longer anything like a School Nurse that lurks in a broom cupboard with a camp bed and a box of plasters. Most staff multitask & are incredibly busy. What you deem to be a Very Important Thing is not what the staff would consider to be a Very Important Thing.
And that’s without the ballache if the antibiotics need refrigeration!
If you want the child to have a dose at lunchtime, the best course of action is to get someone to deliver the meds to the school at lunch, go to the office, get the staff to find the child, administer the antibiotics, and take the bottle home so that they can have their after school dose as usual.
Or give a dose at breakfast, after school, at bed time and set an alarm for a night time dose (wake, pop dose in, tuck back in to sleep). It’s only for a few days after all.
The only unreasonable one isn’t the child, or the teacher. It’s wholly the parent’s responsibility to make sure a child has their antibiotics. Or does their homework, or spellings, or reading, or toilet training or…
And that’s also why so many teachers leave the profession (and I left before there were sites like Mumsnet where parents could write a character assassination because the universe fails to revolve around their Perfect First Born).