Isn't the amount of cold preparations taken too high? Do these drugs interact with each other?

There are no pharmacological interactions between these drugs, so there are no contraindications to their simultaneous use.

Just remember to keep a 20-minute interval between each tablet you take and always drink your medication with water.

At the same time, it is worth noting that the amount of preparations taken is actually large and can be slightly reduced, at least for the duration of antibiotic therapy. For the time being, I would give up supplementation with vitamin C, Iskial. Ibuprom can be used on an ad hoc basis in situations where the temperature exceeds 38 degrees.

It would be wise to use probiotic supplementation in the form of ready-made pharmacy preparations or increase the amount of pickles and kefir in the diet.

Here you can compare the prices of sample probiotic preparations and order them with home delivery or pick-up at the pharmacy:

https://www.gdziepolek.pl/produkty/27293/enterol-250-kapsulki/apteki

https://www.gdziepolek.pl/produkty/50697/multilac-synbiotyk-kapsulki/apteki

https://www.gdziepolek.pl/produkty/92543/loggic60-kapsulki/apteki

If the infection is accompanied by a runny nose, cough and sore throat, you should also take medication to relieve these symptoms. However, I would limit myself to one preparation for a sore throat and one for a cough.

Here, on the other hand, you can compare the prices of sample preparations for the mentioned symptoms and order them with home delivery or pick-up at the pharmacy:

for the throat:

https://www.gdziepolek.pl/produkty/80652/uniben-aerozol/apteki

https://www.gdziepolek.pl/produkty/57942/orofar-max-pastylki-lamelki-zelki/apteki

For dry cough:

https://www.gdziepolek.pl/produkty/92189/supremin-max-syrop/apteki

https://www.gdziepolek.pl/produkty/112021/unituss-junior-syrop/apteki

For a runny nose:

https://www.gdziepolek.pl/produkty/51588/nasic-aerozol/apteki

https://www.gdziepolek.pl/produkty/93525/xylometazolin-teva-aerozol/apteki

After the antibiotic therapy is over, you can return to prophylaxis.
Here is a link to sample preparations:

https://www.gdziepolek.pl/produkty/96179/iskial-max-czosnek-kapsulki/apteki

https://www.gdziepolek.pl/produkty/2326/ascorvita-tabletki-musujace/apteki