Is it possible to administer Nebbud, Eloprine forte, Aerius and Tretussin Med at the same time and what is the time interval between each medication?

There are no contraindications to administer these drugs during one therapy. Please note that Aerius and Nebbud are prescription medicines and should be given to your child as directed. Other preparations have a complementary effect. Always keep an interval of at least 20 minutes between your medications.
After inhaling Nebbud, rinse your mouth with water.

Eloprine forte has a supportive effect in immunocompromised people, in the case of recurrent upper respiratory tract infections.

Aerius is indicated for the relief of symptoms associated with allergic rhinitis.

Tretussin Med is a preparation that gives a feeling of hydration and brings relief to throat irritation. It relieves pain and inflammation of the throat.

Nebbud, on the other hand, is used in inflammation of the larynx.

Here you can compare the prices of Eloprine and Tretussin Med and order them to be delivered to your doorstep or picked up in a pharmacy:

https://www.gdziepolek.pl/produkty/92529/eloprine-forte-syrop/apteki

https://www.gdziepolek.pl/produkty/104752/tretussin-med-syrop/apteki

Here you can check the availability of Aerius and Nebbud and book it at the pharmacy: 

https://www.gdziepolek.pl/produkty/2593/aerius-plyn/apteki

https://www.gdziepolek.pl/produkty/52516/nebbud-zawiesina/apteki