Yes, you can safely use both preparations at the same time, they do not interact with each other.

Check availability of Fanipos and make a reservation here:

https://www.gdziepolek.pl/produkty/29165/fanipos-krople-do-nosa/apteki

Here you can compare the prices of products in online pharmacies and place your order with home delivery or collection at the pharmacy:

https://www.gdziepolek.pl/produkty/115146/dr-max-sinutin-tabletki/apteki

In cities such as Warsaw, Wrocław, Łódź, Kraków, Katowice, Lublin, Poznań or Białystok, products can be ordered with instant delivery even in 1 hour thanks to the Wolt Drive service - here you can check if this service is available in your location:

https://www.gdziepolek.pl/koszyk/szybka-dostawa?src=zf

I also provide links to articles that may be useful:

https://www.gdziepolek.pl/artykuly/jak-stosowac-krople-do-nosa

https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba