I want to dissolve Theraflu in water, what temperature should it be?

According to Theraflu manufacturer:

"The contents of one sachet should be dissolved in 1 cup of hot water. Take orally as a hot drink."

The water should be hot, but not boiling. The contents of 1 sachet can be taken at a time, this dose can be repeated after 4-6 hours if further symptomatic treatment is necessary (with the contents of 3 sachets per day).

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

https://www.gdziepolek.pl/produkty/78418/theraflu-extra-grip-proszek-do-wytworzenia-plynu/apteki

https://www.gdziepolek.pl/produkty/78423/theraflu-zatoki-proszek-do-wytworzenia-plynu/apteki

https://www.gdziepolek.pl/produkty/78423/theraflu-zatoki-proszek-do-wytworzenia-plynu/apteki

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

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

Here you can consult a doctor (teleconsultation in Polish):

https://www.gdziepolek.pl/telekonsultacja

I recommend the following articles:

https://www.gdziepolek.pl/kategorie/leki-na-przeziebienie

https://www.gdziepolek.pl/artykuly/przeziebienie