How to additionally protect the tablets from high temperature?

Alternatively, on the warmest days, you can help yourself with a special, styrofoam thermos or thermobox - they are better for longer storage than bags.

And is it possible to protect tablets against high temperature at home by any other means?

For @Werona2: Such a bag is rather used for short-term storage in a place where there are large temperature jumps. At home, it is usually enough to store tablets with the coolest place where sunlight does not reach.

Will such a heat-insulating bag with a string be effective for storing Daylette tablets at home when the temperature in the room exceeds 25 degrees in hot weather?

A styrofoam box is also suitable, but the bag is a bit more handy and takes up less space.

And you can, for example, store medicines in a steropian box or will such a heat-insulating bag be better?