How long after taking Clatra 20 mg can I take Hydroxyzine 10 mg?

At the outset, it should be noted that all the medicines mentioned in the question - Clatra and Hydroxyzinum, are only available with a prescription, so please follow your doctor's instructions.

These medicines do not have clinically relevant interactions with each other that would preclude their combined use. It is better to spread the use of the preparations over time so as not to overload the liver by metabolizing drugs at the same time. In this case, an interval of 15-30 minutes is sufficient.

I've included additional information that you may find helpful:

https://www.gdziepolek.pl/artykuly/czy-przyjmowanie-kilku-lekow-jednoczesnie-jest-bezpieczne

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