Can I combine Hydrocortisonum ointment with Clatra? If so, at what interval?

Yes, you can. There are no contraindications to the use of the drugs listed in the question at the same time. There is also no need to keep a time interval. Clatra should not be taken with fruit juices, especially grapefruit juice, as this reduces the effect of the medicine. The drug should be taken 1 hour before or 2 hours after meals. I enclose a link to the page where you can compare the prices of the preparations listed in the question and place an order with home delivery or collection at a selected stationary pharmacy: Hydrocortisonum 0.5% ointment: https://www.gdziepolek.pl/produkty/36797/hydrocortisonum-aflofarm-krem/apteki Clatra: https://www.gdziepolek.pl/produkty/10833/clatra-allergy-tabletki/apteki I enclose materials that may be interesting and information about the possibility of using teleconsultation: https://www.gdziepolek.pl/telekonsultacja https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba