Can I combine Gabapentin, Celekoxib, Telfast and Avamys? And is the occasional drink with these medications allowed?

According to current medical literature, there should be no adverse interactions between these preparations that are harmful to health or the effects of drugs. Due to the fact that all the drugs you are asking about are subject to prescription, therefore the legitimacy and need for their use in therapy is assessed by the doctor. These preparations should not be used. According to current medical literature, no direct effect of alcohol on the effectiveness and safety of the drugs listed in the question has been demonstrated. Moderate alcohol consumption during treatment is considered relatively safe. You can read more about combining drugs with alcohol in the text: https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-z-alkoholem I enclose additional information that may be helpful: https://www.gdziepolek.pl/artykuly/czy-przyjmowanie-kilku-lekow-jednoczesnie-jest-bezpieczne https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba