Can I use Doxepin Teva 25mg, Efectin ER 75mg at the same time...

There should be no harmful interactions between the drugs mentioned by you. However, they can only be used if they have been prescribed by the same doctor or if the doctors prescribing these preparations have been informed about what other medicines the patient is already taking. Please take a break of several hours between their use. Please also pay attention to the interactions of the drugs used with food. Alcohol consumption should be avoided during therapy. Alcohol and the above drugs intensify each other's action and cause excessive drowsiness, speech disorders, weakening of concentration, dexterity and motor coordination. I also encourage you to read the article: https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-z-alkoholem