Didn't Dad make a mistake if he's been taking Axtil, Dozox and Nebilenin at the same time for a year?

Such a drug combination is possible, as long as the doctor has so prescribed. It should be noted that these drugs will interact with each other in lowering blood pressure (especially at the beginning of therapy, the so-called "first dose effect" may occur). You should control the pressure to assess whether it is in the norm appropriate for age - it is best to encourage Dad to keep a diary. However, it is impossible to answer solely on the basis of your entry, whether in the case of your dad the given set is correct and optimal, what the dosage should look like and whether the patient did not make a mistake. Indications for the use of this drug kit should be verified with the doctor who deals with Dad - it can be a family doctor. I enclose additional information: https://www.gdziepolek.pl/kategorie/leki-na-nadcisnienie https://www.gdziepolek.pl/artykuly/czy-mozna-laczyc-leki-ze-soba