Why is there a shortage of drugs with mirtazapine in pharmacies at a dose of 45 mg?

Indeed, most products with mirtazapine at a dose of 45 mg are currently difficult to find in pharmacies. However, no official statements have been published on the causes of the accessibility problems. At the moment, the most widely available preparation with mirtazapine at a dose of 45 mg is Mirtor 45 mg, the availability of which is declared by 42% of pharmacies integrated into our system. Below I will stir a link to track the availability of the drug: https://www.gdziepolek.pl/produkty/49655/mirtor-tabletki-ulegajace-rozpadowi-w-jamie-ustnej/apteki