Can insomnia medications be ineffective?

The question is very general, so also in general it can be answered that drugs - including for insomnia - are not effective in every case. This may depend on the type of medicine, dose, dosage, cause of the problem and other factors, sometimes very individual. It is also worth noting that drugs based on natural raw materials, available without a prescription, may not work as strongly as synthetic drugs prescribed by a doctor. The cause of insomnia is also important - curing or removing the reason why the quality of sleep is not optimal can be a very important element of therapy. I enclose additional information that may be helpful: https://www.gdziepolek.pl/artykuly/bezsennosc https://www.gdziepolek.pl/kategorie/stres-i-bezsennosc