If I drank Simulal during the day, will it not work?

You have acted contrary to the manufacturer's instructions. The drug will work, but probably weaker, because it will be removed from the body faster. The manufacturer recommends using the drug on an empty stomach (about 2-3 hours before a meal or 2-3 hours after a meal), preferably before going to bed and after emptying the bladder. I enclose a detailed description of the preparation you are asking about: https://www.gdziepolek.pl/produkty/31149/symural-granulat-do-wytworzenia-plynu/ulotka/170723 If you are concerned about the lack of action of the drug or the correctness of its use, it is best to talk to your doctor about it. It is difficult to assess this without knowing your medical records. If you are unable to get to your primary care doctor, the gdziepolek.pl service also allows you to obtain a teleconsultation with a doctor: https://www.gdziepolek.pl/telekonsultacja I also encourage you to read the article: https://www.gdziepolek.pl/artykuly/zakazenie-drog-moczowych