Girls, hello. My eldest daughter is 1.9 years old and has trouble falling…

Girls, hello. My eldest daughter is 1.9 years old and has trouble falling asleep, wakes up crying. She wakes up 3-4 times a night, maybe even more. A neurologist prescribed Alleva. We've been taking it for two days now. I haven't noticed any improvements, on the contrary, she's become even more tearful and capricious. She hasn't slept better either. Has anyone given their children this drug, share your experience? Did you have something similar happen? Could it have a cumulative effect?