When i used phenibut, i didnt notice any effect from it until i used 2500mg at a time. Also just to compare my benzo dosages i use is mostly only 5mg of valium and occassionally 10mg, i alternate valium with either zolpidem or zopiclone and have been on these types of meds for last 10 yrs since having ME. I dont use these meds during the day for anxiety, i dont believe i have anxiety just severe insomnia. I also use other meds with benzo's for sleep like antihistamines and/or neurontin or lyrica etc plus sometimes herbal stuff. I just mention this so u can compare phenibut dosing with other benzo's, but i think its a trial and error as i have heard people feeling sleepy from 500mg of phenibut. Kava and withania are other natural options that may help with anxiety type symptoms. cheers!!