Hi, I just wanted to ad my experience on this drug. About a week and a half ago, I had to cold turkey after a 2 month binge. During this binge, I used a 30 ml nose spray and would take about 10 sniffs every hour or so. I did this for about 2 months until all my resources for it went dry for a week or so. It took me exactly 96 hours to complete the withdraw, and was 100% by day 5. I am very experienced in benzo and opiate withdraws, and I have had to withdraw from the RC benzos before and heroin at one point in my life. U-47700 was definitely one of the worst and most painful withdraws I have ever been through, but the worst of it lasted about 48 hours. This is after a 2 month binge. I prefer short but painful withdraws compared to benzo withdraws that last up to a year with post acute withdraws and rebound anxiety, its horrible to live like that for months and months, compared to U-4 where I just locked myself in my apartment for 72 hours. In short, U-4 withdraws, while very painful do not last long. Be prepared to feel like your body is overheating for about 48 hours, especially the first 12. The only remedy for this for me was constant warm baths/showers and jugs of cold bottled water to keep from dehydrating. I was sweating bullets so hard, I think I may have had a stroke if it weren't for the warm baths and constant hydration. Make it 48 hours and you are in the clear, at least I was. Hope this helps. Peace!