So I've been prescribed alprazolam from generics to brand. I do have a high tolerance but I just my prescription filled and ended up getting mylan 1mg. Seems like they have zero affect on me. The script before this I got greenstones and they were just fine. But these mylans just suck and I'm pissed. Have zero affect on me. Has anyone else noticed this? Got them from walmart pharmacy. Someone please give me some input I'm very frustrated. Thanks.