^^Yes....benzo's lose their effectiveness quickly. I used to have an rx for Xanax 1mg...90 with 2 refills a month. The first day they worked...then more are needed to feel the same way. Blacking out is a sketchy thing...
Once I took 1 1mg Xanax....I waited about 45mins to see how I was. I felt fine, lucid, etc. I walked to the store to get something to drink(a sugar-free Red Bull, not alcohol lol)...so, I walk in the store....that's the last thing I remembered. I woke up in the hospital.
Apparently, I was walking through the store opening danishes, taking a bite, and throwing them on the floor. About $40 worth ! O>M>G!!! I also had three pairs of sunglasses on my head with the price tag still on them!!
A "good samaratin" called the police. Thanks. The guy that worked at the store knew me, and was trying to talk me into going home to sleep-he knew I never was like that, and something was wrong. He wouldn't call the police on me....so, I got an on-site arrest for public intoxication. The judge dismissed it. Probably because I walked, not drove to the store.
Anyway, the point is, benzos are touchy. I don't take them anymore. And I didn't need that hassle of an onsite arrest etc. Just not worth it. I am on Neurontin, and it helps my anxiety/panic/depression a lot. For me-If I am going to take a benzo - I take Valium, about 30mgs, that relaxes me....I don't black-out on it...but it has to be taken occasionally. For sleep...or when I am very stressed. It's been a really long time since I've taken it.
Be careful mixing them with alcohol...that's all. Just be safe.

Don't trash a convenience store lol....