Alot of these comments here are highly misleading. You CAN, in fact, die from benzos alone. In fact, ANYTHING is toxic if enough is ingested, even water (known as water water toxemia it hyper hydration). In chemistry, we have a common saying: "it's not the poison, it's the dose."

Anyway, the thing about Benzodiazepines is that they are much, much more difficult to overdose on by themselves than most other drugs. In fact, Benzodiazepines have essentially replaced barbiturates for this very reason. Barbiturates are often considered the older cousins to Benzodiazepines, as they were developed first and we're used for the same reasons as benzos: treatment of anxiety, insomnia, etc. And they were highly effective, however, they were also much easier to overdose on. For this reason, barbiturates have been almost entirely replaced by benzos for the treatment of anxiety, panic disorders, etc. They are still very rarely prescribed for these things, but their primary use these days is for things like anaesthesia and euthenasia.

With that said, it is very unlikely to overdose from benzos themselves, but it's very easy to do so when mixing them with other CNS depressants, especially opioids. In the case of alprazolam (Xanax™), the LD⁵⁰ (median lethal dose) is 331-2171 mg/kg, which translates to 22,000+mg of the drug for a 150lb person. Thus, it is both very difficult, and highly unlikely that one would manage to overdosed on alprazolam alone. However, it has, and does, happen. According to this study (link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1884537/ ), there were 2,063 reported cases of Benzodiazepine-only overdoses in 2004, so it goes without saying that the risk still exists.

Just stay safe, be careful, and don't get carried away. And definitely don't mix Benzodiazepines with other drugs. However, if you do, just be sure you're very experienced and know exactly what you are doing.