How long does Buspar stay in your system and what does it show up as? Is it a controlled substance?

Hi, Uncle! From the literature:
"It does not show up on a drug test. Technically speaking, buspirone should never show up on a drug test as a positive thing. It is always a negative result as far as buspirone is considered. But lately, many false positive cases have come into view and now this topic is under discussion. If it shows up on a drug test result as positive, then it would most probably show up as benzodiazepine. In most of the false positive cases and results, the substance which causes the false positive result is a benzodiazepine."

"Buspirone stays in the system for usually 18-24 hours. Buspirone is excreted up to 63% in 24 hours. It has a half-life of only a few hours. Due to its short half-life, this drug leaves the urine, blood, hair and saliva within 18-24 hours."

"CSA Schedule
Not a controlled drug"

https://www.drugs.com/buspirone.html

Hope this helps and answers your questions.