About 14 years ago, my urologist prescribed me 1,000 mg Cipro daily for 3 weeks for a supposed prostatitis(slightly elevated PSA) for a 50-year-old man.
By day 10, I was experiencing significant anxiety issues (no previous issues, and I don’t think I am crazy :)). I immediately quit taking the stuff and continued to suffer significant sleep apnea/internal sleep clock issues (circadian rhythm) for 3 months afterwards. It really screwed my sleep patterns up badly.
Researching online, I found and participated in a voluntary CIPRO survey that some California medical school conducted, and as I researched the symptoms, the tendon tear issue came up quite frequently.
BTW, I am an Animal Science Professor and work in the beef industry. There used to be an animal health pharma called Bayer (they sold their animal-related suite of products about 7 or so years ago), and they had an animal antibiotic called Baytril. Baytril is Enrofloxacin, which is a close first cousin to Cipro (same family of Quinalones). Long story short, they conducted potential human use studies with it in an attempt to get approval for use. This effort was abandoned because it also caused human psychological issues as a side effect.
MFO
Baytril (enruofloxacin) is converted to ciprofloxacin in the animal bodies to some extent and in humans. Both entities can have antibacterial activity. Can both entities have toxicities also? Hard to prove in living creatures since by giving enro-, some cipro- is produced. . Maybe studies could be done in tissue culture where little metabolism might occur. Maybe the side effects noted in Baytril study was due to cipro- and enro-....?
I would guess the researchers felt it was not worth the effort to tease out which entity was the greater cause of the problems and why.
“for a supposed prostatitis(slightly elevated PSA)”
You must have had other symtoms?