A sorta weird one: I took five days of ciprofloxacin earlier this year for a killer sinus infection. It worked, but I noticed that my left Achilles tendon developed a new, unusually sharp pain when I stretched or pushed hard on the bike. I backed off on stressing it (probably avoiding serious damage), then googled on ciprofloxacin. Found out it, and the other related fluoroquinolone antibiotics have history re tendon damage.

Now it’s to the point where ABC News has done a story on it. There are a lot of other links if you Google on “antibiotic tendon”.

My Achilles seems OK now, but it took maybe three months of being careful before the soreness went away.