False. They're absolutely given as a drug of first resort, all the time, in many places of the world. Happened to me.

In the US, in the early 2000s there was an anthrax terrorism scare where they tried giving thousands of people Cipro pre emptively.

They're a first resort for urologists, especially for people with any kind of prostate pain, even if there's no clear sign of infection.

At least in India, they are often given as first line treatments sometimes even when there is no infection prior to surgery to prevent infections later.

I've gotten these OTC at pharmacies in Southeast Asia, but didn't take them because I look up every medicine that I get.