Anyone tried lidocaine?

What the title says. My PT gave me a sample of some lidocaine to try for PIV (obviously I’m still going to appointments and stuff because this would be a bandaid not a solution) and I was wondering if anyone has tried it/had success using it? I put some on my arm to see if I had a reaction and it was fine but want to hear some of y’all’s thoughts before bringing it up with my boyfriend/trying to put it down there haha