I get leg cramps (and hand cramps). I use a product called Theraworx which I get on Amazon although I think they must have it in drugstores. It comes in different types of application. I like the foam. When I get a cramp, I rub the foam into the cramp twice. Usually, then the cramp goes away. Takes a few minutes to work totally. The cramp might return later. I use it again. Usually the cramping is at night, but sometimes it might happen if I've been sitting in a position with the knees bent. Good luck. It can be very painful.
I also take magnesium capsules, iron and calcium. I've been told that's the best combination of supplements for cramp reduction. And I eat 1/2 to one whole banana a day. I freeze some of the bananas so I don't have to visit the store more than once a week. Roz