I have had five cortisone shots in my left heel for Plantar Facitis (sp) heel spur. This was since last March and finally had to have the operation to remove it. YES, I had horrible leg cramps and calf cramps while watching TV in my recliner. I started taking potassium and Magnesium with Zinc to balance things out. It helped a lot. Now I have had two in the left foot for arthritis, one in the left knee and one in the left shoulder with physical therapy. Yes, the pains have gone away, but have severe cramps in shins, calf, legs, forearms, fingers lock up too. I now have a crick in my neck for three days. Just woke up with it. Took two teaspoons of yellow mustard (French's) for last leg cramp and applied heating pad. Seemed to help took two potassium before bed that night. Doctor's are either ignorant or refuse to acknowledge the problem. Good luck to all out there.
Potassium pills are only 3% of your daily requirement. So several of these will help. You would have to eat a stalk of bananas to equal one pill. lol Yes plenty of liquids, I also take a Calcium and magnesium gel tab. be careful with the Magnesium it will send you to the toilet. lol Check your other meds so you don't take too much potassium either. Some advise apple cider vinegar or mustard at time of the cramp also, google it.
I finally went to an orthopedic doctor that told me that that was a side effect for a lot of people when they have these injections. It is one of the more rare side effects. But it is a side effect from the injections.