As someone else posted, Voltaren is supposed to be applied by defined dosages and over time, not just when one wants it. But my husband is fine with minimal amount and only when absolutely needed. And that works for him. It is a personal choice.
But Voltaren can create liver problems. There are other side effects which I can't recall, but since my mother almost died from liver failure after a reaction to an often prescribed medication, I am supercautious. You can google Voltaren and read only from reputable sites/medical journals.