A gall bladder attack can be stopped with Epsom Salts . Mix one tablespoon of epsom in a small glass of water. Drink it. If the attack does not stop in half an hour or 45 minutes the Epsom Salts can be repeated. If you take the Epsom Salts the second time expect diarrhea.
I do not know how long it would take a capsule to dissolve and then the epsom salts has to be digested. I would not mess around with a capsule if I was having a painful gall bladder attack.