You may require a revision procedure for many reasons. It could be that your gastric band has slipped or eroded, or your gastric sleeve or stomach pouch has stretched so that the initial restriction provided by surgery is no longer effective.
Only a specialist bariatric surgeon can tell you whether you would be suitable for weight loss revision surgery. You will require some diagnostic tests prior to any revision procedure, which will be at a separate cost to the procedure itself, to determine why you aren’t losing weight or why you’re regaining it. These will include checking how food and liquid passes through your stomach, as well as understanding whether your stomach has stretched. Based on these tests, your surgeon can decide what the best way forward would be for you.