if your esophagus
has shrunk or has a "stricture" then you can develop difficulty swallowing. Your gastroenterologist can perform an esophageal "dilation" to open it up so you can swallow normally again, however this procedure might need to be repeated from time to time.
You may also have a motility problem in the esophagus where your muscles in the esophagus do not contract as well, and therefore gives you difficulty swallowing. There is a special test called manometry to evaluate this.
There is no medication to cure this.