What kind of pills or treatment can somebody get for abdominal swelling?

WHOA. Get the cause of the swelling diagnosed and treated. Call your doctor now or latest tomorrow.
Abdominal swelling. The most common serious cause of abdominal swelling is cirrhosis of the liver which results in fluid retention in the abdominal cavity (ascites). Cirrhosis is most commonly caused by alcohol, but can be due to infections, clots, toxins. Treatment of the swelling in this case is with potent diuretics, but it remains critical to determine the cause. Allergic reactions and vasculitis also can do this.