Why does adderall (dextroamphetamine and racemic amphetamine) cause gas and bloating?

Maybe not Adderall (dextroamphetamine and racemic amphetamine): Feeling full of "gas" may reflect malabsorption of food (like gluten, lactose), intake of poorly digested food, or choosing foods known to promote gas (beans, fizzy drinks). Sometimes its more complicated--a stomach emptying too slowly, bacterial overgrowth syndrome, delayed intestinal function, partial obstruction from any cause, infection, rectum problems, and pelvic pathology outside the gut.