Groom your cat. The more hair you can get off your cat by brushing him, the less he will swallow. Brush your cat regularly, then wipe your kitty down with a damp cloth to remove hairs missed by the brush.
Hairball products . If the problem still exists, you can also use petroleum-based products (such as Laxatone) that act as a laxative and lubricant to facilitate the passage of matted hair through the intestine. These products, which are pleasant tasting to cats, can be fed in paste form or applied to your cat's paws to allow your pet to lick it off.
Hairball remedy treats or food . You can also give your cat treats containing mineral oil to break up the hairballs, such as Pounce® hairball treatment. Some pet food companies now manufacture food for cats with recurrent hair or fur ball problems. Ask your veterinarian what she or he recommends.
In my experience, the FURminator is one of the best tools on the market today for removing hair and dander from your cat's undercoat. FURminator gets way down into your cat's fur, through the topcoat and into the undercoat, to remove loose hair and dander. And you will be AMAZED to see how much hair it actually removes.