Unfortunately Catlax has been discontinued however Catmalt is the new alternative. 
CatMalt® is a complementary feed for cats to aid in the
elimination of hair balls.
It also contains Cod liver oil and vitamin E to prevent fat soluble vitamin deficiency that can occur with extended use of laxatives.

To aid in the elimination of hair balls, CatMalt® contains malt and oils, which help the cat to get rid of the swallowed hairs by surrounding them with the combination of these natural ingredients and thereby making the hair digestible.
Key Benefits:
CatMalt® aids in the elimination of hair balls by combining malt extract and
liquid paraffin
Easy to administer
A creamy consistency facilitates application.
Natural ingredients. 
Can be used repeatedly.