There's no medicine or anything you can give your cat for vomiting and all you can really do for a cat that is vomiting is to first remove any food from the cats bowl etc and put it away for 14 to 24 hours so that the cat doesn't try to eat anymore food.
This will allow the cats stomach to settle down and empty there stomach out.
After 24 hours feed the cat a mixture of small quantities of boiled chicken breasts, skinned and boned, with rice (50:50 mixture) and then if the cat is able to keep that food down you can switch back to the regular food diet for the cat.
If the cat continues to vomit or the cats blood contains vomit then it could be something more serious and the cat should be seen by a vet.