Baxter International, which makes the brand of heparin associated with the problems, and buys supplies from the Chinese plant, announced that it was expanding a recall to include virtually all its heparin products...The Food and Drug Administration said the number of deaths possibly associated with the drug, made from pig intestines, had risen to 21 from 4. But it cautioned that many of those patients were already seriously ill and that the drug might not have caused their deaths...The F.D.A...had not concluded that the Chinese plant was responsible. The agency also said it was investigating two Chinese wholesalers...that supplied crude heparin to the Chinese plant, Changzhou SPL [part of Scientific Protein Laboratories], as well as those that sold raw ingredients to the consolidators...The adverse reactions have included decreased or low blood pressure and fast heart rate.