Boston (eCanadaNow) - The blood thinner drug Heparin has been put on hold by Baxter, as the multiple-dose vials were found to cause severe reactions in patients.

Patients were seen having severe reactions to the drug Heparin which include vomiting, dropping blood pressure to the point where they can go into shock, and more.

The FDA stated that they were going to review Heparin further.

There have been four reported deaths from Heparin in the multi-dose vials thus far.

The FDA stated that the only issues came with the high dose vials of Heparin.  The lower dose Heparin patients did not see nearly any of these bad reactions to the drug.

The FDA is "investigating whether similar events have been seen with other heparin manufacturers."