Washington (CNN) - South Dakota Sen. Tim Johnson was hospitalized Sunday in Sioux Falls after what appears to have been a negative reaction to medication, his office announced Monday.
"The Senator is stable and doing well," Johnson's office said in a statement that noted his hospitalization was result of "a possible reaction to an antibiotic with a fever."
The 63-year-old Democrat, who was first elected in 1996, suffered a brain hemorrhage in December 2006 and did not return to the Senate until September of 2007. Dr. Scott Beckstrand, who is treating Johnson, said this hospitalization is not connected to the 2006 brain hemorrhage.
"Senator Johnson was admitted to Avera McKennan Hospital & University Health Center with a fever and is in stable condition. We are doing a full work-up to determine the cause but we suspect the cause could be a medical drug reaction, unrelated to the previous AVM," Beckstrand, Internal Medicine at Avera McKennan Hospital & University Health Center, said in the statement released by Johnson's office.
Johnson was easily re-elected to a third term in 2008.
"Trust me, I would rather be in Pierre today," Johnson said in the statement. "I'm glad to be back home in South Dakota and on the mend soon."