Biotin Deficiency and Other Changes in Rats Given Sulfanilylguanidine or Succinyl Sulfathiazole in Purified Diets

The following pathological changes have been observed in rats given sulfaguanidine or sulfasuxidine in purified diets. 1. A granulocytopenia, leukopenia, hypocellularity of bone marrow and, occasionally, an anemia. 2. Hyalinization, necrosis and calcification of voluntary muscle. 3. Hyaline sclerosis and calcification of blood vessels. 4. A dermatitis which can be prevented or successfully treated with crystalline biotin. We have also observed necrosis of heart muscle, hemorrhage into various organs and subcutaneous tissues, and liver damage.