title: Histamine Receptor 1 and 2 Antagonists Alter Biodistribution of Radioiodine.
abstract: Nuclear medicine technology assumes responsibility for examination-specific patient preparation procedures. This requires a clear understanding of the possible effects of medications on the outcome of examinations. There is evidence that common over-the-counter drugs, histamine 1 (H1) and histamine 2 (H2) receptor blockers and proton pump inhibitors, may directly or indirectly affect thyroid function. The objective was to determine whether short-term use of these drugs alters biodistribution of radioiodine in a rat model.
  
  
  METHODS
  Rats received no drug (controls) or daily subcutaneous injections of H1 blocker (promethazine), H2 blocker (famotidine), or proton pump inhibitor (esomeprazole) commencing 1 d before a single intraperitoneal injection of 0.037 MBq (1 μCi) of (131)I (NaI) and continuing daily until euthanasia at either 1 d or 8 d after (131)I. Organ uptake of (131)I by control and drug-treated rats was compared by γ-well counting.
  
  
  RESULTS
  Promethazine significantly increased uptake of (131)I by the thyroid (drug-treated-to-control ratios) both at 1 d (1.32) and 8 d (1.52) after (131)I. Both famotidine and promethazine (respectively) significantly increased salivary gland uptake of (131)I (drug-treated-to-control ratios) at 1 d (1.37, 1.40) and 8 d (4.52, 5.57) after (131)I. Promethazine significantly increased gastric (131)I uptake (drug-treated-to-control ratios) at 1 d (1.47) and 8 d (1.46) after (131)I. Famotidine and promethazine (respectively) significantly decreased uptake of (131)I by the liver (drug-treated-to-control ratios) at 1 d (0.60, 0.71) after (131)I but resulted in a marked increase over control levels (11.21, 9.28) at 8 d. Blood levels of (131)I were not altered by drug treatment. Esomeprazole did not affect radioiodine distribution.
  
  
  CONCLUSIONS
  H1 and H2 blockers alter the biodistribution of radioiodine in the rat. Although the findings remain to be confirmed in humans, these drugs could increase radiation exposure to nontarget tissues, particularly the stomach and salivary tissue, during (131)I therapy and consideration should be given toward avoiding the elective use of these drugs during radioiodine therapy.
authors.affiliation: Department of Radiology, University of Utah, Salt Lake City, Utah; and.
authors.forename: Oliver
authors.initials: O
authors.lastname: Edwards
authors.affiliation: Intermountain Heart Center, Murray, Utah.
authors.forename: Ellen D
authors.initials: ED
authors.lastname: Yakish
authors.affiliation: Department of Radiology, University of Utah, Salt Lake City, Utah; and.
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Wang
authors.affiliation: Department of Radiology, University of Utah, Salt Lake City, Utah; and.
authors.forename: Qi
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Department of Radiology, University of Utah, Salt Lake City, Utah; and.
authors.forename: John M
authors.initials: JM
authors.lastname: Hoffman
authors.affiliation: Department of Radiology, University of Utah, Salt Lake City, Utah; and Kathryn.morton@hsc.utah.edu.
authors.forename: Kathryn A
authors.initials: KA
authors.lastname: Morton
mesh_terms: D000818:Animals; D004347:Drug Interactions; D064098:Esomeprazole / Q000008:administration & dosage; D015738:Famotidine / Q000008:administration & dosage; D005753:Gastric Mucosa / Q000378:metabolism*; D006633:Histamine Antagonists / Q000008:administration & dosage*; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics*; D008297:Male; D009928:Organ Specificity / Q000187:drug effects; D011398:Promethazine / Q000008:administration & dosage; D054328:Proton Pump Inhibitors / Q000008:administration & dosage*; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics*; D051381:Rats; D017207:Rats, Sprague-Dawley; D011969:Receptors, Histamine H1 / Q000187:drug effects; D011970:Receptors, Histamine H2 / Q000008:administration & dosage / Q000187:drug effects; D012469:Salivary Glands / Q000378:metabolism*; D013961:Thyroid Gland / Q000378:metabolism; D014018:Tissue Distribution / Q000187:drug effects
chemical_list: D006633:Histamine Antagonists; D007457:Iodine Radioisotopes; D054328:Proton Pump Inhibitors; D019275:Radiopharmaceuticals; D011969:Receptors, Histamine H1; D011970:Receptors, Histamine H2; D015738:Famotidine; D011398:Promethazine; D064098:Esomeprazole
keywords: 131I; biodistribution; drugs; gastritis; radioiodine; rat; sialadenitis; xerostomia