Who should not take Prena1 True?

The following conditions are contraindicated with this drug. Check with your physician if you have any of the following:


  • sarcoidosis
  • dehydration
  • constipation
  • decreased kidney function
  • increased activity of the parathyroid gland
  • high amount of calcium in the blood
  • kidney stones
  • tumor that dissolves bone
  • low amount of potassium in the blood
  • inflammation of the stomach called atrophic gastritis
  • Leber's hereditary optic atrophy
  • high amount of phosphate in the blood
  • excessive amount of vitamin D in the body
  • decreased blood-clotting from low vitamin K
  • increased risk of bleeding due to clotting disorder


  • Folic Acid Containing Drugs
  • Vitamin B
  • Docosahexaenoic Acid (DHA)
  • Fish Containing Products
  • Iron Complex
  • Iron Analogues
  • Ascorbic Acid (Vitamin C)
  • Potassium
  • Calcium
  • Niacin Preparations
  • Nicotinamide Analogues
  • Biotin
  • Copper
  • Riboflavin (Vitamin B-2)
  • Zinc
  • Cobalt
  • Isoniazid
  • Niacin
  • Ethionamide
  • Pyrazinamide
  • Vitamin B6 Preparations - Pyridoxine
  • Vitamin B1 Preparations - Thiamine
  • Vitamin D Analogue
  • Panthenol Analogues
  • Calcium Carbonate
  • Cobalamin And Derivatives
  • Vitamin E Analogues

Selected from data included with permission and copyrighted by First Databank, Inc. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.

CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.