1. A method of treating idiopathic pulmonary fibrosis in a patient having probable usual interstitial pneumonitis as determined by a pattern on an image of the patient's lungs, wherein said method comprises perorally administering to said patient a therapeutically-effective amount of a sodium salt of N-butyloxycarbonyl-3-(4-imidazol-1-ylmethylphenyl)-5-iso-butyl-thiophene-2-sulfonamide, wherein said perorally administering is carried out after a minimum of two hours of fasting and fasting is continued for at least one hour after said perorally administering.
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