The study is conducted as a randomized, non-blinded, 2-way crossover study. Target population
is 60 Japanese healthy male adult subjects selected by screening examination which will be
conducted within 4 weeks before the first drug administration of period 1 (before the
hospitalization of period 1). Subjects will admit in the clinical institute on Day -3 and be
discharged on Day 6 in each period. During hospitalization, standardized phosphate diet from
Day -2 to Day 4 will start approximately 20 minutes before dosing. Subject will take about
1300 mg of phosphate evenly at breakfast lunch and dinner for each day. Subject should
consume at least 95% of a meal. Distilled water not to include phosphate will be used for
drinking water and meal. Subjects are to drink at least 1 L of distilled water every day in
clinic to make sure enough urine volume. The 24 hours urine collection will be conducted
between Day -2 and Day 4 to investigate the urinary phosphate excretion.BAY77-1931 granule
500 mg or Fosrenol chewable tablet 500 mg will be administered three times daily after each
meal from Day 1 to Day 4. On day 4 single dose after breakfast will be administered. Study
drugs will be administered immediately after each meal, that is within 20 minutes after start
of each meal with 240 mL of distilled water. A Fosrenol chewable tablet 500 mg will be taken
after chewing completely.