Treatments are described as follows:
Treatment A: Multiple oral YPL-001 80 mg doses (1 x 80 mg tablet + 1 x 1 YPL-001 80 mg matching placebo tablet) will be administered approximately every 12 hours under fasting conditions for 55 consecutive days. Only the morning dose will be administered on Day 56.
Treatment B: Multiple oral YPL-001 160 mg doses (2 x 80 mg tablets) will be administered approximately every 12 hours under fasting conditions for 55 consecutive days. Only the morning dose will be administered on Day 56.
Treatment C: Multiple oral matching placebo (2 x 1 YPL-001 80 mg matching placebo tablets) will be administered approximately every 12 hours under fasting conditions for 55 consecutive days. Only the morning dose will be administered on Day 56. In all treatments, one tiotropium (Spiriva® HandiHaler®) 18 μg capsule will also be administered QD every morning prior to study drugs administration. Albuterol will be administered on an as needed basis. Each dose of Treatments A, B and C will be administered orally with approximately 240 mL of water.
