This is a single-center, Phase I, healthy adult subject study with a randomized, double blind, three period, three-treatment, cross-over design.

Inclusion Criteria:

• Informed Consent Form (ICF) prior to any study related procedures
• Male and female subjects 18 to 55 years, inclusive
• Good general health
• Medically acceptable contraception for women of child-bearing potential and males with female partners of childbearing potential
• Clinical labs within normal ranges or determined to be not clinically significant by the Investigator

Exclusion Criteria:

• Pregnancy, nursing female subjects, or subjects trying to conceive
• Clinically significant neurologic, cardiovascular, hepatic, renal, endocrinologic, pulmonary, hematological, psychiatric, or other medical illness that would interfere with participation in this study
• History of ECG abnormalities
• Cancer not in complete remission for at least 5 years
• Clinically significant, symptomatic prostatic hypertrophy
• Male subjects with a trans-urethral resection of the prostate or full resection of the prostate within 6 months prior to Screening
• Clinically significant bladder neck obstruction or urinary retention
• Inadequately treated glaucoma
• History of an allergic reaction or hypersensitivity to any drug or to any component of the formulations used in this study
• Subjects with pre-existing anemia and/or iron deficiency