This is a study to investigate biomarkers after single oral doses of the anticoagulant agents dabigatran etexilate and rivaroxaban in healthy young male subjects and in healthy elderly subjects.

Inclusion criteria for non-hemophilia participants:

Panel A

- Male or female between 65 to 85 years of age

Panel B

- Male between 18 to 45 years of age

Both Panels

• Weight of ≥50 kg and ≤110 kg
• In good health
• No clinically significant abnormality on electrocardiogram (ECG)
• Nonsmoker and/or has not used nicotine or nicotine-containing products for at least approximately 6 months

Exclusion criteria for non-hemophilia participants:

• History of stroke, chronic seizures, or major neurological disorder
• History of clinically significant endocrine, gastrointestinal (including peptic ulcer disease), cardiovascular, hematological, hepatic, immunological, renal, respiratory, or genitourinary abnormalities or diseases
• History of malignant neoplastic disease, with the exception of adequately treated non-melanomatous skin carcinoma or other malignancies that have been successfully treated ≥10 years prior to the study
• History of a thrombotic or platelet-related disorder including prior deep venous thrombosis or pulmonary embolus
• Use of warfarin, coumadin, heparin, aspirin, dabigatran etexilate, rivaroxaban or dipyridamole within 2 weeks
• History of poor wound healing
• Unable to refrain from or anticipates the use of any medication, including aspirin and aspirin-containing products, all non-steroidal anti-inflammatory drug (NSAID)-containing products (including pain, cold and allergy products, etc.) and including prescription and non-prescription drugs or herbal remedies (such as St. John's Wort [Hypericum perforatum]) beginning approximately 2 weeks (or 5 half-lives) prior to initiation of the treatment periods, throughout the study until the post-study visit
• Consumption of excessive amounts of alcohol, defined as greater than 3 glasses of alcoholic beverages (1 glass is approximately equivalent to: beer [284 mL/10 ounces], wine [125 mL/4 ounces], or distilled spirits [25 mL/1 ounce]) per day
• Consumption of excessive amounts, defined as greater than 6 servings (1 serving is approximately equivalent to 120 mg of caffeine) of coffee, tea, cola, or other caffeinated beverages per day
• Major surgery, donation or loss of 1 unit of blood (approximately 500 mL) or participation in another investigational study within 4 weeks
• History of significant multiple and/or severe allergies (including latex allergy), or an anaphylactic reaction or significant intolerability to prescription or non-prescription drugs or food, including dabigatran etexilate and rivaroxaban
• Current regular user (including illicit drugs or has a history of drug [including alcohol] abuse within approximately 6 months
• History (including family history if hereditary) or symptoms of clinically relevant bleeding disorder
• Organic lesion at risk of bleeding (e.g., aneurysm, cavernous hemangioma, arterio-venous malformation)
• History of frequent epistaxis or has recurrent or active gingivitis or hemorrhoids

Inclusion criteria for hemophilia participants:

• Male with diagnosis of hemophilia B between 18 to 64 years of age
• Weight of ≥110 lbs and ≤300 lbs
• Has not received clotting factor in the 7 days prior to blood sampling
• No active bleeding event
• No procedure or surgery in the past 8 weeks
• Judged to be in good health based on medical history
• Has not smoked more than 2 cigarettes per day for at least approximately 1 week prior; has not smoked a pipe or cigar or chewed tobacco for at least 3 days prior
• Can refrain from the use of all NSAIDs (e.g., Advil, Aleve, aspirin), all NSAID-containing products (including pain, cold, and allergy products, etc.), herbal meds or drugs for 7 days prior to the date of study procedure

Exclusion criteria for hemophilia participants:

• Clinically significant endocrine, gastrointestinal (including peptic ulcer disease), cardiovascular, hematological (except factor IX deficiency), immunological, renal, respiratory, neurological or genitourinary abnormalities or diseases
• History of malignant neoplastic disease, with the exception of adequately treated non-melanomatous skin carcinoma or other malignancies that have been successfully treated ≥10 years prior to the study
• Consumption of excessive amounts of alcohol, defined as greater than 3 glasses of alcoholic beverages (1 glass is approximately equivalent to: beer [284 mL/10 ounces], wine [125 mL/4 ounces], or distilled spirits [25 mL/1 ounce]) within 24 hours prior to study procedures
• Major surgery, donation or loss of 1 unit of blood (approximately 500 mL) or participation in another investigational study within 7 days prior to the date of study procedures
• Current regular user (including illicit drugs or has a history of drug [including alcohol] abuse within approximately 6 months