This study was conducted to investigate any potential reaction between losartan and hydrochlorothiazide.

Inclusion Criteria:

• At least 18 years old and not more than 45 healthy male volunteers
• Who had passed all the screening parameters

Exclusion Criteria:

• A clinically significant abnormal physical exam, medical history, or laboratory studies
• If they showed a sitting SBP of >140 or <100 mmHg, DBP > 90 or <60mm Hg, or a pulse rate of > 95 or < 50 beats/min at screening
• The use of any prescription drug within the previous month or use of any over-the-counter medication within the past 14 days
• A history of blood dyscrasias
• A history of alcohol or drug abuse within the past year
• Donation of blood during the 8 weeks prior to the study or plans to donate blood during or within 8 weeks of completing the study
• Unable to tolerate vein puncture and multiple blood samplings
• Any surgical/medical condition that might alter drug absorption, distribution, metabolism, or excretion