Bioequivalence Study of Levocetirizine Dihydrochloride Tablets 5 mg Under Fasting Condition

Inclusion Criteria: 1. Male and non-pregnant female human subjects, age in the range of 18 - 45 years (both inclusive). 2. Body weight within ± 15% of ideal weight as related to height and body frame according to Life Insurance Corporation (LIC) Chart. 3. Subjects with normal findings as determined by baseline history, physical examination and vital signs (blood pressure, pulse rate, respiration rate and oral temperature). 4. Subjects with clinically acceptable findings as determined by haemogram, biochemistry, serology (HIV, Hepatitis B and Hepatitis C), urinalysis, 12 lead ECG and chest X-ray (chest X-ray if required). 5. Willingness to follow the protocol requirements as evidenced by written informed consent. 6. Confirming and agreeing to, not using any prescription and over the counter medications including vitamins and minerals for 14 days prior to study and during the course of the study. 7. No history of drug abuse in the past one year. 8. Non-smokers and non-alcoholics. 9. For female subject is child bearing potential practicing acceptable method of birth control for the duration of the study as judged by Investigator such as Condom, Foams, Jellies,Diaphragm, Intrauterine device and Abstinence. OR \- is surgically sterile (bilateral tubal ligation, bilateral oophorectomy or hysterectomy has been performed on the subject). Exclusion Criteria: 1. Known history of hypersensitivity to Levocetirizine or to Cetirizine, or related drugs. 2. Requiring medication for any ailment having enzyme-modifying activity in the previous 28 days, prior to dosing day. 3. Any medical or surgical conditions, which might significantly interfere with the functioning of gastrointestinal tract, blood-forming organs etc. 4. History of cardiovascular, renal, hepatic, ophthalmic, pulmonary, neurological, metabolic, hematological, gastrointestinal, endocrine, immunological or psychiatric diseases and bleeding tendency. 5. Participation in a clinical drug study or bioequivalence study within 90 days prior to present study. 6. History of malignancy or other serious diseases. 7. Refusal to abstain from food for at least ten (10.00) hours prior to study drug administration and for at least four (04.00) hours post-dose, in each study period. 8. Any contraindication to blood sampling or difficulty in accessibility of veins. 9. Refusal to abstain from fluid for at least 01.00 hour prior to study drug administration and for at least 01.00 additional hour post-dose, in each study period except about 240 mL of water given during administration of study drug. 10. Refusal to avoid the use of xanthine-containing food or beverages (chocolates,tea, coffee or cola drinks) or fruit juice/grapefruit juice and any alcoholic products for 48.00 hours prior to dosing until the last blood sample collection of last study period. 11. Blood donation within 90 days prior to the commencement of the study. 12. Subjects with positive HIV tests or Hepatitis-B or Hepatitis-C tests. 13. Found positive in breath alcohol test done before check-in for each study period. 14. Found positive in urine test for drugs of abuse done before check-in for each study period. 15. Refusal to abstain from consumption of tobacco products 24.00 hours prior to dosing until the last blood sample collection of last study period. 16. History of problem in swallowing Tablet(s). 17. Female subject, demonstrating positive urine pregnancy test at the time of screening. 18. Female subject, demonstrating positive Serum (ß) Beta- hCG (Human Chorionic Gonadotropin) test before check-in for each study period. 19. Female subject, currently breast feeding or lactating. 20. Female subjects not willing to use acceptable method of contraception from the date of screening until the completion of the study.