Pharmacokinetic Interactions of Valsartan and Hydrochlorothiazide (PKVH)


Damanhour University




Healthy Normotensive Participants


Drug: Hydrochlorothiazide
Drug: Valsartan
Drug: Valsartan/Hydrochlorothiazide

Study type


Funder types




Details and patient eligibility


This study was conducted to compare the rate and extent of absorption of valsartan and hydrochlorothiazide following oral administration as a fixed dose combination tablet and concomitant administration of the individual drugs under fasting conditions in healthy Egyptian subjects. The study was extended to investigate any potential reaction between VAL and HCT.

Full description

This study comprised 2 separate parts, I and II; each was a single-dose, open-label, 4-crossover periods separated by a 2 weeks washout, and 4-Treatments. Part I consisted of Treatments A (VAL 160 mg alone), B (HCT 12.5 mg alone), C (VAL 160 mg + HCT 12.5 mg) and D (VAL / HCT 160 mg/12.5mg) and Part II consisted of Treatments E (VAL 320 mg alone), F (HCT 25 mg alone), G (VAL 320 mg + HCT 25 mg) and H (VAL / HCT 320 mg/25 mg). Blood samples were collected up to 48 hours postdose and plasma was analyzed for VAL and HCT concentrations using HPLC. The pharmacokinetic properties of each drug after co-administration of VAL and HCT were compared with those of each drug administered alone.


24 patients




18 to 45 years old


Accepts Healthy Volunteers

Inclusion criteria

  • At least 18 years old and not more than 45 healthy male volunteers
  • Actual weight no more than ± 30% from ideal body weight based on sex, height, and body frame
  • Who had passed all the screening parameters
  • Free of any drug exposure known to interfere with the pharmacokinetics or assay of fexofenadine for at least 10 days prior to the study
  • Who had to be able to communicate effectively with study personnel, be literate, and able to give consent.

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
  • A history of serious intolerance, allergy, or sensitivity to fexofenadine
  • The use of any prescription drug within the previous month or use of any over-the-counter medication (with the exception of acetaminophen) 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
  • Cannot follow instructions, in the opinion of the investigator.

Trial design

24 participants in 4 patient groups

Valsartan 160 mg alone
Other group
Valsartan alone
Drug: Valsartan
Hydrochlorothiazide 12.5 mg alone
Other group
Hydrochlorothiazide alone
Drug: Hydrochlorothiazide
Valsartan160 mg + Hydrochlorothiazide12.5 mg
Other group
Concomitant administration of valsartan 160 mg + Hydrochlorothiazide 12.5 mg
Drug: Valsartan/Hydrochlorothiazide
Valsartan / Hydrochlorothiazide 160 mg/12.5mg
Other group
Fixed dose combination of valsartan 160 mg + Hydrochlorothiazide 12.5 mg
Drug: Valsartan/Hydrochlorothiazide

Trial contacts and locations



Data sourced from

Clinical trials

Find clinical trialsTrials by location
© Copyright 2024 Veeva Systems