DrugLib.com — Drug Information Portal

Rx drug information, pharmaceutical research, clinical trials, news, and more

A Pharmacodynamic Study of Dapoxetine Concomitantly Administered in Participants Taking Terazosin

Information source: Janssen Research & Development, LLC
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Ejaculation

Intervention: Treatment sequence 2 (Drug); Treatment sequence 1 (Drug)

Phase: Phase 1

Status: Completed

Sponsored by: Janssen Research & Development, LLC

Official(s) and/or principal investigator(s):
Janssen Research & Development, LLC C. Clinical Trial, Study Director, Affiliation: Janssen Research & Development, LLC


The purpose of this study is to assess the pharmacodynamics (the actions or effects a drug has on the body), pharmacokinetics (blood levels), safety, and tolerability of dapoxetine 60 mg when concomitantly administered in participants taking terazosin.

Clinical Details

Official title: A Randomized, Double-blind, Placebo-Controlled, Crossover Study Assessing the Pharmacodynamic Effects of Dapoxetine Concomitantly Administered in Subjects Taking Terazosin

Study design: Allocation: Randomized, Endpoint Classification: Pharmacokinetics/Dynamics Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Treatment

Primary outcome:

Difference between standing and supine blood pressure measurements

Difference between standing and supine blood pressure measurements

Secondary outcome:

Plasma concentrations of dapoxetine

Plasma concentrations of dapoxetine metabolite desmethyldapoxetine

Number and type of adverse events

Clinical laboratory test values

Physical examination findings

Vital sign measurements

Detailed description: This is a multiple-center, randomized (participants are assigned to study drug by chance), multiple-dose, double-blind (neither physician nor participant knows the treatment assigned), placebo (inactive substance that is compared with a drug to test whether the drug has a real effect in a clinical trial)-controlled, 2-period crossover (participants may receive different interventions sequentially during the trial) study to assess the pharmacodynamics, pharmacokinetics, safety, and tolerability of dapoxetine when concomitantly administered in adult male participants who have been on a stable dose of terazosin or doxazosin for at least 6 weeks. Study drugs used will be terazosin (a drug given for the treatment of hypertension and benign prostatic hyperplasia) and dapoxetine (a new drug being studied for the treatment of premature ejaculation). This study consists of a screening phase followed by a double-blind, placebo-controlled treatment phase consisting of 2 treatment periods. Participants will remain on their prescribed dose of terazosin and participants taking doxazosin will be converted to terazosin using the protocol-defined dose conversion (including assessment of control of urinary symptoms and risk for urinary retention). Participants will be administered concomitant (at the same time) dapoxetine or placebo once daily. Blood samples for pharmacodynamic and pharmacokinetic measurements will be collected at selected times during the study. Safety will be monitored. The total duration of study participation will be approximately 49 days. Participants will remain on their prescribed dose of terazosin (2 to 10 mg taken once daily by mouth) and will be administered daily by mouth concomitant dapoxetine 60 mg or placebo doses during 2 treatment periods (each 7 days in duration conducted in the study center). A period of up to 14 days will separate the treatment periods.


Minimum age: 18 Years. Maximum age: N/A. Gender(s): Male.


Inclusion Criteria:

- On a stable regimen of terazosin (2 to 10 mg) or doxazosin (2 to 8 mg) taken daily

for at least 6 weeks for the treatment of hypertension or benign prostatic hyperplasia

- a body mass index between 18 and 35 kg/m², inclusive

- a body weight of not less than 50 kg

- supine (laying down) blood pressure measurements between 90 and 150 mmHg, inclusive

- and, diastolic blood pressure measurements no higher than 95 mmHg.

Exclusion Criteria:

- History of current clinically significant illness or any other illness that the

investigator considers should exclude the study participant or that could interfere with the interpretation of study results

- symptomatic orthostatic hypotension (a decrease of >=20 mm Hg systolic blood pressure

measured after 2 but before 3 minutes after changing from supine (laying down) to standing position)

- taking a medication that is known to cause orthostatic hypotension, other than


- and, taking more than 2 other antihypertensive medications or taking an

antihypertensive medication that is excluded.

Locations and Contacts

Anniston, Alabama, United States

Tempe, Arizona, United States

Costa Mesa, California, United States

Miramar, Florida, United States

Knoxville, Tennessee, United States

Dallas, Texas, United States

Additional Information

A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Assessing the Pharmacodynamic Effects of Dapoxetine Concomitantly Administered in Subjects Taking Terazosin

Starting date: April 2011
Last updated: October 3, 2014

Page last updated: August 23, 2015

-- advertisement -- The American Red Cross
Home | About Us | Contact Us | Site usage policy | Privacy policy

All Rights reserved - Copyright DrugLib.com, 2006-2017