A Study to Compare the Bioavailability of 300 mg Trazodone Hydrochloride Extended-release Caplets and 100 mg Trazodone Hydrochloride Immediate-release Tablets at Steady State
Condition: Healthy Subjects; Bioavailability; Pharmacokinetics
Intervention: Trazodone HCl; Trazodone HCl
Intervention description: Dosage form:
Extended-release caplets containing 300 mg trazodone HCl and extended-release caplets containing 150 mg trazodone HCl (the 150 mg dosage form was only used for the up and down titration, and was not evaluated in the study).
Dose regimen:
75 mg trazodone HCl (½ x 150 mg extended-release caplet) on Days 1 and 11, 150 mg trazodone HCl (one extended-release caplet) on Days 2 and 10, 300 mg trazodone HCl (one extended-release caplet) on Days 3 to 9, each at 23:30 after a fast of at least 4 hours.; Dosage form:
Immediate-release tablet containing 100 mg trazodone HCl
Dose regimen:
100 mg trazodone HCl (one immediate-release tablet) once (at 23:30) on Days 1 and 11, 100 mg trazodone HCl (one immediate-release tablet) twice (at 23:30 and 11:30) on Days 2 and 10, 100 mg trazodone HCl (one immediate-release tablet) three times daily (at 23:30, 07:30 and 15:30) on Days 3 to 9. Evening doses were administered after a fast of at least 4 hours.
Intervention MeSH terms: Trazodone
Phase: Phase 1
Study type: Interventional
Primary purpose: Treatment
Allocation: Randomized
Intervention model: Crossover Assignment
Masking: None (Open Label)
Enrollment: 30.0
Sex: All
Minimum age: 18 Years
Maximum age: 55 Years
Healthy volunteers: Accepts Healthy Volunteers
Keywords: Healthy subjects; Bioavailability; Pharmacokinetics; Trazodone; Steady-state

Summary:

      The purpose of this study was to compare the pharmacokinetic profiles at steady state of the
      test product, 300 mg trazodone hydrochloride (HCl) extended-release caplets (containing
      Contramid®), when administered once daily, and the reference product, 100 mg trazodone HCl
      immediate-release tablets (Apotex Corp.), when administered three times daily, for one week.
      For this purpose, the rate and extent of absorption of trazodone and formation of
      m-chlorophenylpiperazine (mCPP) after administration of multiple doses of up to 300 mg of
      each of the two formulations was compared.
    

Eligibility criteria:

        Inclusion Criteria:

          -  Healthy male and female subjects 18 to <56 years of age.

          -  Body mass within 10% of ideal mass in relation to height and age, according to Body
             Mass Index.

          -  Body mass not less than 60 kg.

          -  Findings within the range of clinical acceptability in medical history and physical
             examination, and laboratory results within the reference ranges for the relevant
             laboratory tests (unless the investigator considered the deviation to be irrelevant
             for the purpose of the study).

          -  Normal electrocardiogram (ECG) and vital signs, or abnormalities which the
             investigator did not consider a disqualification for participation in the study.

          -  Willingness to undergo pre- and post-study physical examinations and laboratory
             investigations.

          -  Ability to comprehend and willingness to sign both statements of informed consent (for
             screening and phase-related procedures).

          -  Non-smoker or past smoker who stopped the use of any form of tobacco, including snuff
             or similar products, at least 3 months before entering the study.

          -  For females, the following conditions had to be met:

               1. had been surgically sterilized or undergone a hysterectomy, or

               2. was of childbearing potential, and all of the following conditions were met:

                    1. Had a negative pregnancy test at screening. If this test was positive, the
                       subject was to be excluded from the study before receiving study medication.
                       In the circumstance that a pregnancy was discovered after the subjects
                       received the study medication, every attempt had to be made to follow such
                       subjects to term.

                    2. Had to agree to use an accepted method of contraception (i.e., spermicide
                       and barrier methods or spermicide and non-hormonal intrauterine
                       contraceptive device). The subject had to agree to continue with the same
                       method throughout the study. Hormonal contraceptives were not allowed.

               3. females not of childbearing potential could also have been included if they had
                  no menstrual period for one year and were considered as post-menopausal.

        Exclusion Criteria:

          -  Evidence of psychiatric disorder, antagonistic personality, poor motivation, emotional
             or intellectual problems likely to limit the validity of consent to participate in the
             study or limit the ability to comply with protocol requirements.

          -  History of, or current compulsive alcohol abuse (>10 drinks weekly), or regular
             exposure to other substances of abuse.

          -  Use of any medication, prescribed or over-the-counter, within 2 weeks prior to the
             first administration of study medication except if this would not affect the outcome
             of the study in the opinion of the investigator.

          -  Participation in another study with an experimental drug, where the last
             administration (of previous study medication) was within 8 weeks before the first
             administration of study medication.

          -  Treatment within the previous 3 months with any drug with a well-defined potential for
             adversely affecting a major organ or system with evidence to this effect.

          -  A major illness during the 3 months before commencement of the screening period.

          -  History of hypersensitivity to the study medication or any related medication.

          -  History of bronchial asthma.

          -  History of epilepsy.

          -  History of porphyria.

          -  Relevant history or laboratory or clinical findings indicative of acute or chronic
             disease, likely to influence study outcome.

          -  Donation or loss of blood equal to or exceeding 500 mL during the 8 weeks before the
             first administration of study medication.

          -  Diagnosis of hypotension made during the screening period.

          -  Diagnosis of hypertension made during the screening period or current diagnosis of
             hypertension.

          -  Resting pulse of > 100 beats per minute or < 40 beats per minute during the screening
             period, either supine or standing.

          -  Positive testing for HIV and/or Hepatitis B and/or Hepatitis C.

          -  Positive urine screen for drugs of abuse.

          -  Positive urine screen for tobacco use.

          -  A serum pregnancy test (beta human chorionic gonadotropin [β-HCG]) either positive or
             not performed or lactation.