Single Dose Crossover Comparative Bioavailability Study of Two Formulations of Fluconazole 200 mg in Healthy Adult Subjects Under Fasting Conditions

This is a single center, randomized, 2-treatment, 2-period, 2-sequence, crossover, single dose study design, in which 26 healthy adult subjects will receive one of the study treatments during each study period.

The objective of this study is to determine the bioequivalence of two different formulations of fluconazole after a single oral dose administration under fasting conditions. The secondary objective of this study is to determine the safety and tolerability of the Test product compared to the Reference formulation in healthy subjects.

Subject eligibility for this study will be determined at the screening visit and eligible subjects will be admitted to the clinical research unit at least 10 hours prior to drug administration for each study period.

A subject who withdraws or is withdrawn during the pretrial evaluations but before receiving the IP will not be considered as a drop-out and will not be included in the final database. Standbys should be recruited and available to replace any subject who withdraws prior to the first drug administration. On-study drop-outs will not be replaced.

Altasciences will generate the randomization code with a computer program according to the study design, the number of subjects and the sequence of treatment administration. The random allocation of each sequence of treatment administration to each subject will be done in such a way that the study is balanced. Once generated, the randomization code will be final and will not be modified.

For each study period, subjects will receive a single 40 mg oral dose of olmesartan medoxomil (the test or the reference formulation). Study participants will be aware they will receive different formulations of the same drug, without being informed which product (Test or Reference) is being administered.The date and time of each dose will be recorded. For each subject, all scheduled postdose activities and assessments will be performed relative to the time of study drug administration.

Subjects will fast overnight (no food or drink except water), for a minimum of 10 hours prior to dosing. Fasting will continue for at least 4 hours following drug administration, after which a standardized lunch will be served. A supper and a light snack will be served at appropriate times thereafter, but not before 9 hours after dosing.

A total of 22 blood samples will be collected (one tube of 4 mL each) in each study period for PK assessments. The first blood sample will be collected prior to drug administration while the others will be collected up to 120 hours after drug administration.

The analyte to be measured in the present study will be fluconazole. Fluconazole plasma concentrations will be measured according to a validated bioanalytical method.

Subjects are to be discharged from the clinic after the 24-hour postdose PK sample collection, and following medical approval. However, they may be advised to stay at the clinical site for safety reasons, if judged necessary by the physician in charge. Subjects will return to the clinic for blood collections at 48, 72, 96, and 120 hours postdose.

The expected terminal elimination half-life of fluconazole is 34 hours. To avoid any carry-over effect, a wash-out of 21 calendar days is planned between drug administrations.

The decision of which subjects will be included in the PK analysis is to be documented by the pharmacokineticist (or delegate) and approved by the sponsor before the start of the sample analysis by the bioanalytical facility. Subjects who are expected to provide evaluable PK data for both the Test and Reference products (based on viable PK samples) will be included in the PK analysis. Concentration data of the remaining subjects will be presented separately. Subjects who do not complete the sampling schedule of one or more study periods may be included in the PK and statistical analysis and bioequivalence determination for only the PK parameters that are judged not to be affected by the missing sample(s).

The parameter Tmax will be analyzed using a non-parametric approach. Test of fixed period, sequence and treatment effects will be based on the Wilcoxon's rank sum test (Mann-Whitney U-test). When appropriate (e.g. small or sparse sample), the exact version of the test will also be presented. All primary endpoints will be statistically analyzed using an ANOVA model. The fixed factors included in this model will be the subject effect (nested within sequence), the treatment received, the period at which it was given, as well as the sequence in which each treatment is received.

The treatment, sequence and period effects will the evaluated at the 5% significance level. Explanations for significant effects will be provided for log transformed PK parameters.

The 90% confidence interval for the exponential of the difference in LSmeans between the Test and Reference product will be calculated for the ln-transformed parameters (Test to Reference ratio of geometric LSmeans).

Statistical inference of fluconazole will be based on a bioequivalence approach using the following standards:

• The ratio of geometric LSmeans with corresponding 90% confidence interval calculated from the exponential of the difference between the Test and Reference for the lntransformed parameters Cmax and AUC0-T should all be within the 80.00 to 125.00% bioequivalence range.
• In case if AUC0-T is less than 80% of AUC0-∞ in more than 20% of the observations, truncated AUC0-72 will be used for bioequivalence assessment instead of AUC0-T. The ratio of geometric LSmeans with corresponding 90% confidence interval calculated from the exponential of the difference between the Test and Reference for the ln-transformed parameters Cmax and AUC0-72 should all be within the 80.00 to 125.00% bioequivalence range.

The safety population will include all subjects who received at least one formulation (Test or Reference). Safety assessments will include physical examination, clinical laboratory test and AE monitoring. Additional safety measurements may be performed at the discretion of the investigator for reasons related to subject safety.

Total study duration: up to 55 days (including screening).

Inclusion criteria

• Provision of signed and dated informed consent form (ICF)
• Stated willingness to comply with all study procedures and availability for the duration of the study
• Healthy Caucasian adult male or female
• If female, meets one of the following criteria:

• Is of childbearing potential and agrees to use one of the accepted contraceptive regimens from at least 28 days prior to the first study drug administration through to at least 30 days after the last dose of the study drug. An acceptable method of contraception includes one of the following:

• Abstinence from heterosexual intercourse
• Systemic contraceptives (combined birth control pills, injectable/implant/insertable hormonal birth control products, transdermal patch)
• Intrauterine device (with or without hormones)
• Male condom with spermicide or male condom with a vaginal spermicide (gel, foam, or suppository)
• Male partner vasectomized at least 6 months prior to the first study drug administration

Or

• Male partner has had a vasectomy less than 6 months prior to dosing, and agrees to use an additional acceptable contraceptive method from the first study drug administration through to at least 30 days after the last dose of the study drug

Or

• Is of non-childbearing potential, defined as surgically sterile (i.e. has undergone complete hysterectomy, bilateral oophorectomy, or tubal ligation) or is in a postmenopausal state (i.e. at least 1 year without menses without an alternative medical condition prior to the first study drug administration)
• Aged at least 18 years but not older than 55 years
• Body mass index (BMI) within 18.5 kg/m2 to 30.0 kg/m2, inclusively
• Non- or ex-smoker (An ex-smoker is defined as someone who completely stopped using nicotine products for at least 180 days prior to the first study drug administration)
• Clinical laboratory values within the laboratory's stated normal range; if not within this range, they must be without clinical significance, as determined by an investigator
• Have no clinically significant diseases captured in the medical history or evidence of clinically significant findings on the physical examination (including vital signs) and/or ECG, as determined by an investigator

Exclusion criteria

• Female who is lactating at screening
• Female who is pregnant according to the pregnancy test at screening or prior to the first study drug administration
• History of significant hypersensitivity to fluconazole, any related azole compounds, or any related products (including excipients of the formulations) as well as severe hypersensitivity reactions (like angioedema) to any drugs
• Presence or history of significant gastrointestinal, liver or kidney disease, or any other condition that is known to interfere with drug absorption, distribution, metabolism or excretion, or known to potentiate or predispose to undesired effects
• History of significant cardiovascular, pulmonary, hematologic, neurological, psychiatric, endocrine, immunologic or dermatologic disease
• Presence of clinically significant ECG abnormalities at the screening visit, as defined by medical judgment
• Seated blood pressure below 110/60 mmHg at the screening visit
• History of rare hereditary problems of galactose and/or lactose intolerance, lactase deficiency or glucose-galactose malabsorption
• Maintenance therapy with any drug or significant history of drug dependency or alcohol abuse (> 3 units of alcohol per day, intake of excessive alcohol, acute or chronic)
• Any clinically significant illness in the 28 days prior to the first study drug administration
• Use of any prescription drugs (with the exception of hormonal contraceptives or hormone replacement therapy) in the 28 days prior to the first study drug administration, that in the opinion of an investigator would put into question the status of the participant as healthy
• Any history of tuberculosis
• Positive test result for alcohol and/or drugs of abuse at screening or prior to the first drug administration
• Positive screening results to HIV Ag/Ab Combo, Hepatitis B surface Antigen (HBsAG (B) (hepatitis B)) or Hepatitis C Virus (HCV (C)) tests
• Inclusion in a previous group for this clinical study
• Intake of fluconazole in the 28 days prior to the first study drug administration
• Use of terfenadine, astemizole, erythromycin, quinidine, pimozide, or cisapride in the 7 days prior to the first study drug administration
• Intake of an Investigational Product (IP) in the 28 days prior to the first study drug administration
• Donation of 50 mL or more of blood in the 28 days prior to the first study drug administration
• Donation of 500 mL or more of blood (Canadian Blood Services, Hema-Quebec, clinical studies, etc.) in the 56 days prior to the first study drug administration