The purpose of the study is to evaluate the safety, acceptability, and PK/PD profile of maraviroc gel following rectal and vaginal administration. The study also includes oral exposure to maraviroc.

Trail 11991 is a Phase 1 randomized, open label, single-site trial. Approximately 19 participants (9 female, 10 male) will be randomized to the 9 female study arms and 4 male study arms with 1-3 participants per arm. The randomization will be completed for the product sequence and the timing of tissue sample collection.

All participants will receive both study products by multiple routes of administration (i.e., PO, PR, [and PV for female participants]), and they will be randomized to the order of product sequence and specimen sampling schedule. The male participants will receive oral and rectal MVC and the female participants will receive oral, rectal, and vaginal MVC, in randomized sequence.

Participant accrual will take approximately 6 months. Male participants will be on study for approximately 9 to 12 weeks. Female participants will be on study for approximately 12 to 16 weeks. The total duration of the study will be approximately 9 months.

Inclusion Criteria:

1. Age of 18 through 45 at screening, verified per site SOP

2. Male participants, born male; female participants, born female.

3. Willing and able to communicate in English

4. Willing and able to provide written informed consent to take part in the study

5. Willing and able to provide adequate locator information, as defined in site SOP

6. Availability to return for all study visits, barring unforeseen circumstances

7. Understands and agrees to local sexually transmitted infection (STI) reporting requirements

8. HIV-1 seronegative at screening and enrollment

9. Must be in general good health in the opinion of the investigator

10. Willing to abstain from insertion of anything in the rectum (e.g., penis, sex toy, medication, enemas) 72 hours before all rectal sampling visits and 72 after rectal biopsy visits

11. Must agree to use study-provided condoms for insertive and receptive intercourse, whether vaginal or anal, for the duration of the study

12. Must agree not to participate in other concurrent interventional and/or drug trials

    Female participants must meet the following criteria:

13. Per participant report at Screening:

    1. Not pregnant or breastfeeding
    2. Regular menstrual cycles with at least 21 days between menses
    3. Satisfactory cervical Pap result in the 24 calendar months prior to Enrollment consistent with Grade 0 according to the Female Genital Grading Table for Use in Microbicide Studies Addendum 1 to the DAIDS Table for Grading Adult and Pediatric Adverse Events, Version 1.0, December 2004 (Clarification dated August 2009), or satisfactory evaluation with no treatment required of Grade 1 or higher Pap result per American Society for Colposcopy and Cervical Pathology (ASCCP) guidelines in the 12 calendar months prior to Enrollment.
    4. Willing to abstain from vaginal insertion of anything (e.g., penis, sex toy, tampon, medication, douche) for 72 hours before all cervicovaginal sampling visits and 1 week after cervical biopsy visits

14. Per participant report at Enrollment:

    e) Using an effective method of contraception and intending to continue use of an effective method for the duration of study participation. Effective methods include hormonal methods (except contraceptive vaginal rings), intrauterine device (IUD) inserted at least 28 days prior

    Male participants must meet the following criteria:

15. Per participant report at Enrollment:

    1. Using an effective method of contraception and intending to continue use of an effective method for the duration of study participation. Effective methods include male condoms, surgical sterilization, being a man who identifies as a man who has sex with men exclusively, sexually abstinent for the past 90 days, and/or female partner use of hormonal contraception, intrauterine device [IUD], or surgical sterilization

Exclusion Criteria:

1. Undergoing or completed gender reassignment

2. Participant reports any of the following at Screening:

   1. Post-exposure prophylaxis for HIV exposure within 4 weeks prior to screening
   2. Reports history of unprotected insertive or receptive anal intercourse within 3 months prior to screening
   3. History of sexually transmitted disease in the last 3 months
   4. Known HIV-infected partners
   5. Non-therapeutic injection drug use in the 12 months prior to screening
   6. History of recurrent urticaria
   7. Allergy to soy, soybeans, peanuts, methylparaben, propylparaben, or sorbic acid
   8. Use of antiretroviral medications with activity against HIV within the 4 weeks prior to the Enrollment
   9. Use of systemic immunomodulatory medications within the 4 weeks prior to the Enrollment
   10. Use of vaginally or rectally administered medications or products (including condoms) containing Nonoxynol-9 (N-9) within the 4 weeks prior to the Enrollment
   11. Participating in another research study involving drugs or medical devices within the 4 weeks prior to the Enrollment
   12. Has plans to relocate away from the study site area during the period of study participation

3. Per participant report at screening, anticipated use and/or unwillingness to abstain from the following medications during the period of study participation:

   1. Heparin, including Lovenox® (enoxaparin sodium)
   2. Warfarin
   3. Plavix® (clopidogrel bisulfate)
   4. Any other drugs that are associated with increased likelihood of bleeding following mucosal biopsy (e.g., daily high dose aspirin (> than 81 mg), NSAIDs, or Pradaxa®)
   5. Rectally or vaginally administered medications (including over-the-counter products)
   6. Use of potent CYP3A inhibitors (e.g., ketoconazole and clarithromycin), and CYP3A inducers (e.g., anti-convulsants and St.John's wort)
   7. Multiple dose dexamethasone
   8. Antiretroviral medications with activity against HIV

4. History of significant gastrointestinal bleeding in the opinion of the investigator

5. Abnormalities of the cervical, vaginal, or colorectal mucosa, or significant symptom(s), which in the opinion of the clinician represents a contraindication to protocol-required biopsies (including but not limited to presence of any unresolved injury, infectious or inflammatory condition of the local mucosa, and presence of symptomatic external hemorrhoids).

6. Body mass index (BMI) < 18 or > 35 kg/m2

7. At screening: participant-reported symptoms, and/or clinical or laboratory diagnosis of active rectal or reproductive tract infection requiring treatment per current CDC guidelines or symptomatic urinary tract infection (UTI). Infections requiring treatment include symptomatic bacterial vaginosis, symptomatic vaginal candidiasis, other vaginitis, trichomoniasis, Chlamydia (CT), gonorrhea (GC), syphilis, active HSV lesions, chancroid, pelvic inflammatory disease, genital sores or ulcers, cervicitis, or symptomatic genital warts requiring treatment. Note that an HSV-1 or HSV-2 seropositive diagnosis with no active lesions is allowed, since treatment is not required. Note: In cases of genital GC/CT identified at screening, one re-screening 2 months after screening visit will be allowed

8. Has any of the following laboratory abnormalities at Screening:

   CHARM-03, Version 1.0 28 31st July 2014

   1. Hemoglobin < 10.0 g/dL
   2. Platelet count less than 100,000/mm3
   3. White blood cell count < 2,000 cells/mm3 or > 15,000 cells/mm3
   4. Calculated creatinine clearance ≤ 70 mL/minute using the Cockcroft-Gault equation
   5. Alanine transaminase (ALT) and/or aspartate aminotransferase (AST) > 2.5× the site laboratory ULN
   6. Total bilirubin > 2.5 ULN
   7. ≥ +1 glucose or +2 protein on urinalysis (UA)
   8. International Normalized Ratio (INR) test > 1.5× the site laboratory upper limit of normal (ULN)
   9. Positive for Hepatitis B surface antigen (HBsAg)
   10. Positive for Hepatitis C antibody (HCV Ab)
   11. CCR5 Δ 32 homozygous or heterozygous

9. Any other condition or prior therapy that, in the opinion of the investigator, would preclude informed consent, make study participation unsafe, make the individual unsuitable for the study or unable to comply with the study requirements. Such conditions may include, but are not limited to, current or recent history of severe, progressive, or uncontrolled substance abuse, or renal, hepatic, hematological, gastrointestinal, endocrine, pulmonary, neurological, or cerebral disease In addition to the criteria listed above, female participants will be excluded if they meet any of the following criteria:

10. Participant reports any of the following at Screening:

    1. Last pregnancy outcome or gynecological surgery 90 days or less prior to screening
    2. Intends to become pregnant during the period of study participation
    3. Chronic and/or recurrent symptomatic vaginal candidiasis