Episode 20: HIV Pre-exposure Prophylaxis (PrEP)

Adolescent Medicine, Emergency Medicine, HIV, Pediatric Emergency Medicine, Sexual Health

On this episode, host Jason Woods speaks with Martin Walker (Director of HIV Programs for Planned Parenthood of the Rocky Mountains) and Moises Munoz (Prevention Services Manager Children’s Hospital Immunodeficiency Program, Children’s Hospital Colorado) about pre-exposure prophylaxis for HIV (PrEP).

The highlights:

  • The only FDA approved PrEP regimen the combination product of emtricitabine/tenofovir (brand name Truvada)
  • It was approved in 2012 for PrEP
  • Typical dosing is one pill (200/300) once per day, for patients > 35 kg (regardless of age)
  • Prior to the start of PrEP, counseling and labs are suggested
    • Labs required before the start of PrEP include baseline creatinine and UA, negative studies for HIV and Hepatitis, pregnancy if applicable, and other STIs (all of these are included in ongoing monitoring as well)
    • Counseling should include discussion of risk factors, compliance, required testing, need for continued protection from other STIs
    • Generally not recommended to use in patients with GFR < 60
  • From the start of use, different tissues require different amounts of time to reach effective concentrations. There is not clear data on this but Martin suggests 7 days for receptive anal intercourse and 21 days for receptive vaginal intercourse.
  • Some studies suggest that for penile-anal intercourse, as few as 4 doses per week may be effective.
  • See below for training resources


Martin Walker – Director of HIV Programs for Planned Parenthood of the Rocky Mountains

Moises Munoz – Prevention Services Manager Children’s Hospital Immunodeficiency Program, Children’s Hospital Colorado

Important Resources


  1. Hosek S, Rudy B, Landovitz R, et. al. “An HIV Pre-Exposure Prophylaxis (PrEP) Demonstration Project and Safety Study for Young MSM”. J Acquir Immune Defic Syndr. 2017 Jan 1; 74(1): 21–29. PMID: 27632233
  2. Grant RM, Anderson PL, McMahan V, et al. Uptake of pre-exposure prophylaxis, sexual practices, and HIV incidence in men and transgender women who have sex with men: a cohort study. Lancet Infect Dis 2014; 14:820. PMID: 25065857.
  3. Krakower DS, Mayer KH. Pre-exposure prophylaxis to prevent HIV infection: current status, future opportunities and challenges. Drugs 2015; 75:243. PMID: 25673022.
  4. Anderson PL, Glidden DV, Liu A, et al. Emtricitabine-tenofovir concentrations and pre-exposure prophylaxis efficacy in men who have sex with men. Sci Transl Med 2012; 4:151. PMID: 22972843.
  5. Seifert SM, Glidden DV, Meditz AL, et al. Dose response for starting and stopping HIV preexposure prophylaxis for men who have sex with men. Clin Infect Dis 2015; 60:804. PMID: 25409469
  6. Anderson PL, Meditz A, Zheng JH. Cellular pharmacology of TFV and FTC in blood, rectal, and cervical cells from HIV- volunteers. Presented at the Conference on Retroviruses and Opportunistic Infections 2012.

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