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Systematic (IUPAC) name
Thiazol-5-ylmethyl N-[1-benzyl-4-[[2-[[(2-isopropylthiazol-4-yl)methyl-methyl-carbamoyl]amino]-4-morpholino-butanoyl]amino]-5-phenyl-pentyl]carbamate
Clinical data
Trade names Tybost
1004316-88-4 YesY
PubChem CID 25151504
ChemSpider 25084912 YesY
Chemical data
Formula C40H53N7O5S2
776.023 g/mol
 N (what is this?)  (verify)

Cobicistat, with trade name Tybost (formerly GS-9350) is a licensed drug for use in the treatment of infection with the human immunodeficiency virus (HIV).

Like ritonavir (Norvir), cobicistat is of interest for its ability to inhibit liver enzymes that metabolize other medications used to treat HIV, notably elvitegravir, an HIV integrase inhibitor. By combining cobicistat with elvitegravir, higher concentrations of the latter are achieved in the body with lower dosing, theoretically enhancing elvitegravir's viral suppression while diminishing its adverse side-effects. In contrast with ritonavir, the only other booster approved for use as a part of HAART, cobicistat has no anti-HIV activity of its own.[1]

Cobicistat is a component of the four-drug, fixed-dose combination HIV treatment elvitegravir/cobicistat/emtricitabine/tenofovir (marketed as Stribild, and also known as the "Quad Pill").[1][2] Stribild was approved by the FDA in August 2012 for use in the United States and is owned by Gilead Sciences.

Cobicistat is a potent inhibitor of cytochrome P450 3A enzymes, including the important CYP3A4 subtype. It also inhibits intestinal transport proteins, increasing the overall absorption of several HIV medications, including atazanavir, darunavir and tenofovir alafenamide fumarate.[3]


  1. ^ a b Highleyman, L. Elvitegravir "Quad" Single-tablet Regimen Shows Continued HIV Suppression at 48 Weeks. HIV and
  2. ^ R Elion, J Gathe, B Rashbaum, and others. The Single-Tablet Regimen of Elvitegravir/Cobicistat/Emtricitabine/Tenofovir Disoproxil Fumarate (EVG/COBI/FTC/TDF; Quad) Maintains a High Rate of Virologic Suppression, and Cobicistat (COBI) is an Effective Pharmacoenhancer Through 48 Weeks. 50th Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC 2010). Boston, September 12–15, 2010.
  3. ^ Lepist, E. -I.; Phan, T. K.; Roy, A.; Tong, L.; MacLennan, K.; Murray, B.; Ray, A. S. (2012). "Cobicistat Boosts the Intestinal Absorption of Transport Substrates, Including HIV Protease Inhibitors and GS-7340, in Vitro". Antimicrobial Agents and Chemotherapy 56 (10): 5409–5413. doi:10.1128/AAC.01089-12. PMC 3457391. PMID 22850510.  edit