- The triple combination of tenofovir, emtricitabine and efavirenz shows synergistic anti-HIV-1 activity in vitro: a mechanism of action study. Feng, J.Y., Ly, J.K., Myrick, F., Goodman, D., White, K.L., Svarovskaia, E.S., Borroto-Esoda, K., Miller, M.D. Retrovirology (2009)