sˌɪnɚdʒˈɪstɪk ɛnhˈænsɚz ʌv ˌæntɪɹˌɛtɹoʊvˈaɪɚɹəlz jˈuːʒuːəli duːnˌɑːt pəzˈɛs ˌɛni ˌæntɪɹˌɛtɹoʊvˈaɪɚɹəl pɹˈɑːpɚɾiz ɐlˈoʊn, bˌʌt wɛn ðeɪ ɑːɹ tˈeɪkən kəŋkˈɜːɹəntli wɪð ˌæntɪɹˌɛtɹoʊvˈaɪɚɹəl dɹˈʌɡz ðeɪ ɛnhˈæns ðɪ ɪfˈɛkt ʌv ðæt dɹˈʌɡ.
Synergistic enhancers of antiretrovirals usually do not possess any antiretroviral properties alone, but when they are taken concurrently with antiretroviral drugs they enhance the effect of that drug.