Hos patienter, der tidligere har fået medicin mod deres hiv- infektion, bør lægen, inden Viread ordineres, gennemgå patientens tidligere antivirale medicin og vurdere sandsynligheden for, at antiviral medicin virker på viruset.
For patients who have taken medicines to treat HIV infection before, doctors should only prescribe Viread once they have looked at the antiviral medicines the patient has taken before or the likelihood of the virus ’ s response to antiviral medicines.