Emtricitabine, nelfinavir, and tenofovir are antiviral drugs that prevent human immunodeficiency virus (HIV) from multiplying in your body. Basically, this combination medicine is used to treat HIV, the virus that can cause acquired immunodeficiency syndrome (AIDS). However, this combination of Emtricitabine, Nelfinavir, and Tenofovir is not exactly a cure for HIV or AIDS. In addition, it may also be used together with safer-sex practices to reduce the risk of becoming infected with HIV, yet you must be HIV-negative and an adult to use the medicine for this purpose. Bear in mind that you should not take this medicine if you have severe liver or kidney disease. Plus, you should not take it if you also use other medicines that contain emtricitabine, tenofovir, or lamivudine. Also remember that you must not take this combination medicine to reduce infection risk if you are HIV-positive, if you have been exposed to HIV within the past month, or if you had any symptoms (such as fever, sore throat, night sweats, swollen glands, diarrhea, body aches). When it comes to using the “Emtricitabine, nelfinavir, and tenofovir” combination, it is preferable that you take it with food. Remember to get emergency medical help if you have even mild allergic reactions such as muscle pain or weakness, numb or cold feeling in your arms and legs, trouble breathing, stomach pain, nausea with vomiting, slow or irregular heart rate, dizziness, or feeling very weak or tired.