<s>[INST] Is truvada used specifically for men engaged in anal intercourse only or is it used as a sort of preventative med helping prevent infection from sucking infected men orally?  Does it insure that there will  be no STD caught as a result of taking this drug? [/INST] HiT hanks for posting your query on ChatDoctorI have read and understood your concernTruvada contains a combination of emtricitabine and tenofovir that may be used in the treat HIV though it does not cure the infection. Truvada may also be used together with safer-sex practices to reduce the risk of becoming infected with HIV. You must be HIV-negative and an adult to use Arvada for this purpose. It may not provide protection from disease in every person. So, this Chat Doctor. It only protects against HIV and some viral infections but not at 100%. Also, it may not offer protection against STDs of bacteria origin. Hope this will help. You may write back if more concerns Best regards </s>