Dideoxyinosine is an antiviral drug that is used to treat HIV infections. There are several synonyms for this drug, including didanosine, ddI, and 2',3'-dideoxyinosine. These names refer to the same chemical compound and are often used interchangeably in medical literature. Didanosine works by interfering with the replication of the virus, thereby reducing its ability to cause damage to the immune system. It is commonly prescribed in combination with other antiretroviral drugs to increase its potency and reduce the risk of drug resistance. Despite its effectiveness, didanosine can cause side effects such as nausea, diarrhea, and headaches. Patients taking this drug should be closely monitored by their physician to ensure that they are not experiencing any adverse reactions.