In some countries, non-prescription intravenous glucose is used to improve a person's energy, but is not a part of routine medical care in countries such as the United States where glucose solutions are prescription drugs. Improperly administered intravenous glucose (called "ringer"), such as that which is administered clandestinely in store-front clinics, poses increased risks due to improper technique and oversight. Intravenous access is also sometimes used outside of a medical setting for the self-administration of recreational drugs, such as heroin and fentanyl.