 Needle-exchange programmes reduce the likelihood of users of heroin and other drugs sharing the syringes and using them more than once.Syringe-sharing can lead to infections such as HIV or hepatitis C, which can spread from user to user through the reuse of syringes contaminated with infected blood.Needle and syringe programme (NSP) and Opioid Substitution Therapy (OST) outlets in some settings offer basic primary health care.