Proper needle use is important to perform<unk>  safely, which includes the use of a new, sterile needle for each<unk>  This is partly because needles get duller with each use and partly because reusing needles increases risk of infection. Needles should not be shared between people, as this increases risk of transmitting blood-borne pathogens. The practice of using the same needle for multiple people increases the risk of disease transmission between people sharing the same medication. In addition, it is not recommended to reuse a used needle to pierce a medication bag, bottle, or ampule designed to provide multiple doses of a medication, instead a new needle should be used each time the container must be pierced. Aseptic technique should always be practiced when administering<unk> . This includes the use of barriers including gloves, gowns, and masks for health care providers. It also requires the use of a new, sterile needle, syringe and other equipment for each<unk>  as well as proper training to avoid touching non-sterile surfaces with sterile items. To help prevent accidental needlestick injury to the person administering the<unk>  and prevent reuse of the syringe for another<unk>  a safety syringe and needle may be used. The most basic reuse prevention device is an "auto-disable" plunger, which once pressed past a certain point will no longer retract. Another common safety feature is an auto-retractable needle, where the needle is spring-loaded and either retracts into the syringe after<unk>  or into a plastic sheath on the side of the syringe. Other safety syringes have an attached sheath which may be moved to cover the end of the needle after the<unk> is given. The World Health Organization recommends the use of single-use syringes with both reuse prevention devices and a needlestick injury prevention mechanism for all<unk>  to prevent accidental injury and disease transmission. Novel<unk> techniques include drug diffusion within the skin using needle-free micro-jet<unk> (NFI) technology. Disposal of used needles Used needles should be disposed of in specifically designed sharps containers to reduce the risk of accidental needle sticks and exposure to other people. In addition, a new sharps container should be begun once it is full. A sharps container which is filled should be sealed properly to prevent re-opening or accidental opening during transportation. Some locations offer publicly accessible "sharps take-back" programs where a sharps container may be dropped off to a public location for safe disposal at no fee to the person. In addition, some pharmaceutical and independent companies provide mail-back sharps programs, sometimes for an additional fee. In the United States, there are 39 states that offer programs to provide needle or syringe exchange. Over half of non-industrialized countries report open burning of disposed or used syringes. This practice is considered unsafe by the World Health Organization.
Injection 
Deep clean 
Implant 
Subcutaneous injection
Intradermal injection
Intramuscular injection
Depot injection
Transfusion medicine