Using a new sterile syringe and needle for each injection is one of the most effective ways to prevent the spread of blood-borne infections.

Use a new packaged sterile syringe and needle for every injection.
Inspect the packaging very carefully. Discard a needle or syringe if the package has been punctured, torn or damaged in any way.
Check the expiry date on the package. Never use needles or associated injection materials that are 'out of date'.
Prepare injections in a clean designated area or on a clean surface; in a patient's home you will need to use a clean dish or tray that you have washed in soap and water, left to air dry and then swabbed with alcohol before laying out the injection equipment.
Prepare each dose immediately before administering; do not prepare several syringes in advance.
Do not touch the needle. Discard a needle that has touched a non-sterile surface.