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i have 1/2 ml syringes. Say I wanted to do aa 70 IU shot of bi mix. Could I use the same needle twice without the fear of infection?

Probable a dumb question huh. I am not going to take chances.

I've done it, but it's probably not wise to make a habit of it.
I did it on a misfire.

That is what I thought. Not a good idea. I have to admit, I have done that too. I don't think that is as bad as using the same needle that you stuck yourself with to refill the syringe and stick again.

I've done that also. Maybe it's ok to just inhale the solution, but probably not wise.
I guess what I'd do in your case is get the needles at Walmart for about $.12 a piece in lots of 100, and fill two with 35 units each.

NEVER!
I use them for Testosterone shots, 25 cents each.
I use two, one needle to get the med out of the bottle, then change needles to insert in the rear in.
Be safe my friend,
Jere

Don't try to use the needles twice, forget about just infection, when you use a needle it has a coating on it to ease the injection into the skin, the risk you run is using a dulled and blunt needle to inject which can break off in your skin. Needles are cheap by a box of 100, so get your doc to prescribe them that way, do that and you'll never have to worry about infections.

Thanks! Phew!