Reuse Juvederm Syringe for Future Injections?

Typically an experienced injector can estimate how much filler you will need for any given area before beginning the procedure. If you know you only need half of a syringe to start, you can just buy a smaller volume to begin with. Then if you need more you can come back and buy more. The product is sterile until it is opened. One it is opened and used, it is no longer technically sterile. I personally would not save a syringe for 6 months. I do think it is reasonable to keep the product around for a couple weeks if you have some left over and may do a touch-up on the followup visit. If that is done, to avoid potential contamination, I recommend removing the needle used, recapping the syringe, and using a new needle on the second injection. It is also important to keep that syringe clearly marked with the patient name. Regarding the lumpy and irregular appearance, that is related to your injector's judegement and technique. First, the treatment needs to be appropriate to solve the problem. For example, Botox is typically used to soften horizontal forehead lines. Really deep lines may not be fully corrected and may be addressed with filler. If filler is chosen, it much be injected with proper technique to be successful, and avoid irregularities like those you describe. The bottom line is choose your injector carefully!

It’s not unusual for patients to ask their physician to save
a partially used syringe of Juvederm. Unfortunately, there’s no way to insure the sterility of this material
once it’s been opened and used. For this
reason, we don’t save partially used syringes of filler.Although
both patients and doctors are motivated to save money, the consequences of soft
tissue infection can be significant. It’s therefore appropriate to start each new procedure with a fresh
syringes of Juvederm.

6 months is questionable and the stability of the product may be compromised if stored for this long.You should perhaps ask the MD how they are preserving the half syringe.

Here are 3 separate studies showing the safety of re-injecting unused filler in the same patient. The science says it is safe.Bellew SG, Carroll KC, Weiss MA, Weiss RA. Sterility of stored nonanimal, stabilized hyaluronic acid gel syringes after patient injection. J Am Acad Dermatol. 2005;52:988–90.Davis K, Bottone EJ, Lucas D, Lebwohl M. Sterility of refrigerated injectable collagen syringes after injection of patient. J Am Acad Dermatol. 1992;27:959–61. Culligan PJ, Koduri S, Heit MH, Rackley R, Thomson RB, Schwabe L, et al. The safety of reusing injectable collagen: A multicenter microbiological study. Int Urogynecol J Pelvic Floor Dysfunct. 2002;13:232–4. 

It is not recommended to reuse syringes secondary to risk of contamination. It is recommended and most sterile to use the products in one treatment. This should provide more filling and a more complete treatment.

First and most important question, should someone be using Juvederm in the forehead.  I think that this is generally a poor choice.  While there may be some exceptions, there are better products to use in the forehead such as Botox and even surgery (brow lift).  As you now know, with a few exceptions, Juvederm is not good in the forehead.  Usually storing Juvederm is not even an issue because it's easy to find places the product will make a difference and you can easily use the full syringe.  When doing just a small little touch up, I have stored the product in a refrigerator for up to 6 months.  I know this is in contradiction to what the company recommends and most of the authors on realself answering this question.  However, I have done this at least 20 times and never had problems.  I think the patient should be allowed to make thier own decision on this, but have the option to keep it for 6 months.