How long after 1 syringe of Juvederm should you wait to do a second?

Thank you for sharing your question about Juvederm. In my practice, I advise my patients to wait a full 2 weeks before following up to get more filler. This is because, as you mentioned, lip fillers can create swelling, which can temporarily exaggerate your result. Once the swelling has settled after several weeks, your true result will be visible. I recommend following up with your injector after the two week mark to discuss adding more filler. If your lips are very thin, a second syringe may offer you the volume you are looking for. Good luck with your follow up visit. 

You should wait two weeks after injection before considering additional product in order for all bruising and swelling to subside.  Once you achieve the desired volume occasional touch ups can be done approximately every 4-6 months depending on how your body metabolizes the product.

I would recommend waiting at least 2 weeks, after the one syringe of Juvederm was placed in your lips, before considering adding more.  Juvederm in the lips will last a matter of months, so you will most likely need to return for treatment after several months.