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How Many Units in a Syringe of Botox?

  • If you’re considering Botox injections, you may be wondering how many units are in a syringe of Botox. The answer depends on the strength of the Botox and the area being treated.
How Many Units in a Syringe of Botox?

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What is Botox?

  • Botox is a popular cosmetic treatment that temporarily reduces the appearance of wrinkles.
  • It is made from a neurotoxin called botulinum toxin, produced by the bacterium Clostridium botulinum. Botox injections are the most common cosmetic procedure in the United States.

How many Botox units are in a syringe?

  • Botox is delivered as a freeze-dried protein that must be reconstituted with saline. After that, the Botox is sucked up into syringes for injection.
  • Depending on how the Botox was diluted, the syringes could contain any number of units. Botox should be purchased in units rather than syringes.
  • The amount of units, not the syringe, determines the outcome.
  • When you buy a syringe, there is no way of knowing how many units of Botox you are getting.
  • The number of units of Botox in a syringe will depend on the amount of saline added to the vial. The more saline that is added, the fewer active units will be present in each 1/10 mL that is extracted into the syringe.
  • For example, if 100 units of Botox are in a vial and 2 mL of saline are added, then there will be 80 units of Botox in every 1/10 mL extracted into the syringe.


  • Now that you know how many units of Botox are in a syringe, you can make an informed decision about how much you need for your desired results. 
  • Remember, it’s always best to consult with a board-certified dermatologist to ensure you’re getting the proper treatment for your individual needs.


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