Are you using Allergan Botox or Ipsen Dysport? The conversion units between these two products are 1:3 (1 unit of botox for approximately 3 units of dysport).

I use 3mL Normal Saline to dilute each vial of Botox or Dysport.

3mL of NS into one vial of 100 units of Botox = approximately 3-4 units per 0.1 mL
3mL of NS into one vial of 500 unitis of Dysport = approximately 20units per 0.1mL

Some examples of units used in some common areas
1. Glabellar = 12-15 units of botox or 36-45 units of dysport
2. Frontalis= 15-18 units of botox or 45-54units of dysport
3. Crow's feet= 8-12 units of botox or 24-36 units of dysport per side. Double that for both eyes
4.Masseter muscle (lateral pterygoid muscle) to slim facial side profile= 30-50 units of botox or 90-150 units of dysport per side of face. Double that for both side of masseter muscles.
5. Calf muscle reduction for slimmer leg silhouete = 150 units of botox or 450 units of Dysport per leg.
6. Underarm axilla injection for dyshydrosis= 100-150 units of botox or 300-450 units of Dysport per side of axilla.

These are the most common injection sites I do in my practice. I train some local docs and residents on botox / dysport injections and always tell them to start at a lower spectrum of unit dose and add additional units 2 weeks later when patients return for follow up. The follow up session for masseter, calf, and dyshydrosis are scheduled 2 months later because larger muscles require a much longer period to see results.

I reconstitute 100 units/ml for dilution. There is less risk of migration causing assymetry or ptosis, especially when treating around the eyes.

I use 2mL Normal Saline to dilute each vial of Allergan Botox

My favorite is 2:1 dilution. It's a convenient way to measure how many units I inject. Say for example, .2 cc=10 units and it does not disperse. I believe 1:1 is the most potent form cause I can see immediate effects.