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So why does the total number of units that you are given matter so much?
Studies have shown a clear dose-response relationship between the duration of effect and the dosage that you are given.
If you are given 20 units of Botulinum toxin (Botox) into your glabella frown line region it will last about 16 weeks in 75% percent of clients, whereas if clients are given half that dose it will only last that long 35% of the time, and you will therefore probably be needing more treatment well before the end of four months after your last treatment with this dosage.