If someone has quoted you a single number for your forehead, be a little cautious. There is no standard forehead dose for Dysport, because the FDA never approved one.
Two published consensus papers — one international group in 2010, one review in 2025 — land in the same place: about 20 to 60 Speywood units across four to six points in the frontalis, the flat sheet of muscle that lifts your brows.
Where you fall in that range depends on:
It is worth being straight about the quality of this evidence. These ranges come from panels of experienced injectors agreeing on what they do, not from trials that tested one dose against another. That is the best evidence available for this area, and it is genuinely useful — but it is not the same grade of evidence as the approved 50-unit frown-line dose.
The frontalis is the only muscle that lifts your eyebrows. Nothing else does it.
If it is weakened too much, the muscles that pull the brow down are left unopposed, and the brow sits lower than it did before. That is what a heavy or hooded look after treatment usually is. It wears off, but it takes months.
This is why careful injectors:
Adding units later is easy. Removing them is not possible. A first appointment that leaves you slightly under-treated is a better outcome than one that leaves your brows heavy for three months.
If you have had Botox before and know your forehead dose, you cannot carry that number across.
Dysport is measured on its own scale. A systematic review of head-to-head trials put the ratio between two and a half and three Dysport units for every one Botox unit — though that review covered therapeutic use in movement disorders rather than cosmetic treatment, and no study has settled a conversion for the forehead specifically. The FDA label is blunt about it: Dysport units "cannot be converted into Units of any other botulinum toxin."
So a 60-unit Dysport forehead is not three times the treatment of a 20-unit Botox forehead. It is roughly the same treatment, counted differently. This is also why a clinic advertising a low price per Dysport unit is not necessarily cheaper — you need more units to get there.
Ask what the whole treatment costs, not what one unit costs. That is the only figure you can compare between clinics and brands.
Go to an emergency department or call 911. Do not wait for a call back. These are rare, but they are the symptoms named in the FDA boxed warning that every botulinum toxin product carries, deaths have been reported, and they can begin hours or even weeks after treatment.
If a vision change is sudden or severe, seek urgent care rather than waiting.