Dysport vs Botox: Spread, Onset and Which Areas Suit Each

Dysport and Botox are the two wrinkle relaxers patients ask us to compare most often at Vital Medical Care & Aesthetics. Both are botulinum toxin type A, both are FDA approved for the frown lines between the brows, and both are injected the same way. The differences are real but smaller than the marketing suggests, and they matter mainly for how the dose is planned and where the product is placed.

The direct answer: Dysport tends to spread a little wider and show its first effect a day or two sooner, which makes it a good fit for broad areas such as the forehead. Botox stays closer to the injection point, which suits small, precise targets. Units are not interchangeable between them, duration is similar at three to four months, and the side effect profile on the FDA labels is close to identical. Which one you get is decided at the consultation with Dr. Vital.

What both are: the same mechanism, a different formulation

Both products are purified botulinum toxin type A that blocks the release of acetylcholine at the junction between a nerve and a muscle. The muscle stops receiving the signal to contract, the skin above it stops folding, and the line softens. Neither product changes the muscle or the skin directly.

Botox is onabotulinumtoxinA, approved for cosmetic use in 2002. Dysport is abobotulinumtoxinA, approved for frown lines in 2009. The active toxin is the same protein; what differs is the manufacturing process, the size of the protein complexes around it, and the amount of toxin that each labeled unit represents. Our Dysport page and our Botox treatment page describe each service on its own.

The key differences: molecule, spread, onset and duration

The table below lists the differences that change treatment planning. All figures are typical ranges from the FDA prescribing information and the published literature, not a result any patient is promised.

Feature	Botox	Dysport
Active ingredient	onabotulinumtoxinA	abobotulinumtoxinA
Label dose, frown lines	20 units in 5 sites	50 units in 5 sites
First visible effect	3 to 5 days	2 to 3 days
Full effect	About 14 days	About 14 days
Typical duration	3 to 4 months	3 to 4 months, up to 5 in some patients
Spread from the injection point	Tighter	Slightly wider
Cosmetic approvals	Frown lines, forehead lines, crow’s feet, neck bands	Frown lines

The spread difference is the one that shapes technique. In studies that measured the area affected around each injection point, Dysport covered a slightly larger zone at commonly used doses. That is useful across a wide forehead and a drawback next to the muscle that lifts the eyelid.

Units are not interchangeable: how the conversion works and why your injector decides

One unit of Dysport is not one unit of Botox. The FDA label for each product states that its units are specific to that product and cannot be converted to another by a fixed formula. In practice, physicians work from the label doses: 20 Botox units and 50 Dysport units treat the same frown lines, which gives a working ratio of about 2.5 to 1, and published studies have used ratios between 2 to 1 and 3 to 1.

This matters when you read your chart or compare quotes. A forehead treated with 50 Dysport units has not received more than twice the medicine of a forehead treated with 20 Botox units; it has received roughly the same amount, measured on a different scale.

Why the ratio is a range and not a number

The two products spread differently and are tested on different assays, so the ideal ratio shifts a little with the area, the muscle and the result the patient wants. A heavy frown muscle may do well at 3 to 1; a lighter forehead may sit nearer 2 to 1. This is why dosing is decided by the physician at the consultation and refined at the two week review, rather than taken from a chart.

Which areas suit Dysport and which suit Botox

Dysport’s wider spread suits large, flat muscles where you want even coverage with fewer injection points. Botox’s tighter spread suits small muscles sitting next to structures you do not want relaxed.

Areas that often suit Dysport

• Horizontal forehead lines across a wide or tall forehead
• Frown lines in a patient with a broad, strong glabellar complex
• Crow’s feet that fan out over a wide area

Areas that often suit Botox

• The lip flip, where a few units sit in a thin muscle close to the mouth
• The brow tail lift, a few units placed just under the brow near the eyelid lifting muscle
• Bunny lines on the nose, the chin and other small targets
• Patients who have used Botox for years with a reliable result

These are tendencies, not rules. Many patients receive Dysport in the forehead and Botox in a precise spot at the same visit. The choice is made after Dr. Vital watches how your face moves.

Side effects and safety for both: what the FDA labels say

The safety profiles are close to identical, because the active molecule is the same. Both labels carry the same boxed warning about the possibility of toxin spreading beyond the injection site, which at cosmetic doses in the face is rare, and both list the same categories of common side effects.

Common side effects in the frown line trials

• Headache, reported in roughly one in ten patients for both products
• Eyelid droop, in about 2 to 3 percent, usually appearing within two weeks and resolving as the product wears off
• Injection site pain, redness, swelling or a small bruise
• Dysport only: nasopharyngitis, a cold like stuffiness, listed in about one in ten trial patients

Contraindications and reasons to tell the physician

Neither product is given where there is an infection at the injection site or a known allergy to any botulinum toxin product. Dysport is also contraindicated in patients allergic to cow’s milk protein, because the formulation contains it. Both labels advise caution in neuromuscular conditions such as myasthenia gravis, Lambert Eaton syndrome and ALS, where the risk of weakness and swallowing or breathing difficulty is higher. Both labels state that there are no adequate data in pregnancy and that it is not known whether the toxin passes into breast milk, so we defer cosmetic treatment in both situations.

Tell the physician about blood thinners, aspirin, fish oil and vitamin E, which raise the chance of bruising. Trouble swallowing, speaking or breathing, or weakness away from the treated area, needs a call the same day.

Cost: how each is priced, by unit versus by area

Both products are usually priced per unit, and because Dysport uses about two and a half times as many units for the same area, its per unit figure is lower while the total for a treatment lands in a similar range. Some clinics price by area instead, which removes the unit arithmetic but can hide a light dose. At Vital Medical Care, pricing is confirmed at the consultation once the dose is planned, and the structure is outlined on our price guide.

When comparing, ask for the total for the area and the units it includes in the product’s own scale. A low per unit figure for Dysport and a higher one for Botox often describe the same treatment.

Can you switch between them

Yes. Switching from one to the other is common and is done at the next treatment cycle, once the current product has worn off, usually three to four months after the last visit. The physician converts the dose into the new product’s scale, treats, and reviews at two weeks. There is no washout period beyond letting the previous treatment fade.

Patients switch to see whether the faster onset or wider spread suits them, or because a result felt short. Mixing the two in the same area at the same visit is usually avoided. Jeuveau and Daxxify, the other two relaxers we offer, follow the same rule, and Jeuveau is covered in our guide to Jeuveau versus Botox.

How Dr. Vital chooses at the consultation

The consultation starts with the muscle, not the product. Dr. Vital watches you raise your brows, frown and smile, notes the size and strength of each muscle group, and asks what you want to keep moving. From that follow the area, the product and the dose, with a two week review to refine. Candidacy, dosing and product are decided there; mention pregnancy, breastfeeding, neuromuscular conditions and blood thinners first.

Vital Medical Care & Aesthetics is at 2209 Merrick Rd, Suite 202, Merrick, NY 11566, about a ten minute walk from the Merrick LIRR station, with the NICE n19 bus along Merrick Road. Hours are Monday 9am to 5pm, Tuesday 9am to 7pm, Wednesday and Thursday 7:30am to 5pm, Friday 9am to 5pm and Saturday 9am to 2pm. Visits are by appointment: book Dysport online or call (516) 414-1101.

Questions readers ask

Read next

• Jeuveau vs Botox: What Changes for a First Time Patient
• Daxxify vs Botox: The Longer Lasting Option Explained
• How Many Units of Botox the Forehead Takes, and Why It Varies