Botox vs Dysport: Onset, Duration, Cost and Choosing Between Them

What is the difference between Botox and Dysport?

Botox and Dysport are two prescription botulinum toxin type A products used to soften certain expression lines. They reduce the signal that tells a treated muscle to contract. With less repeated folding of the skin, the line can look softer. The effect is temporary, and movement gradually returns.

BOTOX Cosmetic contains onabotulinumtoxinA; Dysport contains abobotulinumtoxinA. Those long names identify different formulations. Their doses use product-specific units, so 20 Botox units and 20 Dysport units do not represent interchangeable treatment amounts. BOTOX Cosmetic label. Dysport label.

If you are deciding for the first time, start with the expression or line that bothers you and how much movement you want to retain. If you are considering switching, start with what disappointed you about the previous treatment. Those questions usually make the consultation more useful than asking which brand is universally “best.”

Botox vs Dysport at a glance

Clinicians may discuss uses outside a product’s labeled indications, often called off-label use. That is a separate clinical conversation about evidence, suitability and consent. The table does not mean every treatment a practice offers is FDA-approved for each brand. Botox label. Dysport label.

What is the Botox-to-Dysport unit ratio?

You will often encounter a rough comparison of 2.5–3 Dysport units for each Botox unit. Those ratios appear in clinical research and help explain why Dysport menus list a lower price per unit. They are not an FDA-approved conversion formula, and they do not make the units interchangeable.

The 2025 frown-line study and 2012 crow’s-feet study compared particular doses, areas and outcomes. A clinician may choose a different plan based on the muscles, prior response and desired movement. Multiplying an old Botox dose is not enough to determine a new Dysport treatment.

If you are switching, bring your previous treatment record. The useful question is: “What dose and areas are you proposing with this product, why, and what will the complete visit cost?”

Which wrinkles can these injections help?

Expression lines become more visible when you frown, raise your eyebrows or smile. You may hear these called dynamic lines. A line that remains while your face is relaxed is often called a static line. The same area can have both.

A natural-looking result involves the treatment plan, anatomy and technique as well as the product. Neither brand name guarantees a particular expression. Show the clinician what you like and what you want to avoid rather than assuming that one brand means “frozen” and the other means “natural.”

Does Dysport work faster than Botox?

Some comparative research supports an earlier measurable effect with Dysport, but “works faster” needs a little context. The first small change, the strongest effect and the point when a person is satisfied are different outcomes. A study that measures muscle-related skin movement on day 3 is not measuring the exact morning every participant first noticed a smoother line.

For an event, an earlier average response is not a reason to leave treatment until the last moment. You still need time for an individual response, possible bruising and any planned review. Let the clinician help you schedule around the event, especially for a first treatment.

How long do Botox and Dysport last?

The AAD describes botulinum toxin improvement generally lasting about three to four months, sometimes longer. It also describes visible results commonly appearing within three to seven days. These are broad patient expectations, rather than a head-to-head promise for either product. AAD treatment overview.

The effect usually fades gradually, so “it lasted” can mean several things: some improvement is still visible, movement is returning, the line has returned to its starting severity, or the person wants another treatment. These are not interchangeable endpoints.

What an “up to six months” finding can mean

A 2021 Dysport trial followed 301 participants, with 224 receiving Dysport and 77 placebo. At six months, approximately 46%–56% of treated participants still met a one-grade improvement measure, depending on the assessor. The study reported a median onset of two days. It did not include a Botox group. Trial abstract and outcome definitions.

A one-grade improvement is partial improvement on a rating scale. It does not mean the original peak effect lasted six months, that everyone remained satisfied for that long, or that Dysport lasted longer than Botox in that trial. A median onset of two days also means a midpoint, not a promise to each participant.

What the direct comparison adds

In the 2025 four-product trial, all groups showed improved frown-area strain through day 90. The analysis did not establish Dysport as longer-lasting than Botox at day 180. The result helps separate an earlier effect from a claim of superior six-month duration. 2025 study results.

Your clinician should discuss when to assess the result and when another treatment might be appropriate. The US labels place limits around retreatment timing; neither provides a reason to top up repeatedly whenever a little movement appears. BOTOX Cosmetic prescribing information. Dysport prescribing information.

Does Dysport spread more than Botox?

Some studies have found a wider area of effect with Dysport under particular dosing conditions. That is a real finding, but it does not establish that Dysport always spreads farther or that Botox is always more precise.

“Spread” describes how far an effect extends from the injection site. A clinician wants enough coverage to affect the intended muscle while limiting unwanted weakness nearby. Researchers sometimes measure a sweat-reduction halo, an area of skin that sweats less after injection. That is useful for studying local effects, but it is not a direct measurement of eyelid-droop risk.

Read the randomized field-effect study. It assessed several outcomes, and sweat-halo differences should not be read as interchangeable with muscle effects or complication rates.

When does the width of the effect matter?

For a broad treatment target, even coverage matters. Near muscles that control the eyelid, brow or lip, unwanted weakness matters. Both products require careful control of dose, liquid volume, placement and anatomy. A preference for one product may reflect an injector’s experience with a particular plan; it does not establish a universal “broad areas versus precision areas” rule.

The practical follow-up is: “How will you soften this area while protecting the movement I want to keep?” Be cautious about choosing a lip, brow or sweating treatment from brand claims alone; the treatment purpose and labeled or off-label status need their own assessment.

Different formulations do not give a simple ingredient-based answer either. Both products contain human serum albumin; Dysport also contains lactose. Their ingredient lists do not demonstrate a guaranteed diffusion radius. The product labels and actual comparative studies are more useful than an explanation based only on carrier proteins.

Which should you choose for your first treatment?

1. Describe the goal in everyday language. For example: “I want the frown line softened, but I still want my eyebrows to move.”
2. Ask what the clinician expects to change. Include what may remain visible, especially when your face is relaxed.
3. Understand the proposed product and why it fits. Experience treating your concern, your health history and the agreed goal should inform the explanation.
4. Agree on a review plan. Know when to evaluate the result, what a review includes and whether additional treatment costs extra.
5. Compare complete prices. Include any consultation fee, minimum charge and membership cost before choosing an offer.

If the clinician considers both suitable, faster early onset may be a preference to discuss. It should sit alongside the overall plan, not replace it. A first appointment is also a chance to decide that treatment is not right for you now.

Should you switch after an unsatisfactory result?

Switching can be reasonable to discuss, but the previous result needs to be understood first. Bring the product name, date, treated areas, recorded units and photographs if available. Explain what you noticed and when, rather than assuming your body has become resistant.

If you seek a second opinion, disclose all recent injections, including treatments received elsewhere. Both product labels address exposure to other botulinum toxin products. A new practice should not have to guess what is already active. BOTOX Cosmetic interactions and warnings. Dysport interactions and warnings.

Is Botox or Dysport safer?

Both require clinical screening and an appropriately qualified professional. Possible effects include injection-site problems, headache and unwanted weakness such as eyelid drooping; the risks depend on the product, treatment area and individual factors. Comparing percentages from separate trials can be misleading when the participants and procedures differ.

Tell the clinician about prior reactions, medicines, muscle or nerve conditions, swallowing or breathing problems, pregnancy or breastfeeding, and any recent toxin treatment. Dysport’s label specifically lists allergy to cow’s milk protein among its contraindications. Milk-protein allergy is different from lactose intolerance; explain your actual history rather than guessing from an ingredient list. Dysport contraindications.

Which costs less?

Compare the price of the clinician-proposed treatment, not a unit-price ratio. A practice can advertise Dysport at a lower price per unit while proposing a different number of units. The price of an area, a minimum charge and follow-up policy can also change the final comparison.

A fictional $480 Botox proposal and $450 Dysport proposal differ by $30 only if the scope and included services are comparable. Add a separate $50 consultation to the latter and its complete first visit becomes $500. That arithmetic says nothing about which treatment is clinically preferable.

Questions people ask about Botox and Dysport

Sources and editorial notes

Sources checked September 16, 2026. Clinical review is pending. NuWays MD is an education and referral publication, not a medical provider. This guide is not medical advice.

• AAD botulinum toxin overview: general patient expectations for onset and duration.
• BOTOX Cosmetic prescribing information: US indications, mechanism, product-specific units and warnings.
• Dysport prescribing information: US indications, unit differences, contraindications and warnings.
• 2012 split-face onset study: specific early crow’s-feet measurements with both products.
• 2025 randomized comparative trial: 3D frown-area strain, early effect, peak effect and duration; corrected version accessed.
• 2021 Dysport placebo-controlled trial: onset and six-month response definitions, without a Botox comparison arm.
• Randomized forehead field-effect study: dose-dependent findings for muscle and sweat-gland fields; a sweat halo is not a direct complication-risk measure.

Original diagrams, calculations and fictional examples explain the topic; they do not represent clinical testing or market averages. Our editorial and commercial standards.