‘Botox vs Dysport — what’s the difference? Which one fits me?’ is one of the most common patient questions at Rappoel Dermatology near Gangnam Station. Both are FDA-cleared, widely used in medical aesthetics and medicine, but their molecular structures differ — meaning different ranges, feeling, and best-fit indications. This article consolidates the real differences, area-by-area selection guide, and common side effects.

What are Botox and Dysport? Their shared foundation

Both are Type A botulinum toxins that block acetylcholine release at nerve endings, relaxing muscles and reducing dynamic wrinkles. Their shared characteristics:

• Same core mechanism: both block neuromuscular transmission to achieve muscle relaxation
• Long-proven safety: Botox since 2002, Dysport since 2009 — hundreds of millions of treatments worldwide
• Similar duration: both maintain 3-6 months (depending on area and individual biology)
• Both require a qualified physician: both are prescription drugs; injection location and dose directly affect effect and safety

The differences lie in molecular structure, purification method, and diffusion range — these are the main factors in choice.

Botox vs Dysport: 4 key differences

The main differences:

• Molecule size and diffusion range: Botox molecular weight about 900 kDa, diffuses more locally, precise control over small areas; Dysport molecular weight about 500-700 kDa, diffuses more broadly, covers large areas evenly
• Onset speed: Botox takes about 3-7 days to fully kick in; Dysport about 1-3 days — Dysport is about 2-3 days faster, suits patients wanting quick visible results
• Unit conversion: Botox and Dysport ‘units’ are defined differently — 1 unit Botox ≠ 1 unit Dysport; clinical conversion is roughly 1 Botox unit ≈ 2.5-3 Dysport units; ‘per-unit price’ cannot be directly compared
• Common uses: Botox is often used for small precise areas (crow’s feet, glabella, jawline); Dysport is often used for large areas (forehead, shoulders, underarm sweating, calves)

Once you understand the differences, the choice logic is clear: ‘small precise area’ → Botox; ‘large area + quick effect’ → Dysport; ‘medium area’ → either works.

Area-by-area selection guide

Different treatment areas favor different brands. Rappoel’s clinical selection guideline:

• Crow’s feet, glabella, mouth corner lines (small precise): usually Botox — local diffusion reduces risk of affecting nearby muscles (eye area, upper lip)
• Forehead lines (large uniform): either works, Dysport more common — even diffusion covers the entire forehead in one session, more natural look
• Jawline (masseter): either works, Botox more common — physician can precisely control one side’s masseter, avoiding impact on smile
• Shoulders, trapezius (‘fairy shoulder’ treatment): usually Dysport — large area treatment requires higher doses; Dysport’s even diffusion is a clear advantage
• Calves, gastrocnemius (calf slimming): usually Dysport — higher doses and large area; Dysport is more economical and even-result
• Axillary hyperhidrosis: either works, Dysport more common for large-area sweating control

The choice key is the size of the treatment area: small → Botox, large → Dysport. But this is not absolute — physician judgment based on individual biology, past experience, and budget also matters.

Which lasts longer, Botox or Dysport?

Clinical data on ‘duration’ is similar, but with subtle differences:

• Overall duration: both maintain 3-6 months; individual patients may see 1-2 months difference
• Factors affecting duration: personal muscle strength, metabolism speed, lifestyle (high-activity patients metabolize faster), injection dose and precision
• ‘Resistance’ issue: long-term repeated injections with either may produce antibodies, reducing effect — incidence is low (about 1-3%), but possible. Prevention: at least 3 months between sessions, avoid overdosing, switch brands if needed
• Individual tolerance differences: some patients respond better to Botox, some to Dysport — this is individual difference, hard to predict in advance

Duration difference is not the key choice factor for most patients — treatment area, dose, and physician skill affect outcomes more than the brand.

Botox and Dysport side effects and safety

Both share similar side effects; the main difference comes from ‘diffusion range’:

• Common side effects: injection site redness, swelling, bruising (1-2 weeks); mild headache (rare); very rare eyelid ptosis or expression asymmetry
• Dysport (broader diffusion): more likely to affect nearby non-target muscles — this is an advantage in large-area treatment (forehead, shoulders), but can cause side effects like eyelid ptosis in small areas (crow’s feet), which is why small-area usually picks Botox
• Botox (more local diffusion): depends more on physician precision — if position or dose judgment is off, the result may be uneven
• Who should not get either: pregnant or breastfeeding patients, those with infection or inflammation at injection sites, neuromuscular disease patients (e.g., myasthenia gravis), those allergic to botulinum toxin
• Use with caution: patients on certain antibiotics (e.g., aminoglycosides) or muscle relaxants — may increase effect, disclose to your physician

What a real botulinum toxin session looks like at Rappoel

Whether choosing Botox or Dysport, the procedure is similar. Rappoel’s standard:

• Step 1 · Consultation: physician assesses muscle strength (using Ashworth scale or clinical experience), past treatment history, and desired effect — deciding brand, dose, and injection location
• Step 2 · Photo documentation: frontal and expression photos (frowning, raising brows, smiling) as baseline for 2-week and 3-month effect comparison
• Step 3 · Skin disinfection: thorough disinfection with alcohol or iodine at injection sites
• Step 4 · Precise injection: use ultra-fine needles for multi-point injection into target muscles; ice may reduce discomfort; Rappoel uses authentic Botox and Dysport, both with full traceability
• Step 5 · Post-care guidance: explains first 4-hour precautions (avoid lying down, massaging, strenuous exercise); schedules a 2-week follow-up
• Step 6 · Follow-up: 2-week follow-up to check effect, allowing minor adjustments if needed; 3-month check to plan next session

Rappoel’s physicians have years of botulinum toxin injection experience and are familiar with Botox vs Dysport dose conversion and area indications — they can recommend the right brand based on each patient’s skin, budget, and past response.

Common questions about Botox and Dysport

The most frequently asked questions, summarized:

• Q1. How big is the price difference? A: Manufacturer list prices are similar; actual treatment cost depends on injection dose and area. Because units are defined differently, ‘per-unit price’ cannot be directly compared — compare by ‘treatment area + total cost,’ not by unit price.
• Q2. Which to choose for first-time? A: Depends on area. Forehead, shoulders, calves — Dysport. Crow’s feet, glabella — Botox. Jawline, masseter — either works.
• Q3. Can you alternate? A: Yes, but watch for resistance. Long-term alternation may increase the risk of antibody formation. Most physicians recommend sticking with one brand per cycle to avoid effect reduction.
• Q4. Which is more popular in Korea? A: Both are widely used in Korea. Dysport has a slightly higher usage in Korea due to faster onset and relative affordability. Botox remains the mainstream choice — particularly for small-area precise treatment.

Related reading: the full Botox frequency guide is at How often should you get Botox?; the dynamic vs static wrinkles decision guide is at Dynamic vs static wrinkles; the jawline Nefertiti lift guide is at Nefertiti lift in Seoul.

Frequently Asked Questions

Wondering whether Botox or Dysport fits you? Book a consultation at Rappoel — your physician will assess muscle strength and treatment area to recommend the best option!

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