The trapezius is a large, triangular muscle spanning from the base of the skull down to the mid-back and out to the shoulders. In many people — particularly those who are athletic, stressed, or carry tension in their upper body — the upper trapezius becomes bulky and overdeveloped, creating a thick, short-looking neck-to-shoulder line.

Botox injected into the upper trapezius weakens and gradually slims the muscle, creating a longer, more elegant slope from the neck to the shoulder — the “Barbie Botox” look that has made this one of the fastest-trending aesthetic treatments on social media. But it’s not just cosmetic: many patients seek this treatment primarily for chronic neck and shoulder tension, desk-related stiffness, and tension headaches.

Dr Azra Vaziri treats both goals simultaneously — patients leave with slimmer shoulders and relief from the tension that brought them in.

Aesthetic: Shoulder Slimming

• Slims bulky, overdeveloped trapezius muscles
• Creates a longer, more elegant neck-to-shoulder line
• Makes the neck appear taller and more slender
• Softens a wide or square shoulder silhouette
• The “Barbie Botox” effect trending on social media

Visible slimming in 2–4 weeks. Maximum effect at 6–8 weeks.

Therapeutic: Tension Relief

• Relieves chronic neck and shoulder tension
• Reduces tension headaches originating from the upper back
• Eases desk-related stiffness and pain
• Reduces habitual shoulder shrugging
• Complements physiotherapy and posture correction

Tension relief within 1–2 weeks. Often dramatic for chronic sufferers.

Assessment

Dr Azra palpates the trapezius, assesses muscle bulk, and marks injection points.

Injection

Multiple injection points across each trapezius. 15–20 minutes. Mild pinching sensation.

Relaxation

Week 1–2: Tension eases. Shoulder shrugging reduces. Headaches may improve.

Slimming

Week 2–4: Muscle begins to slim. Shoulders look narrower. Neck appears longer.

• Bulky or overdeveloped upper trapezius muscles
• Wide, square shoulder silhouette you want to soften
• Chronic neck/shoulder tension from desk work or stress
• Tension headaches originating from the upper back
• Athletic patients with hypertrophied traps from training
• Seeking the elongated “Barbie Botox” neck-shoulder line

• Shoulder width from bone structure (not muscle) — Botox won’t change skeletal frame
• Active shoulder injuries or rotator cuff issues
• Pregnancy or breastfeeding
• Neuromuscular conditions

Dr Azra assesses whether your shoulder width is muscular (treatable) or skeletal during consultation.

• Day 1–7: No visible change yet. Some patients feel slightly less tension in the upper back.
• Week 1–2: Tension relief becomes noticeable. Shoulder shrugging feels reduced. Headaches may improve.
• Week 2–4: Muscle begins to slim visibly. The neck-to-shoulder line starts to elongate.
• Week 6–8: Maximum slimming effect. Shoulders appear noticeably narrower and more refined.
• Month 4–6: Effects gradually wear off. Muscle regains bulk. Maintenance treatment recommended.

With repeated sessions (2–3), the trapezius progressively reduces in size. For post-treatment guidance, see the Botox aftercare guide.

• Nefertiti Lift — the most popular combination. Nefertiti treats the jawline-to-neck transition; Trap Tox treats the neck-to-shoulder transition. Together: a complete elongated, sculpted neck-shoulder line
• Masseter Botox — for patients wanting both jaw slimming and shoulder slimming in the same session
• Upper face Botox — can treat forehead, frown, and crow’s feet alongside Trap Tox in one visit

Nefertiti Lift

Jawline + neck lifting.

Masseter Botox

Jaw slimming.

Body Treatments

All body options.

Hyperhidrosis

Stop excess sweating.

All Botox Areas

Full treatment guide.

How Many Units

Area-by-area dosage.

Botox Aftercare

Post-treatment tips.

Botox vs Dysport

Which product?

Myths vs Facts

10 myths debunked.

Botox Pricing

All area costs.