What can nasal alar Botox change?
Nasal alar Botox aims to reduce the outward movement of the nostril wings, or alae, when you smile or laugh. Botulinum toxin temporarily weakens the muscles contributing to this flare. It may make the nostrils look less spread during expression, but the amount of change varies.
It does not remove nasal tissue or shrink bone or cartilage. A naturally broad nasal base at rest is different from extra widening caused by movement. There is no reliable promise that every nose will become a set number of millimetres narrower.
Small clinical studies have found reduced alar movement, but the evidence is limited. Research on nostril overexposure also suggests temporary improvement in selected patients; this does not establish the same result for everyone with wide nostrils.
A tip that drops during smiling and bunny lines beside the bridge are separate concerns. They need their own assessment and should not be treated as interchangeable with nostril flare.
Who might benefit, and who needs extra caution?
An adult whose nostrils flare more with facial expression may consider an assessment if they accept a temporary, possibly subtle change. The doctor should examine the nose at rest and while smiling, including the upper lip and any existing asymmetry. Wanting to avoid surgery does not make Botox suitable for a structural concern.
- Allergy or infection: treatment should not proceed with a known allergy to the toxin or an ingredient, or an infection at the proposed injection site.
- Health and previous procedures: mention muscle or nerve disorders, swallowing or breathing problems, and previous nasal surgery, implants or filler.
- Medicines and other injections: tell the doctor about medicines, supplements and recent toxin treatments elsewhere. Some antibiotics and muscle relaxants can increase its effects. Do not stop prescribed medicines yourself.
- Pregnancy or breastfeeding: discuss pregnancy, plans to become pregnant or breastfeeding before elective treatment because safety information is limited.
How many units are needed, and which product should be used?
There is no single dose for nasal flare. The product, muscle activity, anatomy and previous treatment all matter. BOTOX is one brand of botulinum toxin, and units from different products cannot be compared or converted directly. More units do not necessarily mean a better result.
In Thailand, ask for the exact product name and Thai registration, and whether the proposed use is covered by its local label. For example, the Thai registry entry for BOTOX 100 units, registration 1C 21/55 (NB), does not list nasal alar reduction among its displayed indications. That record is a product summary, not the complete prescribing information or a treatment dose. The doctor should check the relevant Thai label and explain the benefits, limits and risks if use is off-label.
Choose a licensed medical clinic and a qualified doctor. Claims that a brand is always more precise, longer-lasting or unable to cause resistance are not a sound basis for choosing treatment.
Does nasal alar Botox hurt, and what happens at the appointment?
Injections can sting or feel like a brief pinch; discomfort varies. Cooling or numbing may be discussed. Swelling, redness or bruising can occur, so a short procedure does not mean there will be no visible marks afterwards.
- The doctor assesses nasal movement and health history, then discusses the likely benefit and alternatives.
- If treatment is appropriate, the doctor selects the product and dose, cleans the skin and performs the injections.
- You receive aftercare advice and a plan to review both nostril movement and your smile.
When do results appear, and how long do they last?
The effect develops gradually and is temporary. Available nasal studies support improvement over a period of months, but they do not establish one onset or duration for every product and patient. Ask when your result should be reviewed, and compare photographs taken with similar lighting, angles and expressions.
You do not have to keep having injections. If you want to repeat treatment, review the benefit and any unwanted effects with the doctor first. Avoid early top-ups simply because changes are subtle. A weaker response does not automatically mean antibody-related resistance or a need for a higher dose.
What aftercare is useful?
Avoid rubbing or massaging the injection area. Apply skincare or makeup gently and follow the doctor’s advice about exercise and other activities. These precautions cannot guarantee how long the result lasts.
Keep the agreed review appointment. Contact the treating clinic if your smile changes or the result concerns you rather than arranging extra injections without reassessment.
What are the risks and warning signs?
Possible effects include soreness, redness, swelling and bruising. Unwanted weakness in nearby muscles may change upper-lip movement or make the smile uneven. Seek medical advice for marked asymmetry, increasing redness, warmth or swelling, or significant pain.
Get urgent medical help for difficulty breathing, swallowing or speaking, widespread weakness, or facial or tongue swelling with an allergic reaction. Serious toxin effects can occur hours to weeks after injection. Do not wait for a routine follow-up.
How much does nasal alar Botox cost in Thailand?
The cost depends on the product and treatment plan. Ask for the total price per session, the exact product and what review or follow-up care is included. You can contact Smooth Clinic for current pricing and an appointment enquiry.
References
- Zhong Y, et al. Botulinum toxin type A for reducing alar mobility. Aesthetic Surgery Journal. 2022.
- Wang X, et al. Botulinum toxin type A for nostril overexposure. Aesthetic Plastic Surgery. 2025.
- Modarresi ZS, et al. The use of botulinum toxin for nasal esthetics: a systematic review. 2024.
- Thai FDA. BOTOX 100-unit product record, registration 1C 21/55 (NB).
- DailyMed. BOTOX Cosmetic U.S. prescribing information (safety reference; not Thai approval).
- American Academy of Dermatology. Preparing for botulinum toxin treatment and aftercare and FAQs.