Hyperhidrosis Injections: What to Expect

Hyperhidrosis injection treatment uses a prescription injectable product to temporarily block the nerve signals that stimulate the sweat glands in the underarm area. For people who experience excessive sweating that affects their daily life, professional confidence or clothing choices, this treatment can provide several months of meaningful relief. At Core Aesthetics in Oakleigh, hyperhidrosis treatment is assessed and administered by Corey Anderson, AHPRA registered nurse, following an individual clinical consultation.

Before Your Hyperhidrosis Appointment

Your first step is a consultation with Corey Anderson. He will take a medical history, discuss the pattern and severity of your sweating, and assess whether injectable treatment is clinically appropriate for your individual situation. As this treatment involves prescription medicines regulated by the TGA, an individual assessment is required before any treatment can be provided.

“Good information changes the quality of the decision.”

How to Prepare

In preparation for the appointment, arrive with clean dry underarms where possible. Avoid applying deodorant or antiperspirant on the day of treatment. If you shave the area, do so a few days before rather than on the day. Let Corey know about any medications or supplements you are taking, including blood thinners or supplements like fish oil, as these may affect bruising.

Read more about hyperhidrosis treatment at Core Aesthetics and about what hyperhidrosis is and what causes it.

During the Treatment

Topical numbing cream is applied to the underarm area and left in place for 20 to 30 minutes before treatment begins. Once the area is adequately numb, a series of small injections is placed across the underarm region in a grid like pattern. The specific injection sites are determined by the distribution of sweating assessed at consultation. A Minor Starch Iodine Test may be used where clinically appropriate to map the active sweating area precisely.

What the Procedure Involves

The actual injection process typically takes 10 to 15 minutes per underarm once numb. Most clients find the procedure significantly more comfortable than anticipated. Some mild pressure or brief stinging at the injection sites is normal. Total time in the clinic is usually 45 to 60 minutes for a first appointment.

Immediately After Treatment

There is generally typically returns to normal activity the same day following hyperhidrosis treatment. Normal day to day activities can be resumed immediately. The treated area may be mildly tender and you may notice small red spots at the injection sites for a few hours. These typically settle the same day.

For the 24 hours following treatment, avoid heavy exercise, saunas, very hot showers and any activity that would cause significant sweating in the treated area. This allows the product to settle without being dispersed by muscle contraction or heat. Avoid applying pressure to the underarm area for a few hours after treatment.

When Results Appear

Hyperhidrosis treatment does not produce immediate results at the time of injection. The product works by interrupting the nerve signals to the sweat glands, and this process takes time to establish. Most clients notice a meaningful reduction in sweating within five to seven days, with the full effect typically established within two weeks.

A review can be scheduled at two weeks if there are areas of incomplete coverage or if the distribution of effect warrants assessment. Additional treatment to any areas with incomplete coverage may be appropriate at this review if clinically indicated.

How Long Results Last

Hyperhidrosis injection treatment typically lasts four to eight months, though some clients experience results for up to twelve months. Duration varies between individuals based on metabolic rate, the dose used and the extent of the original sweating. As results begin to fade, repeat treatment at the point of return of sweating maintains the benefit over time.

Many clients find that consistent treatment over successive sessions produces progressively longer lasting results as the treatment becomes part of a regular maintenance schedule. Duration and repeat treatment frequency are discussed at your consultation and reviewed based on your individual response.

Is Hyperhidrosis Treatment Right for You?

Injectable hyperhidrosis treatment is most appropriate for clients where the sweating is primary axillary hyperhidrosis, excessive sweating in the underarm area without an underlying medical cause. Corey assesses the pattern and severity of sweating at consultation and will discuss whether injectable treatment is the most appropriate option for your individual situation.

Book your hyperhidrosis consultation at Core Aesthetics, 12A Atherton Road, Oakleigh VIC 3166. Open Tuesday to Saturday by appointment.

General Information Only. This article is general in nature and does not replace a consultation with a qualified health practitioner. Treatment outcomes, suitability and risks vary by individual. Any medical or prescription treatment options can only be discussed and provided where clinically appropriate following an individual assessment.

Safety, Suitability and Clinical Assessment

All cosmetic injectable procedures carry risk. The suitability assessment at consultation identifies any contraindications or relative risk factors specific to your circumstances, including medical history, current medications, previous procedures, and anatomical features that may affect the risk profile for a given treatment area. This information is reviewed before any treatment is planned.

For certain conditions and medications, injectable treatments are not appropriate, or require modification of technique or timing. For others, the treating practitioner may recommend that you consult with your primary healthcare provider before proceeding. These are clinical judgements that can only be made with accurate, complete medical history information, which is why the consultation history taking process is thorough.

Complication recognition and initial management are part of the clinical competency required of practitioners performing injectable treatments under AHPRA’s September 2025 guidelines for nonsurgical cosmetic procedures. The practitioner at Core Aesthetics holds current training in this area and maintains the relevant management supplies on site. Understanding that risk exists and is actively managed is more useful than assuming risk does not exist.

Review Appointments and Ongoing Care

A review appointment at four to six weeks is a standard part of every treatment cycle at Core Aesthetics. The review is not contingent on whether you have concerns, it is a clinical standard that applies to every patient. At review, the practitioner assesses the result across all treated areas, compares the outcome to the pretreatment clinical photographs, identifies any asymmetry or variation in response between sides, and determines whether any adjustment is appropriate within the same treatment cycle.

The review is also where longitudinal data about how your specific anatomy responds to treatment is recorded. Over multiple treatment cycles, this accumulated data allows the practitioner to refine the dosing and approach to better match your individual response pattern, which is one of the most significant advantages of maintaining a consistent treating practitioner rather than moving between clinics.

If you have any concerns in the period between your treatment and your review appointment, contact the clinic directly. The practitioner who treated you has the clinical context to respond accurately to any post treatment question, which is preferable to relying on general online information that may not reflect your specific situation.

What Causes Excessive Sweating and Why Treatment Works

Sweating is a normal physiological function. The body uses it to regulate temperature, and sweat glands in the skin respond to thermal and emotional signals transmitted through the sympathetic nervous system. In hyperhidrosis, the sweat glands in a specific area, most commonly the underarms, palms, or soles, produce sweat in volumes that exceed what the body needs for temperature regulation. The stimulus for this excess production is neural: the sympathetic nerve signals that normally activate sweat glands in response to heat are overactive, triggering sweating in response to much lower thresholds.

Anti-wrinkle treatment works for hyperhidrosis through the same mechanism it uses in cosmetic contexts, it temporarily blocks the chemical signal at the nerve ending. In hyperhidrosis treatment, the target is not a muscle but an acetylcholine dependent sweat gland. By blocking the signal, sweat production in the treated area is significantly reduced for the duration of the treatment effect.

This approach does not eliminate sweating from the rest of the body, nor does it impair normal thermoregulation, the treated area is small relative to the body’s overall capacity for sweating. The result is a targeted reduction in a specific area that is causing functional difficulty.

Clinical Assessment for Hyperhidrosis Treatment

Not everyone who sweats heavily is a candidate for injectable treatment. The consultation for hyperhidrosis at Core Aesthetics begins with an assessment of the nature, distribution, and severity of the sweating, including how long it has been present, what triggers it, and how significantly it affects daily life.

Before injectable treatment is considered, Corey will review whether conservative approaches have been adequately trialled. Prescription strength antiperspirants containing aluminium chloride are often the first line clinical recommendation for underarm hyperhidrosis, and not everyone needs to progress to injectable treatment. For patients who have not achieved adequate control with topical options, injectable treatment is a well evidenced next step.

The assessment also covers medical history, current medications, and any conditions that might affect suitability. Hyperhidrosis can be primary (no identified cause) or secondary (related to another medical condition or medication). If there is any suggestion of secondary hyperhidrosis, appropriate investigation or referral is discussed before treatment proceeds.

Clinical accountability and hyperhidrosis treatment review

The hyperhidrosis treatment guidance in “Hyperhidrosis Injections: What to Expect” reflects how Corey Anderson, AHPRA registered nurse (NMW0001047575), assesses and treats focal axillary hyperhidrosis at Core Aesthetics. Hyperhidrosis is treated as a medical condition rather than a cosmetic concern, with separate consent processes and separate dosing logic from cosmetic anti-wrinkle treatment. Results vary between individuals, sweating reduction onset, magnitude, and duration depend on baseline severity, sweat gland density, and individual response to the active product. The clinical content on this page is calibrated to that variability.

Specific to hyperhidrosis injections what to expect: focal axillary hyperhidrosis treatment is dosed to the individual sweat pattern, identified clinically rather than estimated. Onset is typically a few days to two weeks, magnitude varies by patient, and duration ranges from four to seven months in most cases, outliers exist on both ends. Patients should not expect identical results between treatment cycles; sweat gland response can shift modestly across years of treatment. The what to expect first filler appointment page covers related hyperhidrosis content.

Patients reading this page who want to verify Corey Anderson’s AHPRA registration can do so directly on the AHPRA public register at ahpra.gov.au using registration number NMW0001047575. The Core Aesthetics clinic operates from 12A Atherton Road, Oakleigh VIC 3166, Tuesday to Saturday, by consultation appointment. All new patient treatment at Core Aesthetics follows a structured clinical consultation, consistent with the September 2025 AHPRA cosmetic procedures guidelines. Treatment may be scheduled for the same day as consultation or at a subsequent appointment, depending on clinical assessment and individual circumstances. Patients with questions about the content on this page can raise them at consultation; the practitioner is happy to walk through any clinical reasoning that the written content does not fully capture. Results vary between individuals, and the consultation is the appropriate place to discuss what those individual variations mean for a specific person’s treatment plan.