How Long Does the Allurion Balloon Stay in Your Stomach?

One of the first practical questions people ask about the Allurion Gastric Balloon is straightforward: how long does it stay in?

The answer is approximately 16 weeks — but understanding what happens across the full programme timeline helps set realistic expectations and makes it easier to plan around the process.

The Balloon Phase: 16 Weeks

The Allurion Balloon is swallowed as a capsule attached to a thin catheter. Once in the stomach, it is filled with approximately 550ml of fluid through the catheter, which is then removed. The entire placement process takes around 15 minutes as an outpatient visit.

From that point, the balloon remains in the stomach for approximately 16 weeks. During this period, it occupies space in the stomach, creates a persistent feeling of fullness, and supports reduced portion sizes as part of the dietary programme.

The 16-week duration is not arbitrary. Clinical data shows that this timeframe is sufficient to support meaningful weight loss while giving patients enough time to establish lasting dietary habits. It also aligns with the balloon’s natural material tolerance — designed to maintain integrity across that period before a controlled deflation.

How the Balloon Leaves the Body

This is where the Allurion Balloon differs fundamentally from every other gastric balloon on the market.

There is no removal procedure. No endoscopy, no sedation, no hospital visit.

The balloon contains a time-activated release valve. At approximately the 16-week mark, this valve opens automatically, and the fluid inside the balloon drains into the stomach and is absorbed by the body. The deflated balloon — now a small, flexible shell — then passes through the digestive system naturally and is excreted.

Most patients are not aware of the moment of deflation. Some notice a change in the feeling of fullness over a day or two. The passage of the balloon typically occurs within a few days of deflation and is painless.

The Full Programme: Six Months

While the balloon itself is present for 16 weeks, the Allurion programme runs for a full six months. This is an important distinction.

The balloon phase provides the physical support — reduced stomach capacity, earlier satiety, a structured reduction in food intake. The two months following balloon passage are equally important: this is when the dietary and behavioural habits established during the balloon phase are reinforced without the physical support of the device.

The six-month programme at Ottawa Health Center includes:

• Dietary guidance for each phase — from the initial liquid diet through soft foods and into full nutritional eating
• Nutritional coaching and check-ins throughout the programme
• Behavioural support to address eating patterns, portion awareness, and long-term habit formation
• Monitoring of weight loss progress and adjustment of the programme as needed
• Access to the medical team throughout for side effect management and clinical queries

Research consistently shows that patients who complete the full programme — including the post-balloon coaching phase — maintain significantly more of their weight loss at 12 months than those who treat the balloon as a standalone device.

Week-by-Week: What to Expect

Weeks 1–2: Adjustment

The stomach adapts to the balloon. Side effects including nausea, cramping, and reduced appetite are most pronounced in this period. Dietary intake is liquid-based, transitioning to soft foods. Most patients find this the most challenging part of the programme.

Weeks 3–8: Establishing the Pattern

Side effects resolve and appetite reduction becomes a functional tool rather than a source of discomfort. Portion sizes are naturally smaller. Weight loss is typically most rapid in this phase as the combination of caloric reduction and the balloon’s physical effect works consistently.

Weeks 9–16: Active Weight Loss Continues

The body continues to lose weight, though the rate typically moderates from the early phase. Dietary habits are becoming established. Patients are eating consistently smaller, more nutritious meals and building the patterns the programme is designed to sustain.

Around Week 16: Balloon Deflation

The balloon deflates automatically. Most patients notice a gradual change in the feeling of fullness over a few days. The deflated balloon passes naturally within days. A follow-up appointment confirms passage and assesses progress.

Weeks 17–26: Consolidation Phase

The two months after balloon passage are focused on reinforcing the habits built during the balloon phase. Without the physical support of the balloon, this period tests whether those habits have genuinely taken hold — and the coaching provided is specifically designed to support that transition.

Results at Six Months and Beyond

Clinical data from more than 1,770 patients across 24 countries shows average total body weight loss of 10–15% over the Allurion programme. At 12 months — six months after the programme ends — 95% of patients maintain their weight loss when the full programme is completed.

The 16-week balloon is the catalyst. The six-month programme is the foundation.

For Ottawa residents considering the Allurion programme, a free consultation with our medical team is the right starting point. We will assess your eligibility, walk through the full timeline, and answer any questions about what the process involves in practice.

What Happens if the Balloon Deflates Early

Early deflation — before the expected 16-week mark — is uncommon but can occur. Patients are given a small amount of contrast agent at placement so that early deflation can be identified on a simple X-ray if symptoms suggest it has occurred.

The most common sign of early deflation is a sudden change in the feeling of fullness — a noticeable reduction in the satiety effect that the balloon had been providing. If you experience this, contact the Ottawa Health Center team promptly.

If early deflation is confirmed, your medical team will discuss options including a new balloon placement, depending on where you are in the programme timeline and your individual circumstances.

Planning Around the Programme

Knowing the timeline in advance allows you to plan practically. Placement is a 15-minute outpatient appointment with no fasting required and no time off work necessary beyond the day itself. The first two weeks involve dietary restrictions and some side effect management, so scheduling placement during a period without significant social or professional demands can make the adjustment period easier.

The follow-up appointments are spaced at regular intervals and are designed to fit around normal working and family commitments. Most Ottawa patients manage the full programme alongside full-time work without significant disruption.