Understanding Fluid Drainage in Cats with Wet FIP

It can begin subtly—perhaps your cat’s belly seems a little more rounded than usual. You might assume she is gaining weight or make a light-hearted comment about kittens.

But then you notice the changes becoming more apparent: she’s eating less, resting more, and moving with clear discomfort.

Her breathing grows heavier. Her once-alert eyes now appear tired. Then comes the veterinary visit—and the diagnosis that catches many cat owners by surprise: Wet FIP.

If you are reading this, you may be navigating this distressing situation. You may have heard about fluid accumulation and “abdominal drainage.” What does this involve? Is it advisable? Will it ease your cat’s discomfort?

This article offers a clear explanation. We will discuss what fluid drainage is, when it may be needed, and the considerations—both positive and negative.

Whether you’re at the start of your journey or already in treatment, this guide is here to support you in making informed, compassionate decisions for your cat.

What Is Wet FIP?

Feline Infectious Peritonitis (FIP) is a serious illness caused by a mutation in the feline coronavirus. Wet FIP, also known as effusive FIP, results in fluid accumulating within the abdominal cavity, the chest, or both.

This can lead to visible swelling, laboured breathing, and overall discomfort for your cat.

While FIP was once considered untreatable, antiviral treatments such as GS-441524 have changed the outlook for many cats. However, managing symptoms—especially fluid buildup—remains essential, particularly in the early stages of care.

Why Does Fluid Build Up?

Wet FIP causes inflammation in the lining of the abdomen and/or chest. As a result, fluid rich in protein begins to leak from blood vessels into these spaces.

This is more than just uncomfortable—it can place pressure on internal organs, hinder breathing, and lead to reduced appetite. For these reasons, a veterinarian may recommend fluid drainage as a short-term relief method.

What Is Fluid Drainage (Paracentesis)?

Fluid drainage—referred to medically as paracentesis (for abdominal fluid) or thoracentesis (for chest fluid)—is a procedure where a veterinarian uses a sterile needle to carefully remove the excess fluid.

This can bring immediate relief, especially if your cat is experiencing breathing difficulties or discomfort due to organ pressure. However, it is important to note that this is a supportive measure. It is not a cure. The underlying infection must still be addressed using antiviral medication such as GS-441524.

When Is It Necessary?

Your vet may recommend fluid drainage in the following situations:

• Severe abdominal swelling that hinders your cat’s ability to eat or move

• Chest fluid that is making breathing difficult

• When a fluid sample is needed to confirm diagnosis

Typically, fluid drainage is done before or during the early stages of antiviral treatment to help stabilise your cat. However, repeated procedures are discouraged, as they can increase stress, reduce protein levels, and cause other imbalances.

Pros and Cons of Fluid Drainage

Benefits:

• Quick relief from major symptoms

• Improved comfort, allowing better mobility, breathing, and appetite

• Provides samples that assist in diagnosis

Considerations:

• Fluid often returns unless antiviral treatment is started

• There is a risk of infection or stress due to the procedure

• Loss of essential protein, which can impact recovery

Most experienced veterinarians and long-time FIP caregivers agree: only proceed with drainage when absolutely necessary, and prioritise timely antiviral treatment for long-term improvement.

What Happens During the Procedure?

To ensure comfort, your cat may be given light sedation or gentle calming techniques. The vet will insert a sterile needle or catheter into the abdomen or chest and slowly draw out the fluid using a syringe or collection bag. The process generally takes between 10 to 30 minutes.

Your cat will likely feel some relief immediately after the procedure. However, it is important to monitor closely for any reaccumulation or side effects.

What to Expect Afterward

It’s not uncommon for cats to seem livelier and more interested in food post-drainage—this is a positive sign. Still, without antiviral treatment, the fluid will likely return.

You may also observe:

• Increased thirst or urination

• Temporary fatigue for a few hours post-procedure

• Slightly reduced appetite (usually short-lived)

Stay in regular contact with your veterinarian and observe your cat closely over the following 24 to 48 hours. This period is vital for monitoring and adjusting treatment plans if necessary.

Final Thoughts

If your cat has been diagnosed with Wet FIP, it’s natural to feel overwhelmed. The presence of fluid in the body can be alarming, but with the right support and treatment, there is hope.

Drainage can provide short-term comfort and stability, giving your cat a better chance to benefit from antiviral therapy.

Never hesitate to ask your veterinarian for clarification, or to seek a second opinion. You are your cat’s strongest advocate.

Many pet parents have found support and practical advice through local veterinary communities and international support groups, such as CURE FIP GCC on Facebook.

Your cat is fortunate to have your care.

Speak with a treatment expert today to find the most appropriate GS-441524 protocol for your cat.

If you found this guide helpful, please consider sharing it with other cat parents in the region. A single informed choice can change a life.