The First 14 Days of FIP Injection Treatment: What to Expect

What to Expect

FIP injection treatment is one of the most effective ways to manage Feline Infectious Peritonitis. The first 14 days are especially critical, as they often determine how well your cat responds to treatment.

Although this phase can feel stressful, understanding what to expect will help you stay calm and confident throughout the process.

Day 1–3: Starting FIP Injection Treatment

Early Reactions During FIP Injection Treatment

At the beginning of injection treatment, your cat may show mild reactions.

For example:

  • Slight swelling or tenderness at the injection site
  • Temporary lethargy or sleepiness

These reactions are usually normal and short-term.

Appetite and Behaviour

During the first few days, appetite may vary.

  • Some cats start eating better
  • Others may hesitate to eat

Therefore, you should encourage feeding with wet food or favourite treats.

Monitoring Side Effects

In addition, mild side effects may appear:

  • Slight drop in energy
  • Mild vomiting or diarrhea

However, these symptoms usually resolve quickly. If they persist, consult your veterinarian.

Day 4–7: Early Progress in FIP Injection Treatment

Signs of Improvement

By this stage, FIP injection treatment may start showing early results.

For instance:

  • Slight increase in activity
  • More interaction with surroundings

Although progress may be gradual, these are positive signs.

Reduction in Symptoms

At the same time:

  • Fever may begin to decrease
  • Fluid buildup (wet FIP) may reduce
  • Inflammation may improve

As a result, your cat may look more comfortable.

Appetite Recovery

Many cats begin eating more regularly during this phase.

Therefore, improved appetite is often a key sign that treatment is working.

Day 8–10: Turning Point of FIP Injection Treatment

Visible Improvements

By day 8 to day 10, FIP injection treatment often reaches a turning point.

You may notice:

  • Increased energy
  • More normal behaviour
  • Improved interaction

Symptom Reduction

In addition:

  • Neurological symptoms may reduce
  • Swelling continues to decrease
  • Overall condition stabilises

However, you should continue monitoring closely.

Watching for Side Effects

Although most side effects remain mild, stay alert for:

  • Persistent vomiting
  • Severe diarrhea
  • Lack of movement

If these occur, contact your vet immediately.

Day 11–14: Strong Recovery Phase

Energy and Behaviour Improvements

During this stage, FIP injection treatment usually shows stronger results.

Many cats:

  • Become more playful
  • Explore their environment
  • Show curiosity again

As a result, they start returning to normal behaviour.

Stabilising Health

At the same time:

  • Fever subsides
  • Appetite improves
  • Breathing becomes easier (wet FIP cases)

Therefore, this stage often confirms that treatment is working.

What to Watch During FIP Injection Treatment

Important Monitoring Tips

Throughout the first 14 days of FIP injection treatment, you should monitor:

Injection site:

  • Mild swelling is normal
  • Severe inflammation needs attention

Symptoms:

  • Watch for relapse signs
  • Track behaviour changes

Eating and drinking:

  • Ensure consistent intake
  • Support feeding if needed

As a result, early detection of issues helps prevent complications.

Final Thoughts on FIP Injection Treatment

FIP injection treatment requires patience, consistency, and close monitoring. While the first 14 days may feel uncertain, many cats begin to show clear improvement by the second week.

In conclusion, stay consistent with treatment, monitor progress closely, and seek support when needed. Most importantly, every small improvement is a step toward recovery. Shop with us to get more info detail about injection now. 

Back to blog