Levothyroxine Sodium 25 mcg for Cat

Thyroid Hormone Replacement for Feline Hypothyroidism

Levothyroxine Sodium 25 mcg Tablets are prescribed for cats diagnosed with hypothyroidism. This synthetic T4 hormone replaces insufficient natural thyroid hormone and helps restore normal metabolic function. Hypothyroidism in cats is uncommon but requires lifelong medical management when diagnosed.

What Is Levothyroxine Used For in Cats?

Levothyroxine Sodium is indicated for:

• Primary hypothyroidism
• Congenital thyroid deficiency
• Iatrogenic hypothyroidism (post hyperthyroid treatment)
• Thyroid gland damage

It restores circulating T4 levels to support normal metabolism.

Signs of Hypothyroidism in Cats

Your veterinarian may prescribe levothyroxine if your cat shows:

• Lethargy
• Weight gain without increased appetite
• Poor coat quality
• Hair thinning or slow regrowth
• Cold intolerance
• Slow heart rate

Diagnosis is confirmed through blood testing (T4, TSH).

How Levothyroxine Works

Levothyroxine is synthetic thyroxine (T4). After oral administration:

• It is absorbed into the bloodstream
• Converted into active T3 hormone
• Regulates metabolism at the cellular level
• Restores normal thyroid hormone balance

Consistent dosing is essential for stable hormone levels.

Key Benefits

• Restores normal metabolic rate
• Improves energy and activity
• Supports healthy coat and skin
• Helps regulate body weight
• Long-term thyroid management

Dosage Guidelines (General Reference Only)

Always follow veterinary prescription.

Typical Starting Dose

• 0.02 mg/kg body weight
• Given once or twice daily
• Dose adjusted based on blood testing

Routine T4 monitoring is required after starting therapy.

Administration Instructions

• Give orally
• Administer on an empty stomach
• Ideally 30 minutes before food
• Give at the same time daily
• Do not skip doses

Consistency improves hormone stability.

Monitoring During Treatment

Cats on levothyroxine require:

• Blood T4 testing 4–6 weeks after starting
• Dose adjustments as needed
• Periodic thyroid level checks long-term

Never adjust dose without veterinary guidance.

Possible Side Effects (Usually Dose-Related)

If dosage is too high, signs may include:

• Increased thirst
• Increased urination
• Increased appetite
• Weight loss
• Restlessness
• Elevated heart rate

Contact your veterinarian if symptoms occur.

Serious Overdose Signs (Seek Veterinary Care)

• Rapid heart rate
• Severe agitation
• Tremors
• Vomiting
• Labored breathing

Use With Caution In Cats With:

• Heart disease
• Kidney disease
• High blood pressure

Close monitoring is required in these cases.

Product Details

FAQ 

What is Levothyroxine 25 mcg used for in cats?
It treats hypothyroidism by replacing deficient thyroid hormone.

Is hypothyroidism common in cats?
It is rare but can occur after thyroid treatment or congenital disease.

How long does my cat need levothyroxine?
Most cases require lifelong treatment with regular monitoring.

Can levothyroxine cause side effects?
Yes, especially if overdosed. Monitoring prevents complications.