Thyro-Tabs (Levothyroxine Sodium) for Dogs, 0.5 mg

Mid-Range T4 Replacement Tablet for Hypothyroid Dogs

Product Description

Thyro-Tabs Canine (Levothyroxine Sodium Tablets, USP) 0.5 mg is an FDA-approved prescription thyroid hormone replacement for dogs, supplied in white scored oval tablets in bottles of 120 or 1,000. Each tablet delivers 0.5 mg levothyroxine sodium, a synthetic T4 that matches the molecular structure of a dog's naturally produced thyroid hormone. Sitting at the mid-range of the nine-strength Thyro-Tabs Canine line, this strength suits medium-sized dogs or those whose bloodwork guides the vet toward this specific dose. Indicated for replacement therapy of diminished thyroid function in dogs.

Benefits

• Addresses Mid-Range Dosing Needs: Positioned at the midpoint of the Thyro-Tabs Canine strength range, the 0.5 mg tablet bridges the gap between lower and higher daily T4 requirements.
• Clinically Validated Effectiveness: A controlled US field study showed 75.6% of evaluable dogs reached treatment success, with TT4, fT4, and TSH levels normalized by Day 182.
• Visible Symptom Improvement: Hypothyroid clinical signs including weight gain, lethargy, hair thinning, skin changes, and elevated blood cholesterol generally improved during the field study.
• Flexible Dosing Schedule: Administered as a single daily oral dose every 24 hours, or split into two equal doses 12 hours apart based on the prescribing vet's recommendation.
• Score Line for Easy Splitting: The white oval tablet is scored down the middle, allowing the vet or owner to split it cleanly when the prescription requires a half-tablet amount.
• Consistent Potency Guaranteed: Thyro-Tabs Canine is manufactured under the same FDA standards as the human levothyroxine product, ensuring reliable potency in every tablet.

Ingredients

Active Ingredients

Levothyroxine Sodium (Anhydrous): 0.5 mg per tablet

How to Use

Dosage and Administration Instructions

• Prescription Required: Federal (USA) law restricts Thyro-Tabs Canine to use by or on the order of a licensed veterinarian only.
• Initial Daily Dose: Start at 0.1 mg per 10 lbs (0.022 mg/kg) once daily every 24 hours, or split evenly into two doses every 12 hours as the vet directs.
• Post-Dose Blood Sampling: TT4 levels drawn 4-6 hours after the tablet most accurately reflect the drug's peak absorption for guiding dose decisions.
• Recheck Every 4-8 Weeks: Until a stable maintenance dose is confirmed, schedule clinical reassessments and TT4 monitoring at 4 to 8 week intervals.
• Same Time Daily: Give the tablet at the same time every day; consistent timing helps keep serum T4 levels predictable between monitoring appointments.
• Food Consistency Matters: Whether the tablet is given with or without food, keep that pattern the same every day to prevent day-to-day variability in T4 absorption.
• Ongoing Lifelong Treatment: Most hypothyroid dogs need levothyroxine indefinitely; discuss any plan to stop or change the medication with the veterinarian first.

Disclaimer: This dosage information is provided by the manufacturer. Always consult your veterinarian before administering or adjusting any supplement for your pet.

Additional Information

Precautions

• Contraindicated in Thyrotoxicosis: Never give Thyro-Tabs to a dog already showing signs of excess thyroid hormone or with a confirmed thyrotoxicosis diagnosis.
• Adrenal Function Check First: Unresolved adrenal insufficiency must be corrected before starting thyroid hormone replacement to avoid triggering an adrenal crisis.
• Heart Disease Requires Care: Dogs with underlying cardiac disease need especially close monitoring as their metabolic rate increases in response to levothyroxine supplementation.
• Breeding and Reproductive Status: The safety of Thyro-Tabs in breeding dogs, pregnant bitches, or lactating mothers has not been determined; seek veterinary guidance before use.
• Secure from Children and Pets: Keep the bottle locked away from children and all household animals to prevent accidental access to these thyroid tablets.

Possible Side Effects

• Skin Itching: Pruritus is the most frequently documented adverse reaction in the post-approval adverse drug experience data for Thyro-Tabs Canine in dogs.
• T4 Outside Target Range: Serum TT4 concentrations falling above or below the therapeutic range are among the most commonly reported post-approval findings; regular testing is key.
• Digestive Disturbances: Vomiting, diarrhea, and appetite loss have been documented in both the controlled field study and through ongoing post-approval adverse event submissions.
• Increased Thirst and Urination: Polydipsia and polyuria have appeared in post-approval reports; inform the vet if the dog is drinking or urinating noticeably more after starting treatment.
• Elevated Liver Values: Three dogs in the field study developed raised ALP, ALT, or AST levels; two normalized spontaneously without stopping the medication mid-study.
• Allergic Skin Reactions: Rare hypersensitivity reactions including urticaria and facial swelling alongside alopecia, seborrhea, and dermatitis have been noted in post-approval experience.

Storage Information

• Room Temperature Only: Store at 20-25°C (68-77°F); brief excursions between 15-30°C (59-86°F) are acceptable and will not compromise tablet quality or potency.
• Away from Light and Moisture: Keep the bottle tightly closed and away from direct light and humidity to protect levothyroxine sodium stability over time.

Shipping & Return

We offer ground, express, and priority delivery; see our shipping policy for details.

For return instructions or product concerns, please refer to our detailed refund policy.

Prescription items are NON-RETURNABLE and NON-REFUNDABLE.

Frequently Asked Questions

Q1: What is Thyro-Tabs Canine 0.5 mg used for in dogs?

Ans: Thyro-Tabs Canine 0.5 mg is an FDA-approved prescription oral T4 replacement for dogs with hypothyroidism. It provides synthetic levothyroxine sodium identical in structure to the hormone a healthy canine thyroid produces, restoring normal metabolic activity when the gland can no longer do so on its own.

Q2: Why is the Thyro-Tabs 0.5 mg white tablet considered a mid-range strength?

Ans: Thyro-Tabs Canine is available in nine strengths from 0.1 mg through 1.0 mg. The 0.5 mg white tablet sits at the middle of this range, making it the typical starting point for medium-sized dogs whose initial weight-based calculation or early bloodwork places their daily T4 need around this level.

Q3: How long after giving the levothyroxine tablet should blood be drawn to check T4 levels?

Ans: Blood for serum TT4 monitoring should be drawn 4 to 6 hours after the dose is administered, as this timing reflects peak drug absorption and gives the most accurate picture of whether the current dose is delivering the right level of thyroid hormone supplementation for the dog.

Q4: Does a diabetic dog on insulin need special monitoring when starting Thyro-Tabs levothyroxine?

Ans: Yes. Levothyroxine replacement affects glucose metabolism, which may shift how much insulin a diabetic dog needs to stay regulated. Once thyroid therapy begins, insulin dosing should be monitored closely by the veterinarian and adjusted based on regular blood glucose assessments throughout the treatment period.

Q5: Can the Thyro-Tabs 0.5 mg white tablet be split in half for my dog?

Ans: Yes. The 0.5 mg tablet is scored, allowing it to be split cleanly in half when the prescribed amount calls for a partial tablet. Any splitting should follow the veterinarian's specific instruction, as the correct dose is based on the dog's individual body weight and monitored TT4 response.

Clinical Research

https://www.msdvetmanual.com/endocrine-system/the-thyroid-gland/hypothyroidism-in-animals

https://www.petmd.com/dog/conditions/endocrine/c_dg_hypothyroidism

https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=38005382-289a-4293-b58e-b1cda8bc228