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Description:
Methimazole Spot-On for Cats (MSO)
This is a prescription medication. Before purchasing it, your veterinarian must have issued a prescription. Always give as directed by your veterinarian. Keep out of reach of children and pets, and store as directed. This information is not intended to replace advice from your veterinarian.
MSO™ Methimazole Transdermal Gel 100 mg/mL
Indication: For the treatment of hyperthyroidism in cats. Hyperthyroidism is a condition in which the thyroid gland produces excessive thyroid hormone (T4). Methimazole, the active ingredient, reduces the amount of T4 hormone produced by the thyroid gland. This treatment is not a cure but can control the condition when administered daily for the remainder of the cat’s life.
Active Ingredient:
- Methimazole 100 mg/mL (10% w/v)
- Also contains NMP 1–10% w/v
Dosage and Administration:
- As directed by your veterinarian, apply the prescribed dose to the inside of the pinna (the inner hairless part of the ear).
- Apply using a glove or finger cot as supplied. Avoid skin contact.
- Administer at a consistent time each day.
- If you miss a dose, apply it as soon as possible. Do not double dose to make up for a missed application.
- Adjustments to the dose should be made based on thyroid hormone level (TT4) and clinical signs under veterinary guidance.
Storage:
- Store below 25°C in the original container.
- Protect from light.
- Replace the cap between applications.
Handling Precautions:
- Avoid skin and eye contact. Methimazole may cause skin irritation or eye irritation.
- Methimazole may damage fertility or the unborn child from repeated exposure.
- Wear waterproof gloves and wash hands thoroughly after use.
- Keep young children away from treated animals for at least one hour after application to avoid accidental drug exposure.
Adverse Effects: Side effects may occur, particularly within the first three months of treatment, and can include:
- Vomiting, lack of appetite, or depression
- Liver issues, including yellowing of gums or skin
- Skin irritation from scratching
- Severe allergic reactions
If any of these effects are observed, contact your veterinarian immediately.
Disposal: Dispose of used applicators and gloves in the garbage by wrapping them in paper.
Restricted Veterinary Medicine – Available only under Veterinary Authorisation.
ACVM Registration Number: A10271
Active Ingredient:
Each pack contains 3x 1 ml syringes of 100mg/ml Methimazole.
Additional Information:
Managing Hyperthyroidism in Cats
Hyperthyroidism is a common condition in older cats, caused by an overactive thyroid gland producing too much thyroid hormone. Here’s how to manage it effectively after your vet prescribes treatment:
1. Administer Treatment Correctly
Follow your vet’s instructions precisely when applying the prescribed medication. Consistency is key—apply it at the same time every day. Wear gloves when handling medication and avoid petting the application site for a few hours.
2. Monitor Your Cat's Health
Keep an eye on your cat’s behavior and energy levels. Watch for signs like increased thirst, appetite, or weight loss. These may indicate the medication needs adjustment. Regular vet checkups are essential to monitor thyroid levels and adjust treatment as needed.
3. Dietary Considerations
Your vet may recommend a special diet for your cat. A low-iodine diet can help manage hyperthyroidism, as iodine influences thyroid hormone production.
4. Regular Blood Tests
Routine blood tests are crucial to track your cat’s thyroid hormone levels and overall health. Expect to visit the vet for blood work every few months, especially in the beginning.
5. Maintain a Stress-Free Environment
Hyperthyroid cats can be more anxious or restless. Create a calm, quiet space for your cat, and minimize stress to help them feel secure and comfortable.
6. Monitor for Side Effects
Be alert for any side effects, such as vomiting, lethargy, or facial itching, and report these to your vet right away.
7. Stick to the Plan
Hyperthyroidism is a manageable condition, but it requires long-term care. Stay consistent with medication, vet visits, and diet adjustments for the best results.
- Pet
- Cat
- Product Form
- Topical Liquid/Cream
- Delivery Method
- Topical
- Availability
- Prescription Only