Thioguanine
Also known as: Tabloid, Lanvis, Tioguanina
This medication is a powerful chemotherapy drug used to treat certain types of leukemia. Because it is a potent drug, it requires careful handling and close monitoring. * **Safe Handling:** Wash your hands thoroughly after administering the medication. Do not break or crush the tablets. Pregnant women, nursing mothers, and immunocompromised individuals should avoid handling this drug or the pet's waste. * **Waste Management:** Your pet's bodily fluids (urine, feces, vomit) may contain traces of the drug for a few days after administration. Wear gloves when cleaning up accidents and wash hands afterward. * **What to Watch For:** Contact your veterinarian immediately if your pet shows signs of abnormal bleeding, bruising, severe loss of appetite, vomiting, diarrhea, yellowing of the eyes/gums (jaundice), or signs of infection (like fever or extreme lethargy). * **Appointments:** Keep all scheduled appointments for blood tests. These are mandatory to ensure the drug is not damaging your pet's bone marrow or liver.
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
What it is used for
- Acute lymphocytic and granulocytic leukemia
- Acute lymphocytic and granulocytic leukemia
- Acute myelogenous leukemias (Protocol 1 & 2)
How it is given
Possible side effects
- Nausea
- Anorexia
- Vomiting
- Diarrhea
- Bone marrow suppression (leukopenia, thrombocytopenia, anemia)
- Hepatotoxicity
- Pancreatitis
- Gastrointestinal ulceration (including oral ulcers)
- Dermatologic reactions
Cautions & contraindications
- Hypersensitivity to thioguanine
- Pregnancy (Category D - teratogenic and mutagenic)
- > **Strict Chemotherapy Safety Precautions Apply** * **Hepatic/Renal Impairment:** Use with extreme caution; dosage adjustments may be necessary. * **Pre-existing Conditions:** Caution in patients with pre-existing bone marrow depression, active infections, or a history of urate urinary stones. * **Species Sensitivity:** Cats are highly susceptible to hematologic toxicity. * **Reproduction:** Potentially mutagenic and teratogenic. Do not use in pregnant animals. Nursing mothers should use milk replacer. * **Handling:** Personnel and owners should follow safe handling protocols for cytotoxic drugs.
Drug interactions
- Hepatotoxic drugs (e.g., halothane, ketoconazole, valproic acid, phenobarbital, primidone): Increased risk of hepatotoxicity; use concurrently with caution.
- Immunosuppressive drugs (e.g., azathioprine, cyclophosphamide, corticosteroids): Increased risk of severe infection due to additive immunosuppression.
- Myelosuppressive drugs (e.g., chloramphenicol, flucytosine, amphotericin B, colchicine): Additive bone marrow depression; extreme caution required.
- Live vaccines: Increased risk of vaccine-induced infection or decreased vaccine efficacy; use with caution or avoid.
Frequently asked questions
What is Thioguanine used for in pets?
This medication is a powerful chemotherapy drug used to treat certain types of leukemia. Because it is a potent drug, it requires careful handling and close monitoring. * **Safe Handling:** Wash your hands thoroughly after administering the medication. Do not break or crush the tablets. Pregnant women, nursing mothers, and immunocompromised individuals should avoid handling this drug or the pet's waste. * **Waste Management:** Your pet's bodily fluids (urine, feces, vomit) may contain traces of the drug for a few days after administration. Wear gloves when cleaning up accidents and wash hands afterward. * **What to Watch For:** Contact your veterinarian immediately if your pet shows signs of abnormal bleeding, bruising, severe loss of appetite, vomiting, diarrhea, yellowing of the eyes/gums (jaundice), or signs of infection (like fever or extreme lethargy). * **Appointments:** Keep all scheduled appointments for blood tests. These are mandatory to ensure the drug is not damaging your pet's bone marrow or liver.
Is Thioguanine safe for my pet?
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.
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