Methyltestosterone
Also known as: Android, Methitest, Testred, Virilon, Orandrone
### Important Information for Pet Owners * **Purpose**: This medication is a hormone used to treat specific hair loss conditions (like Alopecia X) or to manage certain reproductive issues. * **Liver Risks**: The most serious side effect is liver damage. **Blood tests are required** before starting this medication and regularly during treatment to ensure your pet's liver is handling it well. * **Behavioral Changes**: Watch for increased aggression or changes in your pet's normal behavior. * **Physical Changes**: Female dogs may develop male-like physical traits or vaginal discharge. Male dogs may develop prostate issues. * **When to Call the Vet**: Stop the medication and contact your veterinarian immediately if your pet stops eating, starts vomiting, loses weight rapidly, or if you notice a yellowing of the eyes, gums, or skin (jaundice). * **Human Safety**: Pregnant women should avoid handling this medication, as it can cause severe birth defects.
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
- Anti-estrogenic activity, anabolic effects, negative feedback on gonadotropin release
- Alopecia X (when melatonin fails)
- Testosterone-responsive dermatosis
- Suppress estrus in Greyhounds
- Estrus suppression
- Anti-estrogenic activity, anabolic effects, negative feedback on gonadotropin release
How it is given
Possible side effects
- Hepatotoxicity (elevated liver enzymes, icterus, periportal hepatocyte enlargement)
- Virilization of females (clitoral hypertrophy, vaginitis)
- Vaginal discharge
- Prostatic hyperplasia in males
- Increased aggression or behavioral changes
- Seborrhea
- Premature epiphyseal closure in young animals
Cautions & contraindications
- Hepatic dysfunction or pre-existing liver disease
- Pregnancy (Category X - causes fetal masculinization)
- Prostate cancer or severe prostatic hypertrophy
- ### Important Precautions * **Hepatotoxicity**: Chronic use is strongly associated with liver damage. Baseline and serial liver enzyme monitoring is mandatory. * **Cardiac Disease**: Use with extreme caution in patients with heart failure due to the potential for sodium and water retention. * **Growing Animals**: Prolonged use in young, growing animals can cause premature epiphyseal closure, stunting growth. * **Laboratory Interference**: Can decrease thyroxine-binding globulin, leading to decreased total T4 levels (free T4 remains unaffected).
Drug interactions
- Cyclosporine: Methyltestosterone may increase serum cyclosporine levels, potentially leading to toxicity.
- Insulin: Methyltestosterone may decrease serum glucose levels, reducing insulin requirements.
- Oral Antidiabetic Agents: May decrease serum glucose levels, increasing the risk of hypoglycemia.
- Warfarin: Methyltestosterone may increase anticoagulant effects, increasing bleeding risk.
Frequently asked questions
What is Methyltestosterone used for in pets?
### Important Information for Pet Owners * **Purpose**: This medication is a hormone used to treat specific hair loss conditions (like Alopecia X) or to manage certain reproductive issues. * **Liver Risks**: The most serious side effect is liver damage. **Blood tests are required** before starting this medication and regularly during treatment to ensure your pet's liver is handling it well. * **Behavioral Changes**: Watch for increased aggression or changes in your pet's normal behavior. * **Physical Changes**: Female dogs may develop male-like physical traits or vaginal discharge. Male dogs may develop prostate issues. * **When to Call the Vet**: Stop the medication and contact your veterinarian immediately if your pet stops eating, starts vomiting, loses weight rapidly, or if you notice a yellowing of the eyes, gums, or skin (jaundice). * **Human Safety**: Pregnant women should avoid handling this medication, as it can cause severe birth defects.
Is Methyltestosterone 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.
Worried about your pet?
Peqaboo’s AI helps you track symptoms, understand lab reports, and know when to see a vet.
Get the Peqaboo app