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Dr. Scott
Dr. Scott, Veterinarian
Category: Dog Veterinary
Satisfied Customers: 15168
Experience:  15 years of small animal, equine and pocket pet medicine and surgery.
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what is the dosage of sulfamethoxazole/trimethoprim 400/80

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what is the dosage of sulfamethoxazole/trimethoprim 400/80 to give a 9 month old chihuahua who weight approx 10 lbs? He is currently on prednisone and pain med for a back injury and now has very orange urine, seems constipated and has a discharge from his penis.
Hello there,

We are not allowed by law to give a specific dose for a specific animal we have not examined. The TMZ-SMP is used in dogs at 15 mg per kg every 12 hours in dogs. You should consult with your vet if possible to before starting antibiotic therapy. This site may help you:
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