My horse was diagnosed with EPM last year. We tried Baycox for one month--no change. Since then, he has been on a daily dosage of sulfadiazine/pyrimethamine combination (SDZ/PYR) for approximately nine months. Would it be advisable to give him Marquis and SDZ/PYR together? One veterinarian says yes, another no. Also, isn't staying on the SDZ/PYR indefinitely compromising his

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