Chow chow symptoms and conditions

Zyloprim was prescribed for my dog a Chow Chow sick with Leishmaniasis. Within five days of starting her on the drug it nearly killed her. I started her on it on Tuesday, April 15. Within about two days,she quit eating, began drinking huge amounts of water and became progressively weaker. I had bad feelings about what was happening and I quit giving her the Zylopim on either Friday evening or Saturday morning. On Saturday evening she was so weak she could barely walk out of the kennel or stand. She got progressively weaker Sunday. By Sunday evening, I did not think she would survive until morning. She became so weak that she could not stand or sit or even lift her head. I had to give her water by holding her head up and using a syringe. On MOnday morning I was very surprised that she was still alive and now could hold her head up but had no eneregy and could barely stand up. It took a full week (until Sunday April 27)from Sunday for her to get back to where she was before she started receving the drug. She also developed a huge open leison on one elbow and I noted she developed open sores and a discharge from several of her nipples. Literature on Leishmaniasis said to give 20 mg /kg a day. She weighed about 41 lbs (use to weigh about 60 lbs before the Leismaniasis made her sick). I will have to check the bottle. She may have been overdosed