My dog is vomiting, lethargic after cephalexin. Allergic reaction?

Question

I have my 80 lb, 12 yr old dog her first dose of cephalexin 500mg. She's lethargic, had diarrhea, vomited, and will not eat. Could she be allergic? Pet's info: Dog | German Shorthaired Pointer | Female | spayed | 80 lbs

Dr. Melanie, BVSc MS · Accepted Answer

Usually cephalexin is well tolerated by dogs, but it can cause nausea, vomiting, and diarrhea. This can be alleviated by giving Molly her medication with food, but to be safe, I'd give your vet a call to let them know she is having these side effects. They made decide to have you stop giving it, and may want to try a different medication. I'd give your vet a call now. Best of luck.

My dog is vomiting, lethargic after cephalexin. Allergic reaction?

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