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Did Doppler get the medications on an empty stomach or did you give it to him with some food?
Thank you for the additional information. Many dogs do get upset stomachs taking antibiotics (cephalexin) and antifungals (ketoconazole). It is a bit unsual that he threw up many hours after taking the medications, so it is not clear if they were directly connected. To be safe, you may want to skip his evening doses and start again in the morning if he is otherwise feeling well. If he vomits again, you may need to talk to your vet about modifying the dose or switching medications.