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Contraindications include current, past or suspected breast cancer, known or suspected estrogen-dependent malignant tumours, previous idiopathic or current venous thromboembolism, known coronary heart disease, and porphyria cutanea tarda (absolute contraindication).
Contraindications to Dexamethasone. The drug is contraindicated in dogs suffering from a bacterial, viral or fungal infection unless they are taking medications to treat the existing infection. Dexamethasone is also contraindicated in animals that are allergic to the drug.The drug shouldn't be given to pregnant or lactating dogs or to pets suffering from heart disease, diabetes, liver disease or osteoporosis.he drug is contraindicated in dogs suffering from a bacterial, viral or fungal infection unless they are taking medications to treat the existing infection. Dexamethasone is also contraindicated in animals that are allergic to the drug.