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Not unless it is prescribed by a vet, or is being used to save mom's life. You really need to see the vet to get a better medication.
Let me know if you want to discuss this more.
Yes. Mastitis can be fatal if left untreated. The reason is that the breast can rupture because of the infection and then the infection becomes systemic.
You need to see the vet to get a diagnosis and to discuss your treatment options since she is nursing.