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Most antibiotics kick in within72 hrs if they are the right one to treat the specific infective organism. You need a full 7-10 day treatment usually. If still running fever above 100 after 3rd day, I would recheck with your doctor. Keflex is a broad spectrum antibiotic but if in any doubt see your physician.

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12y ago
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9y ago

Cephalexin is good for one year after you get it prescribed. The bottle should have an expiration date on it or a date when to throw it away.

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11y ago

10 days

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15y ago

10 days.

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Q: How long is cephalexin good for?
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