Sounds like a respiratory infection.
You can use Tetracycline antibiotics from the petstore. (Most big box pet stores have it)
Its found in the fish section in a box of 10 packets and runs about $12-15 depending on the store. (Feed stores have a similar antibiotic)
The dosage is 1 pack for a 16oz water bottle. Mix water in and offer it to the rat ad-lib.
Change water daily for the first week. Then after that, you can change it every other day or so. If it's minor to intermediate, RI/illness will go away in about 7-14 days. If it's in advanced stage RI, it may not help.
Water can be substituted for Pedialyte.
I get this one and was actually advised to me by a vet friend of mine.
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