Hi, I can help you with your question today.
It is possible that it could be related to her cancer, but I don't think that is very likely.
You can use a warm compress on her eye for 5 minutes at a time, several times a day if she will tolerate it.
You can also try a dose of Benadrul.
Do you know about how much she weighs?
You can give her 1/4 tablet of Benadryl every 8-12 hours.
If it resolves the swelling, continue for another 3 doses after she looks normal.
No, you can use over the counter medication.
I think it might go by the brand name Nytol in the UK.
The active ingredient in the pills is 25 mg diphenhydramine.
Her dose would be 6.25mg (1/4 tablet)
The medication is an antihistamine, but is used commonly as a sleep aid because of the side effect of drowsiness.
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