If your dog's face and lips are swollen, she is probably having an allergic reaction to the medication. If you have access to an emergency veterinarian, you should take her in right away so that he can monitor her breathing (the throat can become swollen too) and give her a shot for the reaction.
If you do not have access to a vet, then you might be able to give her an antihistamine. See if you have anything on the shelf at home and check the internet first to find out if it is safe for dogs.
If you have nothing available, and cannot take her anywhere, watch her closely. You can also call poison control if you can inform them of which medication you gave your dog.
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