Hi,
Thanks for writing in.
Scratching sensation in throat after antibiotics may occur due to dryness in the mucosa of the throat. Another reason might be the persistence of mild viral
sore throat in you. Salt water gargling can help you to soothe the throat. Drink warm fluids and avoid iced drinks for a while. You may take antihistamine tablets. Some of them may cause slight
drowsiness.
Hope this helps