There are various reasons for sore throat. Few things are very common. Like acidity issues, throat infection, common cold,
Next Steps
avoid cold exposure like yoghurt, ice creams , cold water, if the sore throat is not getting normal with one antibiotics. switch to higher ones after consulting physician.
Health Tips
most of the time throat infection is due to viral etiology so antibiotics are not effective. but yes prophylactically it's given to make sure Secondary bacterial infection doesn't occud