Canker sore on the throat and got prescribed magic mouthwash, what to do?

Self limited pain: Canker sores will resove with or without treatment in 7 - 10 days. May take another week for complete healing. "magic mouthwash" is a compounded solution by a pharmacist - can have any number of ingredients. That's all you need, perhaps anti-inflammatory meds for residual pain. It will heal on it's own. If symptoms persist, it's not a canker sore - see your oral surgeon.

Tincture of time: Canker sores are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The recurrent aphthous ulcers is usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned see your dentist after 10 days or visit today for laser immediate amelioration.