Would like to suggest to you, you may want to try buying the OSIM pillow which can cure the soring.
I just bought one for my dad, seems like is working great for him as i did check with my mum, like no sounds from him liao.hahah..
No harm trying as no medication is needed.
Price is around $199 but if you have ABN credit card, you will entitle $100 off. So only cost you $99. I think is worth trying if it really works.