This is quite an eye opener. I will have to check with the local medicine stores around here to see some cough syrups with NAC. I just hope it doesn't exist in combination with contents that should not be taken ordinarily or with potential side effects if used long term.
I've got a bit of concerns with the images used in your post. They don't seem to be from free sources. Can you double check to confirm the free to use feature or just replace them with free versions? You are not in any way obligated to do this but it might improve your chances of getting supported by the community account.