I'm not an expert at this (MrsD would know more), but Codeine is not nearly as strong as pain meds like Percocet (Oxycodone). I doubt 30 mg of Tylenol 3 is even equal to 5 mg of Percocet. Therefore, I'm not surprised it didn't help.

But like you said, finish the 5 days and go back for the next suggestion (Gabapentin).

I'm glad you got some relief from the compound...something is better then nothing.