Wow, that's an impressive link,
jhm!
I imagine your wife is using a fentanyl (Duragesic) transdermal patch. As "3-Methyl fentanyl" is listed in Appendix A, I think we can assume you will need to apply for a controlled substance permit. Hopefully you can FAX this request and the process will not be too painful. In my trips to SIN, I've never had my luggage searched, but why take a chance. After travelling 10,000 miles to attend a SIN DO, arriving on UA at midnight, you hardly want to discuss pharmacology with customs.