蒂巴因（Thebaine）是一种鸦片类异喹啉族生物碱。

无色斜方矩形片状结晶。几乎不溶于水，稍溶于乙醚、石油醚，溶于乙醇、氯仿、苯、吡啶。1g溶于1460ml水中(15℃)，15ml热乙醇，13ml氯仿，200ml乙醚，25ml苯，12ml吡啶。

有毒，毒性比吗啡大，药理作用与吗啡相反，它的痉挛毒性超过麻醉作用， 对冷血动物是兴奋反射。在英国和美国受到管制。

由蒂巴因可制得羟考酮、****、纳络酮、纳布啡、羟吗啡酮和埃托啡等药物。

Thebaine (paramorphine), also known as codeine methyl enol ether, is an opiate alkaloid, its name coming from the Greek Θῆβαι, Thēbai (Thebes), an ancient city in Upper Egypt. A minor constituent of opium, thebaine is chemically similar to both morphine and codeine, but has stimulatory rather than depressant effects. At high doses, it causes convulsions similar to strychnine poisoning. The synthetic enantiomer (+)-thebaine does show analgesic effects apparently mediated through opioid receptors, unlike the inactive natural enantiomer (−)-thebaine. Thebaine is not used therapeutically, but as the main alkaloid extracted from Papaver bracteatum (Iranian poppy), it can be converted industrially into a variety of compounds including oxycodone, oxymorphone, nalbuphine, naloxone, naltrexone, buprenorphine and etorphine. Butorphanol can also be derived from thebaine and is scheduled separately from butorphanol derived by other processes.