My sister has metastatic breast cancer that has spread to several organs including her stomach. She currently has a j tube for feeding to her small intestine. The doctor has prescribed marinol. My sister took a dose and didn't see any effects - so she went back to another medication for pain and nausea. Wasn't sure if the level of marinol in her blood had to reach a certain level - would she need to take for several days before seeing any positive effects.