Hello, Short answer: Yes, Duromine drug can cause nausea. Detailed answer: Duromine, containing phentermine, is one of the oldest diet pills in the market. It is similar to amphetamine, chemically speaking. Its administration is associated with numerous side effects, including gastrointestinal problems (nausea and vomiting), cardiovascular effects, changes of libido (sexual desire), pulmonary hypertension, central nervous system disturbances (including but not limited to psychotic episodes), sleep disturbances, eye problems, urinary problems, etcetera. Therefore, you have done the right thing to stop taking the drug. Because Duromine is giving you considerable nausea, than probably you should not take it anymore. In any case, please inform your doctor about these side effects, and you could take a decision together on how you will proceed. I am assuming that you are taking Duromine for weight loss. I would suggest you to use alternative ways to that goal, for example by limiting the amount of food you take (less energy intake) and also burn unnecessary calories by engaging in higher physical activity. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Ervin Toçi