Good question. @addieg also asked about best time of day to take tamoxifen here: https://connect.mayoclinic.org/comment/219895/ @francine6829 suggested the morning.

They, along with @nldawn @sparklegram @mugs24cancer and @pattycincinnati, may also have some thoughts for you about controlling nausea while of tamoxifen.

My nausea did not get really bad until after I had taken Tamoxifen for a year. But it escalated so bad the next 6 months that I quit for a month and am now taking Letrozole. Tests confirmed I had developed gastritis. Stomach has taken quite awhile to heal. Still follow a GERD diet. I have no suggestions for time of day or how to get rid of the nausea. My oncologist really does not believe nausea is a side effect. But I beg to differ. Zofran helped but made me VERY constipated so that was not an answer for me. Good luck! I wish I knew what to do. The side effects that go with all this are just not pleasant!

Yes, mint tea or ginger tea is fabulous. Also there are some natural homeopathic remedies that deal with nausea that won't make you constipated etc