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Tamoxifen is taken by mouth in tablet form.
The drug is also manufactured under different brand names and these may appear on the tablets. Research has shown that a dose of 20mg per day is adequate and reduces the chance of side effects. Sometimes a higher dose is given for a few days at the start of treatment to try and achieve a quicker effect. This is known as a loading dose. Tamoxifen is usually prescribed as a single daily dose and this should be taken at the same time each day - the actual time does not matter.