Although alcohol does not mix well with all medicinal drugs, many websites have suggested that alcohol does not have an adverse effect when mixed with alcohol. Norethisterone is also not an anti-biotic, so I assume that it is still effective if you drink alcohol whilst taking it. (I am not a medical proffessional, however, this answer is based purely on research from other websites.)
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If you are sufficiently foolish to take illegal drugs it should be a matter of complete indifference to you that you are taking others, prescribed or not, too.
The only advice WikiAnswers will give you about about them is not to take any, under any circumstances.