You should not take Norethisterone if:You are pregnant or think you may be pregnant.
You have (or have had) vaginal bleeding that was undiagnosed.
You or a family member have had an issue relating to blood clots, such as DVT.
You have ever had a heart attack or angina.
You have ever had liver problems.
You suffer from porphyria.
You have pruritis which is severe and generalised all over your body.