Norethisterone is a medication which can be used to delay your period. To read more information about the use and side effects of this medication please click here.

Reasons for inclusion

  • You are female and over 16 years of age.

Reasons for exclusion

  • You have a known hypersensitivity to norethisterone or to any of the excipients
  • You are pregnant or suspect that you are.
  • You have a presence or history of severe hepatic disease as long as liver function values have not returned to normal
  • You have undiagnosed genital bleeding
  • You have any previous idiopathic or current thromboembolism (deep vein thrombosis, pulmonary embolism).
  • You have an active or recent arterial thromboembolic disease (e.g. angina, myocardial infarction).
  • You have porphyria
  • You have epilepsy.
  • You have asthma.
  • You have cardiac dysfunction.
  • You have renal dysfunction
  • You have diabetes mellitus with vascular involvement
  • You have rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption
  • You are taking other sex hormones, including contraception
  • You are taking inducers of drug-metabolising enzymes, especially cytochrome P450 enzymes, including: anticonvulsants (e.g. phenobarbital, phenytoin, carbamazepine) and anti-infectives (e.g. rifampicin, rifabutin, nevirapine, efavirenz, tetracyclines, ampicillin, oxacillin and co-trimoxazole)
  • You are taking ritonavir and nelfinavir
  • You are taking herbal preparations containing St John s Wort (Hypericum Perforatum)
  • You are taking Aminoglutethimide
  • You are taking Ciclosporin
  • You are lactating
  • You have a presence or a history of prodromi of a thrombosis (e.g. transient ischaemic attack, angina pectoris)
  • You have a high risk of venous or arterial thrombosis
  • You have previous or existing liver tumours (benign or malignant)
  • You have known, past or suspected sex hormone-dependent malignancies, including breast or genital tract carcinoma
  • You have a history of migraines with focal neurological symptoms
  • History during pregnancy of idiopathic jaundice, severe pruritus, or pemphigoid gestationis
  • You have untreated endometrial hyperplasia
  • You have an active trophoblastic disease (until return to normal of urine- and plasma gonadotrophin concentration) – seek specialist advice. Patients should not use norethisterone after a recent evacuation of a hydatiform mole
  • You are taking nbsp;Anticoagulants
  • You are taking Griseofulvin
  • You are taking Amprenavir, taking Selegiline, taking Tizanidine