Mini-Pe (Norethisterone)

• Norethisterone is a synthetic progestogen used in the management of hormonal and menstrual conditions.
• Menstrual disorders: regulates irregular cycles and reduces heavy bleeding.
• Contraception: prevents ovulation to provide reliable hormonal birth control.
• Endometriosis: alleviates pain and suppresses ectopic endometrial tissue growth.
• Secondary amenorrhea: induces withdrawal bleeding in women with absent menstrual periods.
• Premenstrual syndrome: lessens symptoms such as mood swings and bloating.
• Hormone replacement therapy adjunct: stabilizes estrogen fluctuations during menopausal transition.

• Norethisterone mimics natural progesterone by binding to intracellular progesterone receptors in the hypothalamus, pituitary gland and reproductive tissues. This binding blocks the luteinising hormone surge that triggers ovulation, thereby preventing egg release. In the endometrium, it promotes a secretory state and suppresses proliferation, creating conditions that are unfavorable for implantation. The combined hormonal actions provide both contraceptive efficacy and therapeutic benefit in menstrual‑related disorders.

Oral norethisterone may cause a range of adverse reactions, which are categorized by frequency and severity.

Common Side Effects

• Nausea: mild stomach upset often occurring early in treatment.
• Headache: transient tension‑type headaches.
• Breast tenderness: mild discomfort or swelling of breast tissue.
• Spotting: irregular light bleeding between periods.

Serious or Rare Side Effects

• Thromboembolic events: deep vein thrombosis or pulmonary embolism.
• Hepatic dysfunction: jaundice or abnormal liver enzymes.
• Severe allergic reaction: rash, swelling, or anaphylaxis.

• Before prescribing norethisterone, clinicians should consider several precautionary measures to ensure patient safety.
• Assess cardiovascular risk: evaluate history of thrombosis, smoking, or hypertension.
• Review liver function: avoid use in patients with active hepatic disease.
• Monitor blood pressure: check for hypertension during therapy.
• Counsel on smoking: advise cessation, especially in women over 35.
• Evaluate for hormone‑sensitive cancers: avoid in known breast or endometrial carcinoma.
• Store at ambient temperature: keep tablets in original container, protect from moisture and heat.

Norethisterone can interact with other medicines, altering its effectiveness or increasing adverse effect risk.

Major Interactions (Avoid)

• Anticoagulants: may enhance anticoagulant effect, increasing bleeding risk.
• Antiepileptic enzyme inducers (e.g., carbamazepine, phenytoin): reduce plasma levels, decreasing efficacy.
• HIV protease inhibitors: may increase norethisterone concentrations, raising side‑effect potential.

Moderate Interactions (Monitor Closely)

• Antibiotics (rifampicin, griseofulvin): may lower hormone levels, reducing contraceptive reliability.
• Antifungal azoles (ketoconazole, itraconazole): can increase hormone levels, potentially intensifying side effects.
• St. John’s wort: may decrease effectiveness through enzyme induction.