Kliogest (Norethisterone Acetate, Estradiol)

Kliogest, a combined estrogen‑progestogen oral contraceptive, acts on the hypothalamic‑pituitary‑ovarian axis to control reproductive function.

• Prevention of pregnancy: provides reliable contraceptive protection by suppressing ovulation and altering cervical mucus.
• Regulation of menstrual cycles: helps achieve predictable bleeding patterns and reduces menstrual discomfort.
• Management of estrogen‑deficiency symptoms: alleviates hypo‑estrogenic signs in women using combined oral contraceptives.

• Kliogest delivers norethisterone acetate, a progestogenic agent, and estradiol, an estrogenic agent, which together suppress the hypothalamic‑pituitary‑ovarian axis. This inhibition prevents the mid‑cycle luteinizing hormone surge, thereby blocking ovulation. In addition, the progestogen thickens cervical mucus and the estrogen component stabilises the endometrial lining, reducing the likelihood of fertilisation and implantation.

Kliogest may cause a range of adverse reactions. Most are mild and transient, but serious events can occur.

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Breast tenderness: discomfort or swelling of the breasts.
• Headache: occasional tension‑type headaches.
• Spotting or breakthrough bleeding: irregular light bleeding.
• Mood changes: irritability or mild depressive symptoms.
• Weight gain: modest increase in body weight.

Serious or Rare Side Effects

• Venous thromboembolism: deep‑vein thrombosis or pulmonary embolism.
• Arterial thrombosis: stroke or myocardial infarction.
• Severe hypertension: sudden increase in blood pressure.
• Liver dysfunction: jaundice or abnormal liver enzymes.
• Allergic reaction: rash, itching, or swelling of the face.
• Visual disturbances: sudden vision changes or loss.

Before prescribing Kliogest, clinicians should evaluate individual risk factors and contraindications.

• Contraindications: known thrombophilia, active liver disease, hormone‑dependent tumors, pregnancy, or breastfeeding.
• Smoking: avoid use in women over 35 who smoke due to increased cardiovascular risk.
• Cardiovascular history: assess prior hypertension, stroke, or myocardial infarction.
• Drug interactions: review concomitant medications that induce hepatic enzymes or affect coagulation.
• Store at ambient temperature below 25°C: keep in the original blister, protect from moisture and light.

Kliogest can interact with several medicines, altering its effectiveness or safety profile.

Major Interactions (Avoid)

• Strong CYP3A4 inducers (e.g., rifampicin, carbamazepine): may markedly reduce contraceptive efficacy.
• Anticoagulants (e.g., warfarin): may increase bleeding risk.

Moderate Interactions (Monitor Closely)

• Antiepileptics (e.g., phenytoin): may lower hormone levels, reducing protection.
• Antiretrovirals (e.g., efavirenz): may diminish contraceptive effectiveness.
• Herbal supplements (e.g., St. John's wort): may decrease plasma hormone concentrations.