Implanon Nxt (Etonogestrel)

Etonogestrel, a progestin hormonal contraceptive, is used to prevent pregnancy.

• Contraception: Provides effective prevention of pregnancy for up to three years after insertion of the subdermal implant.
• Family planning: Enables long‑acting reversible contraception for women who prefer a non‑daily method.
• Hormonal birth control: Delivers a steady release of progestin to inhibit ovulation without the need for daily dosing.

• Etonogestrel released from the subdermal rod binds to progesterone receptors in the hypothalamus and pituitary, suppressing the luteinizing hormone surge and thereby inhibiting ovulation. It also thickens cervical mucus, reducing sperm penetration, and induces endometrial changes that are unfavorable for implantation, resulting in effective contraception.

Common Side Effects

• Irregular bleeding or spotting: Changes in menstrual pattern are frequent during the first months.
• Headache: Mild to moderate headaches may occur.
• Weight gain: Some users report modest increases in body weight.
• Breast tenderness: Mild discomfort or swelling of the breasts.

Serious or Rare Side Effects

• Ectopic pregnancy: Though rare, pregnancy may occur outside the uterus.
• Implant migration: The rod may shift from its original insertion site.
• Severe allergic reaction: Signs include rash, swelling, or difficulty breathing.
• Infection at insertion site: Redness, warmth, or pus may develop.
• Thrombosis: Rare clotting events have been reported.

Before insertion, clinicians should evaluate patient history and ensure appropriate use.

• Screen for contraindications: Confirm the patient is not pregnant and has no history of thromboembolic disorders.
• Assess medical history: Review liver disease, hormone‑sensitive cancers, and severe migraines.
• Monitor bleeding patterns: Counsel about possible changes in menstrual bleeding.
• Avoid insertion in infection: Ensure the insertion site is clean and free of active infection.
• Store at ambient temperature: Keep in the original packaging, protect from moisture and direct sunlight.

Etonogestrel may interact with other medicines that affect hormone metabolism or efficacy.

Major Interactions (Avoid)

• Combined hormonal contraceptives: Do not use simultaneously as it may cause hormonal excess.
• Enzyme inducers (e.g., rifampicin, carbamazepine): May reduce etonogestrel levels and effectiveness.
• Antifungal azoles (e.g., ketoconazole): May increase etonogestrel concentrations, raising risk of side effects.

Moderate Interactions (Monitor Closely)

• Certain antibiotics (e.g., tetracycline): May slightly lower contraceptive efficacy; monitor for breakthrough bleeding.
• Herbal supplements (e.g., St. John’s wort): May decrease effectiveness; advise close observation.