Nacrez (Desogestrel)

Desogestrel acts as a progestin‑only hormonal contraceptive to prevent pregnancy.

• Prevention of pregnancy: provides reliable hormonal birth control for women of reproductive age.
• Regulation of menstrual bleeding: helps achieve more predictable menstrual cycles when used as a progestin‑only pill.
• Management of ovulation‑related disorders: suppresses ovulation in conditions where ovulation control is desired.

• Desogestrel binds to progesterone receptors in the hypothalamus and pituitary, inhibiting the luteinizing hormone surge and thereby preventing ovulation. It also induces changes in cervical mucus, making it thicker and less permeable to sperm, and alters the endometrium to reduce the likelihood of implantation.

Desogestrel may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Nausea: mild stomach upset that usually resolves with continued use.
• Headache: occasional tension‑type headaches.
• Breast tenderness: mild discomfort or swelling of the breasts.
• Irregular bleeding: spotting or changes in menstrual flow.
• Mood changes: mild fluctuations in mood or emotional state.
• Weight gain: slight increase in body weight.

Serious or Rare Side Effects

• Thromboembolic events: deep vein thrombosis or pulmonary embolism.
• Severe allergic reaction: rash, itching, swelling, or anaphylaxis.
• Liver dysfunction: jaundice or abnormal liver function tests.
• Severe hypertension: sudden increase in blood pressure.
• Vision changes: rare cases of visual disturbances.

Before prescribing Desogestrel, clinicians should consider several safety factors.

• Cardiovascular risk assessment: evaluate history of thrombosis or smoking over age 35.
• Liver function evaluation: avoid use in patients with active liver disease.
• Smoking status: counsel smokers, especially those over 35, about increased risk.
• Medication review: check for drugs that may reduce contraceptive efficacy.
• Missed dose guidance: provide instructions on what to do if a dose is missed.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Desogestrel can interact with other medicines, affecting its effectiveness or safety.

Major Interactions (Avoid)

• Rifampin: strong CYP3A4 inducer that may reduce contraceptive efficacy.
• Phenytoin: enzyme inducer that can lower desogestrel plasma levels.
• Carbamazepine: reduces hormonal contraceptive effectiveness.

Moderate Interactions (Monitor Closely)

• Ketoconazole: may increase desogestrel concentrations.
• Antifungal azoles (e.g., fluconazole): can elevate hormone levels.
• Certain antidepressants (e.g., sertraline): may modestly affect metabolism.