Myprimose (Ethinylestradiol, Etonogestrel)

Myprimose, a combined estrogen‑progestogen contraceptive, is indicated for preventing unintended pregnancy. It is used within the hormonal contraception pathway.

• Contraception: provides reliable prevention of pregnancy when used as directed.
• Menstrual cycle regulation: helps achieve more predictable bleeding patterns for many users.
• Treatment of hormonally‑responsive conditions: may be employed to manage symptoms such as dysmenorrhea or acne associated with hormonal imbalance.

• Ethinylestradiol and etonogestrel act together to suppress the hypothalamic‑pituitary‑ovarian axis, preventing the mid‑cycle surge of luteinizing hormone that triggers ovulation. The estrogen component stabilises the endometrial lining, while the progestogen thickens cervical mucus and further modifies the endometrium, creating an environment unsuitable for fertilisation and implantation.

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

Common Side Effects

• Nausea or mild gastrointestinal upset.
• Breast tenderness or enlargement.
• Headache or migraine episodes.
• Spotting or breakthrough bleeding.
• Mood changes or irritability.
• Weight fluctuation or fluid retention.

Serious or Rare Side Effects

• Venous thromboembolism (deep‑vein thrombosis, pulmonary embolism).
• Arterial thrombosis (stroke, myocardial infarction).
• Severe hypertension.
• Liver disorders, including benign tumors.
• Allergic reactions such as rash, angioedema, or anaphylaxis.
• Ectopic pregnancy if contraception fails.

Before initiating Myprimose, clinicians should evaluate individual risk factors and counsel patients on safe use.

• Cardiovascular assessment: review history of thromboembolic events, hypertension, or smoking.
• Hepatic function: assess liver disease, as metabolism may be impaired.
• Smoking status: advise against use in women over 35 who smoke.
• Pregnancy avoidance: confirm negative pregnancy test before starting and advise immediate discontinuation if pregnancy occurs.
• Missed dose guidance: provide clear instructions on what to do after a missed application.
• Storage: Store at room temperature: keep in the original packaging, protect from moisture and direct sunlight.

Myprimose can interact with several medicines that affect hormone metabolism or clotting risk.

Major Interactions (Avoid)

• Strong CYP3A4 inducers (e.g., rifampin, carbamazepine, phenytoin) which may reduce contraceptive efficacy.
• Certain antiretroviral agents (e.g., efavirenz) that lower hormone levels.
• St. John’s wort, a herbal inducer of hepatic enzymes.
• Antifungal agents like ketoconazole when used at high doses.

Moderate Interactions (Monitor Closely)

• Antidepressants (SSRIs) that may increase bleeding tendencies.
• Antihypertensive drugs, especially ACE inhibitors, which may affect blood pressure control.
• Diuretics, which can alter electrolyte balance.
• Anticonvulsants with moderate enzyme‑inducing properties (e.g., valproate).
• Herbal supplements such as ginseng that may have variable effects on hormone levels.