Levosert Shi (Levonorgestrel)

Levosert Shi, a levonorgestrel intrauterine system, is used within the hormonal contraceptive pathway for preventing unintended pregnancy.

• Long‑acting reversible contraception: provides up to five years of pregnancy prevention without daily dosing.
• Prevention of unintended pregnancy: offers a highly effective method for women of reproductive age.
• Intrauterine contraception preference: suitable for women who choose a non‑oral, device‑based birth control option.

• Levosert Shi releases levonorgestrel locally within the uterine cavity, where the progestin binds to progesterone receptors in the endometrium, cervical mucus, and hypothalamic‑pituitary axis. This suppresses ovulation, thickens cervical mucus to impede sperm passage, and induces endometrial changes that reduce the likelihood of implantation, resulting in effective contraception.

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

Common Side Effects

• Irregular vaginal bleeding or spotting.
• Amenorrhea (absence of periods).
• Pelvic or abdominal discomfort.
• Cramping during or after insertion.
• Breast tenderness.
• Headache.

Serious or Rare Side Effects

• Uterine perforation during insertion.
• Expulsion of the intrauterine system.
• Pelvic inflammatory disease or infection.
• Ectopic pregnancy if contraception fails.
• Allergic reaction to device materials.
• Severe abdominal pain requiring medical evaluation.

Before using Levosert Shi, certain precautions should be observed to ensure safety and effectiveness.

• Screen for contraindications: ensure the patient has no active pelvic infection, unexplained vaginal bleeding, or uterine anomalies.
• Confirm non‑pregnancy: verify the patient is not pregnant prior to insertion.
• Timing of insertion: place the device within the first seven days of the menstrual cycle for optimal efficacy.
• Follow‑up assessment: schedule a check‑up six weeks after insertion to confirm correct positioning.
• Plan for removal: arrange device removal after the approved duration or earlier if complications arise.
• Store at ambient temperature: keep in the original packaging, protect from moisture and direct sunlight.

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

Major Interactions (Avoid)

• Enzyme‑inducing anticonvulsants (e.g., carbamazepine, phenytoin): may reduce levonorgestrel levels.
• Rifampin or other strong enzyme inducers: can lower hormonal effectiveness.
• Certain antiretroviral protease inhibitors: may alter hormone metabolism.

Moderate Interactions (Monitor Closely)

• Broad‑spectrum antibiotics (e.g., tetracycline): may slightly diminish contraceptive efficacy.
• Herbal supplements such as St. John’s wort: could reduce hormone levels and increase risk of breakthrough bleeding.