A 32-year-old woman with irregular, heavy menstrual bleeding (menorrhagia) and dysmenorrhea seeks contraception and symptomatic relief. She has no contraindications to estrogen. Which oral contraceptive formulation is the drug of choice for this clinical scenario?

Explanation

## Management of Menorrhagia and Dysmenorrhea with Oral Contraceptives **Key Point:** Low-dose combined oral contraceptives (COCs) with ethinyl estradiol and levonorgestrel, taken in a continuous or extended-cycle regimen, are the first-line hormonal choice for menorrhagia and dysmenorrhea. ### Why Low-Dose COCs Work in Menorrhagia 1. **Suppression of endometrial proliferation:** Estrogen and progestin together inhibit endometrial growth, reducing menstrual flow by 40–50%. 2. **Stabilization of endometrial microvasculature:** Prevents excessive bleeding from fragile vessels. 3. **Reduction of prostaglandin synthesis:** Particularly with levonorgestrel-containing formulations, which reduces dysmenorrhea. 4. **Amenorrhea option:** Extended-cycle or continuous regimens reduce or eliminate menstruation, providing additional symptom relief. ### Comparison of Options | Formulation | Mechanism | Efficacy in Menorrhagia | Dysmenorrhea Relief | First-Line? | | --- | --- | --- | --- | --- | | **Low-dose COC (EE + LNG)** | Endometrial suppression + PG inhibition | Excellent (40–50% reduction) | Excellent | ✓ Yes | | **High-dose COC** | Same, but higher hormone dose | Good, but unnecessary | Good | ✗ Avoid (increased side effects) | | **Progestin-only pill** | Endometrial atrophy only | Moderate (20–30% reduction) | Minimal | ✗ Less effective | | **Progestin-only injectable** | Endometrial atrophy + amenorrhea | Excellent | Excellent | ✓ Alternative | **High-Yield:** The **levonorgestrel** component is particularly effective for dysmenorrhea because it has potent progestagenic and androgenic activity, enhancing prostaglandin inhibition. **Clinical Pearl:** Extended-cycle (84 days of active pills + 7 placebo) or continuous regimens reduce menstrual frequency and are preferred over standard 21/7 cycles for symptomatic relief. ### Recommended Regimen - **Standard:** Low-dose COC (20–30 µg ethinyl estradiol + levonorgestrel) in a 21/7 cycle - **Enhanced relief:** Extended-cycle (84/7) or continuous regimen - **Example:** Norgestimate-containing formulations are also effective but levonorgestrel is the classic choice for dysmenorrhea **Mnemonic:** **LEV-FLOW** — **LEV**onorgestrel reduces **FLOW** (menstrual bleeding) and dysmenorrhea.