Microgestin vs. Mirena
See how Microgestin and Mirena compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Microgestin is a daily oral contraceptive pill, while Mirena is a hormonal IUD placed by a clinician and left in place for up to 8 years.
Mirena is the only hormonal IUD also FDA-approved to treat heavy menstrual bleeding, in addition to preventing pregnancy.
Microgestin carries estrogen-related clot and cardiovascular warnings that Mirena, a progestin-only device, does not share.
Microgestin vs. Mirena Drug Summary
Microgestin
Microgestin is a combination oral contraceptive containing norethindrone acetate and ethinyl estradiol, taken as a daily pill to prevent pregnancy. It comes in several dose strengths and in both 21-day and 28-day iron-supplement packs.
Mirena
Mirena is a levonorgestrel-releasing intrauterine device placed by a clinician to prevent pregnancy for up to 8 years. It is also FDA-approved to treat heavy menstrual bleeding for up to 5 years in women using it for contraception.
Microgestin vs. Mirena Side Effects
Microgestin
Mirena
Microgestin vs. Mirena Dosage
Microgestin
Mirena
| STAGE | DOSE | WHEN |
| Starting dose | 1 mg/20 mcg once daily | Days 1-21 |
| Maximum dose | 75 mg ferrous fumarate | Days 22-28 |
| Dose changes | 2 increases | Every 21 days |
| STAGE | DOSE | WHEN |
| Starting dose | ~21 mcg/day LNG release | Day 24 |
| Maximum dose | ~7 mcg/day LNG release | If needed |
| Dose changes | 2 increases | As tolerated |
Microgestin
| STAGE | DOSE | WHEN |
| Starting dose | 1 mg/20 mcg once daily | Days 1-21 |
| Maximum dose | 75 mg ferrous fumarate | Days 22-28 |
| Dose changes | 2 increases | Every 21 days |
Mirena
| STAGE | DOSE | WHEN |
| Starting dose | ~21 mcg/day LNG release | Day 24 |
| Maximum dose | ~7 mcg/day LNG release | If needed |
| Dose changes | 2 increases | As tolerated |
Microgestin vs. Mirena Indications
Microgestin
Microgestin is FDA-approved solely to prevent pregnancy in women who choose oral contraceptives. It does not protect against sexually transmitted infections, and its effectiveness depends on taking a pill at the same time every day.
Prevents pregnancy with daily use
Not effective against STIs, including HIV
Requires consistent daily dosing
Available in 21-day and 28-day (Fe) packs
Mirena
Mirena is FDA-approved to prevent pregnancy for up to 8 years and to treat heavy menstrual bleeding for up to 5 years. It does not protect against STIs and is not used for emergency contraception.
Prevents pregnancy for up to 8 years
Treats heavy menstrual bleeding up to 5 years
Placed and removed by a clinician
No daily action needed once inserted
Microgestin vs. Mirena Pros and Cons
Microgestin
Microgestin has decades of clinical use and a well-established safety profile, but it carries the class-wide risks of estrogen-containing pills and depends on the user taking it consistently. It is inexpensive and widely stocked at most pharmacies.
Pros
No procedure or clinician visit required to start
Can be stopped immediately just by not taking it
Lower monthly cost, roughly $20 to $50 without insurance
Decades of real-world use across many formulations
Cons
Requires daily adherence to stay effective
Contraindicated in smokers over 35
Carries estrogen-related clot and stroke risk
Must be taken at roughly the same time each day
Mirena
Mirena eliminates daily dosing and lasts for years once placed, but it requires an in-office insertion procedure and carries device-specific risks. Its higher upfront cost is offset by not needing ongoing purchases for years.
Pros
Lasts up to 8 years with a single placement
No daily pill to remember
Also treats heavy menstrual bleeding
Fertility typically returns quickly after removal
Cons
Requires a clinician visit for placement and removal
Higher upfront cost, roughly $900 to $1,725 per device
Risk of uterine perforation or expulsion at insertion
No generic version available
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