Lo Loestrin Fe vs. Mirena

See how Lo Loestrin Fe and Mirena compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Lo Loestrin Fe is a daily pill with the lowest estrogen dose of any FDA-approved oral contraceptive, while Mirena is a hormonal IUD placed once for years of protection.

  • Lo Loestrin Fe requires daily adherence and carries cardiovascular warnings for smokers over 35, whereas Mirena needs a clinical procedure for insertion and removal.

  • Mirena is also FDA-approved to treat heavy menstrual bleeding for up to 5 years, a use Lo Loestrin Fe does not have.

Lo Loestrin Fe vs. Mirena Drug Summary

Lo Loestrin Fe

Lo Loestrin Fe is a combination oral contraceptive containing the lowest estrogen dose of any FDA-approved birth control pill, paired with a progestin and iron supplement. It's taken once daily in a 28-day cycle to prevent pregnancy.

Mirena

Mirena is a hormonal intrauterine device that releases levonorgestrel directly into the uterus. It's placed by a clinician and can prevent pregnancy for up to 8 years, or treat heavy menstrual bleeding for up to 5 years.

Lo Loestrin Fe vs. Mirena Side Effects

Lo Loestrin Fe

Most common
nausea/vomiting (up to 7%)
headache (up to 7%)
bleeding irregularities (up to 5%)
dysmenorrhea (up to 4%)

Mirena

Most common
irregular uterine bleeding (up to 31.9%)
abdominal/pelvic pain (up to 22.6%)
amenorrhea (up to 18.4%)
headache/migraine (up to 16.3%)

Lo Loestrin Fe vs. Mirena Dosage

Lo Loestrin Fe

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 1 mg/10 mcg once daily Days 1-24
Maximum dose 75mg ferrous fumarate Days 27-28
Dose changes 2 increases As tolerated

Mirena

Dosage
Dosage Table
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

Lo Loestrin Fe vs. Mirena Indications

Lo Loestrin Fe

Lo Loestrin Fe is FDA-approved to prevent pregnancy in women who choose oral contraceptives. Some clinicians also prescribe it off-label to help manage acne or other hormone-related symptoms. It does not protect against HIV or other sexually transmitted infections.

  • Prevents pregnancy with a once-daily pill

  • Off-label use for acne or hormonal symptom control

  • Does not protect against HIV or other STIs

  • Reversible; fertility returns quickly after stopping

Mirena

Mirena is FDA-approved to prevent pregnancy for up to 8 years and to treat heavy menstrual bleeding for up to 5 years in women who also want intrauterine contraception. It is not approved for use as emergency contraception after unprotected sex.

  • Prevents pregnancy for up to 8 years per device

  • FDA-approved to treat heavy menstrual bleeding

  • Not approved for emergency contraception

  • Long-acting; no daily action required

Lo Loestrin Fe vs. Mirena Pros and Cons

Lo Loestrin Fe

Lo Loestrin Fe is a low-dose combination pill taken daily, offering a familiar routine with quick reversibility. It carries FDA warnings around cardiovascular risk, particularly for smokers over 35, and requires consistent daily use for full effectiveness.

Pros

  • Taken orally with no insertion procedure needed

  • Lowest estrogen dose (10 mcg) of any approved oral contraceptive

  • Can be stopped immediately if side effects occur or pregnancy is desired

  • Also used off-label to help manage acne and hormonal symptoms

Cons

  • Requires daily adherence; missed pills reduce effectiveness

  • Boxed warning for increased cardiovascular risk in smokers over 35

  • Contraindicated with uncontrolled hypertension or vascular disease

  • Requires ongoing pharmacy refills and prescription renewal

Mirena

Mirena is a long-acting hormonal IUD placed once and left in for years, ideal for those who want a set-and-forget option. It requires a clinical procedure for placement and removal, and irregular bleeding is common in the early months after insertion.

Pros

  • Placed once and lasts up to 8 years without daily action

  • Also FDA-approved to treat heavy menstrual bleeding, not just prevent pregnancy

  • Hormone stays mostly local to the uterus, limiting systemic estrogen exposure

  • No daily pill schedule to remember

Cons

  • Requires an in-office procedure for insertion and removal

  • Irregular bleeding is common, especially in the first few months

  • Risk of uterine perforation or device expulsion

  • No generic version currently available

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