Table 1 Comparison of methods of emergency contraception

Efficacy^{a, b, c, d}

1

Most effective overall

2

Not as effective as copper IUD; most effective ECP

2

Less effective than copper IUD or UPA

Timing of use^{b, c, d, e, f}

Typically 5 days after UPI (120 h), but may be effective at any point in the cycle

5 days after UPI (120 h)

3 days after UPI (72 h), although may have efficacy up to 120 h

Available OTC^{c, g}

No

No

Yes

Timing of long-term birth control after use^{b, c}

Leave in for continued use for up to 12 years

Wait 5 days

Immediately (quick-start)

Dosage^{b, g}

N/A, insertion by medical provider

30 mg, one dose

1.5 mg, one dose

BMI^{g, h}

1

No decrease in efficacy by BMI

2

Decrease in efficacy for BMI ≥ 30

2

Decrease in efficacy for BMI ≥ 25

Breastfeeding^e

1

1

1

Hx of severe cardiovascular disease^e

1

2

2

Migraine^e

1

1

1

Severe liver disease^e

1

2

2

CYP3A4 inducers^e

1

2

2