Match contraceptive mechanisms, bleeding effects, medical eligibility, and daily demands to patient goals, then handle missed pills and emergency contraception.
The most effective method on a chart may not be the method a patient wants. Start with pregnancy goals, bleeding preferences, daily routines, and medical conditions. Offer reliable options without treating a preference for pills, condoms, or no device as a problem to overcome.
Where the method acts explains what the patient notices
Combined hormonal contraception, or CHC, includes the combined pill, patch, and vaginal ring. Estrogen and progestin suppress the hypothalamic-pituitary-ovarian axis, reducing gonadotropin stimulation and preventing ovulation. Progestin also thickens cervical mucus. The route does not erase estrogen exposure. A vaginal ring and a transdermal patch retain the major estrogen-related vascular contraindications. Combined methods can reduce menstrual bleeding and dysmenorrhea and are associated with lower ovarian and endometrial cancer risk. [1][2]
Compare the main sites of contraceptive action
Ovary and hormonal signaling
Combined methods, the etonogestrel implant, and DMPA strongly suppress ovulation. Drospirenone pills also primarily inhibit ovulation.
Cervical passage
Progestins make cervical mucus harder for sperm to penetrate. This is central to norethindrone and norgestrel pills and the levonorgestrel IUD.
Uterine environment and sperm
Copper impairs sperm function and fertilization. The levonorgestrel IUD also suppresses the endometrium, reducing bleeding.
Physical barrier
Condoms limit sperm exposure and reduce transmission of many sexually transmitted infections. Diaphragms provide pregnancy protection but not comparable STI protection.
These mechanisms overlap. Endometrial thinning explains bleeding changes; it should not be taught as proof that routine contraception works by ending an implanted pregnancy.
Typical use asks how a method performs in daily life, including missed doses and delayed replacement. IUDs and implants have annual pregnancy rates below one per hundred users because little ongoing action is needed after placement. Pills, patches, rings, and injections depend more on continued use as scheduled. Condoms, withdrawal, and fertility-awareness methods depend on actions around intercourse or cycle tracking. Fertility-awareness methods vary in effectiveness and require instruction. Do not turn broad tiers into identical failure rates for all methods within a tier. [3][4]
An implant or IUD is a useful offer when daily dosing is difficult and reversibility matters. Permanent contraception is appropriate only when the patient wants permanence after informed discussion. If a patient declines sterilization or an intrauterine device, an arm implant may match the request. No clinician should pressure a patient into a more durable method simply because it is more effective. Condoms can be combined with any chosen method for STI protection.
Choose the duration and bleeding pattern deliberately
Nexplanon contains etonogestrel and is placed subdermally in the upper arm. The FDA label updated in January 2026 permits contraceptive use for up to five years, replacing the original three-year statement. Unpredictable spotting or amenorrhea is common. Irregular bleeding does not by itself mean the implant has stopped working, but new concerning symptoms warrant pregnancy, infection, and other evaluation as indicated. [4]
Levonorgestrel IUDs release progestin locally and often make periods lighter over time, although irregular bleeding can occur initially. Device and indication determine duration. For example, Mirena is approved for contraception for eight years and treatment of heavy menstrual bleeding for five years. Do not extend the heavy-bleeding indication to eight years merely because the contraceptive indication lasts that long. Evaluate unexplained heavy bleeding before attributing it to a benign cycle pattern. [5]
Paragard is a hormone-free copper IUD approved for contraception for ten years. It can increase menstrual bleeding and cramping, which may make it a poor fit for a patient already troubled by these symptoms. Wilson disease and copper hypersensitivity are label contraindications. These are product-specific facts, not a rule that all IUDs contain copper or have the same lifespan. An IUD sits in the uterine cavity, with retrieval strings extending through the cervix; an arm implant is a different device in a different location. [6]
Depot medroxyprogesterone acetate, or DMPA, is usually given every 13 weeks. It suppresses ovulation and may cause irregular bleeding followed by amenorrhea, weight gain, and delayed return of ovulation after stopping. The delay does not equal permanent infertility. It also reduces bone mineral density. Recovery commonly occurs after stopping, but speed and completeness vary and long-term fracture implications remain uncertain. ACOG does not consider bone concerns alone a reason to prohibit DMPA in every adolescent or automatically stop at two years. Discuss the FDA boxed warning and individual alternatives. [7][8]
Progestin-only pills are not one interchangeable formulation. Norethindrone and norgestrel depend heavily on cervical mucus and are sensitive to dosing delays. Drospirenone has a different missed-pill pathway and more consistent ovulation suppression. Known hyperkalemia is a contraindication to drospirenone-only pills in the CDC renal-disease guidance; review renal disease and potassium-raising medicines rather than assuming every estrogen-free pill has identical safety. [1][9]
Separate estrogen restrictions from restrictions on all hormones
The CDC U.S. Medical Eligibility Criteria, or MEC, assigns four categories. Category 1 has no restriction. Category 2 means benefits generally outweigh risk. Category 3 means risks usually outweigh benefits. Category 4 means unacceptable health risk. Categories apply to a specific method and condition; they are not a score added across diagnoses. Use the detailed table when conditions coexist. [1]
FindingAge at least 35, fewer than 15 cigarettes daily
Combined hormonal contraceptionCategory 3
Clinical consequenceUsually choose another method.
FindingAge at least 35, at least 15 cigarettes daily
Combined hormonal contraceptionCategory 4
Clinical consequenceDo not use CHC.
FindingBP at least 160 systolic or 100 diastolic
Combined hormonal contraceptionCategory 4
Clinical consequenceAssess hypertension and offer another method.
FindingCurrent breast cancer
Combined hormonal contraceptionCategory 4
Clinical consequenceProgestin methods are also category 4; copper IUD is category 1.
Migraine without aura is different from aura, and age over 35 without smoking is different from the age-smoking combination. A normal blood pressure does not cancel the vascular risk of smoking. Prior stroke, ischemic heart disease, decompensated cirrhosis, and certain liver tumors also impose major restrictions on CHC. “Active liver disease” is too vague; compensated cirrhosis with normal liver function does not carry the same category as decompensated disease.
For prior DVT or pulmonary embolism, recurrence risk and anticoagulation status matter. A history of estrogen-associated, pregnancy-associated, idiopathic, or recurrent VTE generally places CHC in category 4 when not receiving anticoagulation. Lower recurrence risk may be category 3. DMPA is category 3 in higher recurrence-risk settings, while an implant, suitable progestin-only pill, or LNG-IUD may be category 2. Do not label all progestin methods completely free of thrombosis considerations. [1]
Obesity does not make all systemic contraception ineffective through presumed dilution into fat. IUDs and implants remain highly effective options. Some patches have product-specific weight or BMI efficacy and safety restrictions. Obesity also contributes to vascular risk, particularly with other risk factors. Check the exact product and MEC context rather than doubling oral contraceptive doses or excluding all hormonal choices.
Make the chosen method usable from the first day
Assess whether pregnancy can reasonably be excluded, recent unprotected intercourse, and need for emergency contraception. A negative urine test immediately after intercourse does not exclude conception from that exposure. IUD placement requires reasonable certainty the patient is not pregnant. Same-day gonorrhea and chlamydia screening may accompany placement when indicated and there are no signs of active infection. Current purulent cervicitis, gonorrhea, or chlamydia means defer placement and treat. An overdue Pap alone is not a reason to withhold contraception. [10]
Measure blood pressure before CHC. A pelvic examination is not required solely to start pills, a patch, or a ring. Explain how soon protection starts and how long backup is needed based on method and cycle timing. If two or more consecutive active combined pills are missed, meaning at least 48 hours since a pill should have been taken, take the most recent missed pill, continue the pack, and use condoms or abstain until seven consecutive active pills have been taken. Misses late in the active-pill sequence may require skipping the hormone-free interval; first-week misses with recent intercourse may require emergency contraception. [2]
For norethindrone or norgestrel, a pill more than three hours late is missed. Take it as soon as possible, continue daily dosing, and use backup for two days. For drospirenone, one late or missed active pill with less than 48 hours elapsed does not require backup; two or more missed active pills require seven days of backup. Review emergency contraception when exposure occurred during a vulnerable interval. Product-specific instructions prevent a timing rule from being applied to the wrong pill. [9]
Ask whether the bleeding pattern and daily routine still fit at follow-up. Explain expected spotting, offer evaluation and treatment when appropriate, and honor a request to stop or remove a method. A contraceptive choice can change. Continuing an unwanted method is not a measure of successful counseling.
Two time-sensitive situations require different clocks
CHC is category 4 before 21 days postpartum because thrombosis risk is high. From 21 through 42 days, breastfeeding and additional VTE risk factors determine the category. After 42 days, breastfeeding alone is category 2 for CHC, not an absolute prohibition; nonbreastfeeding patients without other restrictions are category 1. Progestin-only methods are often useful during lactation. Postpartum IUD placement is an option, with timing-specific expulsion counseling and exclusion of postpartum sepsis. [1][10]
Lactational amenorrhea works only when all three conditions are met. The patient is under six months postpartum, remains amenorrheic, and is fully or nearly fully breastfeeding, with feeding gaps generally no longer than four hours by day or six by night. Nursing-related endocrine suppression can reduce ovulation, but eight feeds per day alone does not establish reliable contraceptive protection. Ovulation can precede the first period. [1]
Emergency contraception addresses intercourse that already occurred. The copper IUD is a highly effective option within five days of the first unprotected intercourse and provides ongoing contraception. When ovulation can be estimated, placement may be later than five days after intercourse provided it is no more than five days after ovulation. Confirm eligibility and do not place it in an established pregnancy. Its main contraceptive action is impairment of sperm and fertilization; do not claim a proven post-implantation treatment effect. [6][11]
Oral ulipristal acetate 30 mg and levonorgestrel 1.5 mg should be taken as soon as possible within five days. Ulipristal is more effective at days three through five. Levonorgestrel may be less effective with obesity, but weight is not a reason to withhold available emergency contraception. Oral agents primarily delay ovulation and do not terminate an established pregnancy. Mifepristone plus misoprostol is a medication-abortion regimen, not the U.S. ulipristal emergency regimen. [11]
After ulipristal
Usually wait five days before starting or resuming hormonal contraception, then use condoms or abstain for seven days after starting, or until the next menses if sooner.
After levonorgestrel
Start or resume the regular method immediately and use backup for seven days.
Starting a progestin too soon after ulipristal can reduce its ovulation-delaying effect. A same-day provider-dependent method may sometimes be considered after balancing interaction risk against inability to return. Test for pregnancy if there is no withdrawal bleed within three weeks. Emergency pills do not protect later intercourse. A randomized trial supports the 52-mg LNG-IUD for emergency contraception, but this is distinct from the copper-IUD option listed in CDC SPR 2024 and should follow the applicable clinical protocol; do not extrapolate to lower-dose LNG devices. [11][12]
Match the plan to the patient
Case 1
Show answer and explanations for case 1
A. Etonogestrel implant (Best answer)
The implant supplies high effectiveness without estrogen and matches her device preference.
B. Combined oral pill (Why this does not fit)
Migraine with aura makes CHC category 4 despite normal BP and no smoking.
C. Combined vaginal ring (Why this does not fit)
The ring still contains estrogen and has the same aura restriction.
D. Condoms alone as the only safe option (Why this does not fit)
Condoms are useful for STI protection, but appropriate progestin contraception is not excluded.
Takeaway: Aura restricts estrogen, not every contraceptive option.
A. Laparoscopic tubal sterilization (Why this does not fit)
This provides permanent contraception, which she has declined; the request specifically calls for a reversible method outside the uterus.
B. A daily combined oral contraceptive (Why this does not fit)
This can provide effective reversible contraception but requires daily use, whereas she specifically requests years of protection with little daily effort.
C. Etonogestrel implant (Best answer)
It provides long-term reversible contraception outside the uterus.
D. A diaphragm used with each episode of intercourse (Why this does not fit)
A diaphragm is reversible but requires action with intercourse and has lower typical-use effectiveness than an implant.
Takeaway: Respect the patient’s boundaries while offering methods that meet the remaining goals.
