Birth Control Arm Implant: How It Works, Side Effects & India Cost

• The implant is a 4 cm progestogen rod placed under the skin of the upper arm; it is over 99% effective and lasts up to three years.
• It works mainly by stopping ovulation, and also thickens cervical mucus and thins the uterine lining.
• Irregular bleeding or spotting is the most common side effect, especially in the first 3-6 months; about 1 in 5 women stop having periods altogether.
• Insertion and removal are quick (5-10 minute) clinic procedures done under local anaesthetic.
• Fertility returns within weeks of removal, so pregnancy is possible almost immediately.
• In India the implant is mostly private (roughly Rs 15,000-25,000 all-in) and is not yet free in most government clinics.

The contraceptive implant (sold in India as Implanon NXT and the newer Nexplanon) is a small, flexible plastic rod about 4 cm long and 2 mm wide — roughly the size of a matchstick. It contains 68 mg of etonogestrel, a progestogen hormone, and no estrogen. A trained doctor places it just beneath the skin on the inner side of your upper arm.

Once in place, the rod slowly releases a steady, low dose of etonogestrel into your bloodstream — around 60-70 micrograms a day at first, tapering to about 25-30 micrograms a day by the third year. Because the hormone is delivered continuously and at a very low level, you avoid the daily peaks and troughs of the pill.

The implant is a type of LARC — long-acting reversible contraception — the same family that includes hormonal and copper IUDs. What sets LARC methods apart is that they are 'fit and forget': once placed, they keep working with no further action from you, which is why they have the lowest real-world failure rates of any contraception.

The implant prevents pregnancy through three overlapping mechanisms.

It stops ovulation. The steady level of etonogestrel quietens the hormonal signals from the brain that trigger an egg to be released each month. With no egg released, pregnancy cannot occur. Ovulation is suppressed in more than 99% of cycles in the first two years, falling slightly as hormone levels decline in year three.

It thickens cervical mucus. The hormone makes the mucus at the neck of the womb thick and sticky, creating a barrier that sperm struggle to swim through. This back-up effect is part of why the implant stays so reliable.

It thins the lining of the womb. The endometrium becomes thin, which also makes pregnancy less likely in the rare event an egg is released and fertilised.

Together, these give the implant a failure rate of less than 1 pregnancy per 1,000 women over a year — over 99% effective. That is more reliable than the combined pill in typical use (where about 7 in 100 women conceive over a year, mostly from missed pills) and comparable to female sterilisation, while remaining fully reversible.

A key reason for this real-world reliability is that the implant removes human error. There is no daily pill to forget, no weekly patch, no monthly ring and no quarterly clinic visit. Once it is in, it simply works in the background — which is why it suits women with demanding schedules, anyone who has struggled to remember a daily method, and those who would rather not think about contraception at all.

A note on timing: if the implant is fitted in the first five days of your period, you are protected straight away. If it is fitted at any other time, use condoms for the first seven days.

• Wear a short or loose sleeve and eat normally before the appointment.
• The site is numbed with local anaesthetic, so insertion is not painful.
• Expect mild soreness and bruising for a few days afterwards.
• Keep the dressing dry for 24 hours; you can shower normally once it is off.
• Learn to feel the rod under your skin so you can check it stays in place.

The single most common side effect of the implant — and the main reason some women have it removed early — is a change in their bleeding pattern. There is no way to predict in advance exactly how your body will respond, so it helps to know the range of what is normal.

The early months. In the first three to six months, bleeding is often unpredictable. The most common pattern is frequent or prolonged light spotting that comes and goes without a clear monthly rhythm. Others have occasional heavier breakthrough bleeding, some have no bleeding at all, and a lucky few settle into a near-normal monthly pattern quickly. About half of users notice some change in this early phase. This kind of breakthrough bleeding is similar to what can happen on other hormonal methods — our guide to spotting on birth control explains why it occurs.

Where things settle by one year. Once your body adjusts, the long-term picture is roughly: about 1 in 5 women have no periods at all, about 1 in 5 have infrequent light bleeding, around a third have unpredictable but manageable bleeding, and about a quarter continue to have prolonged or frequent bleeding. None of these patterns is harmful, and amenorrhoea (no periods) on the implant is safe — it does not mean blood is 'building up' inside you.

What can help. Patience is the first step, as most early spotting settles by six months. Tracking your bleeding in a diary or app helps you and your doctor see the pattern. If bleeding is genuinely affecting your life, a gynaecologist can prescribe short courses of treatment to settle it — for example a few months of a combined pill alongside the implant, anti-inflammatory tablets such as mefenamic acid during episodes, or tranexamic acid for heavier bleeding. These are short, supervised measures, not long-term fixes.

When to consider stopping. If bleeding stays intolerable despite support after around six months, it is entirely reasonable to switch methods — roughly 1 in 5 women have the implant removed in the first year for this reason. The decision is yours; sometimes sticking with it a little longer brings the breakthrough to a calmer pattern, and sometimes another method is simply a better fit.

Having the implant removed is usually quicker and more comfortable than having it fitted — around 5 to 10 minutes in the clinic.

When to remove it. The implant is licensed for three years, after which it should be taken out and, if you wish, replaced with a new one at the same visit. You can also have it removed any time sooner — if you want to conceive, want to switch methods, or are unhappy with side effects. There is no waiting period.

The procedure. The doctor feels for the rod, numbs the lower end with a little local anaesthetic, makes a tiny 3-4 mm cut and gently eases the rod out with fine forceps. The cut is closed with adhesive strips rather than stitches. Mild soreness and bruising for a few days are normal.

Difficult removals. In a small number of cases (around 1-2%) the rod is harder to feel or has settled a little deeper, and ultrasound or referral to a specialist may be needed to remove it. The current Nexplanon device shows up on X-ray, which makes locating it easier if there is ever any doubt; the older Implanon does not.

Fertility afterwards. This is one of the implant's biggest advantages — the hormone clears within about a week, ovulation usually returns within three weeks, and your first period typically arrives four to six weeks after removal. Pregnancy is possible in the very first cycle, so start another method straight away if you are not ready to conceive. Our guide to what happens after stopping birth control covers the transition, and conceiving after stopping contraception is worth a read if you are planning a pregnancy.

The implant has been available in India since around 2010, but unlike the copper IUD it has not yet been rolled out widely through government clinics, so most women access it privately.

What it costs. The device itself usually costs Rs 12,000-20,000, with insertion fees of roughly Rs 1,000-5,000 on top — so a total of around Rs 15,000-25,000 for three years of cover. Removal later costs about Rs 1,000-3,000. Spread over three years, that works out to roughly Rs 5,000-8,000 a year, which is competitive with the cumulative cost of daily pills and broadly comparable to the hormonal IUD.

Where to get it. Corporate hospital networks (Apollo, Fortis, Manipal, Max, Medanta and others), many private gynaecology practices in metros and increasingly Tier-2 cities, AIIMS and specialty women's hospitals, and selected FPAI (Family Planning Association of India) clinics offer insertion. Always confirm your provider has completed the short Implanon/Nexplanon training, as insertion technique matters for easy removal later.

Government access. The implant is not yet part of the standard free National Health Mission method mix in the way the copper IUD, the DMPA injection (Antara), combined pills and condoms are. Some state and CSR programmes have offered subsidised implants in specific settings, and wider integration is under discussion, but for now most women pay out of pocket or through private or corporate health insurance.

The access gap. Because of the upfront cost and the need for trained providers, the implant is currently used mainly by urban, middle and higher-income women. Expanding access for rural and lower-income women remains a stated goal of India's family-planning programme.

• Versus the combined pill: the implant is more reliable in real life and needs no daily action, but the pill gives predictable monthly bleeds and can improve acne. The pill carries a small clot risk; the estrogen-free implant does not.
• Versus the copper IUD: both are highly effective LARCs. The copper IUD is non-hormonal and lasts up to 10 years but often makes periods heavier; the implant is hormonal, lasts 3 years and may make periods lighter or absent (though bleeding can be unpredictable).
• Versus the hormonal IUD (Mirena, Eloira): similarly effective, but the hormonal IUD lasts 5+ years, tends to give lighter or no periods and treats heavy periods — see our copper vs Mirena comparison. The implant avoids any device in the uterus.
• Versus the DMPA injection: both are estrogen-free, but the implant is more effective, lasts three years per fit rather than needing a jab every 13 weeks, and reverses far faster (the injection can delay fertility for several months).
• Versus sterilisation: the implant is fully reversible, whereas tubal ligation or vasectomy is permanent — a better fit if you may want children in future but are not certain yet.

• Want highly reliable contraception with nothing to remember day to day.
• Struggle to take a daily pill consistently.
• Cannot use estrogen — for example a history of blood clots, migraine with aura, or high blood pressure.
• Are breastfeeding (the implant is safe and does not reduce milk supply).
• Want a private method that needs no partner involvement.

Once the early adjustment settles, life with the implant is largely indistinguishable from life without it — minus the worry about pregnancy.

Everyday activities and sex. The implant does not affect exercise, swimming, weightlifting, sleeping on that arm or what you wear, and neither you nor your partner feels it during sex. Contraceptive cover is continuous.

Medical care and scans. Dental work, surgery and imaging (X-ray, ultrasound, CT and MRI) are all safe with the implant in place. Mention it only if you are having surgery on that arm.

Medicines. Most everyday medicines, including ordinary antibiotics, do not affect the implant. The exceptions are enzyme-inducing drugs (rifampicin, certain anti-epileptics, some HIV medicines and St John's Wort), which reduce its effectiveness — our guide to antibiotics and birth control explains which medicines matter and which do not.

Travel and climate. With no pill to pack, no time zones to manage and no temperature concerns, the implant is genuinely travel-friendly and works the same in any climate.

Self-checks and follow-up. You can gently feel for the rod from time to time for reassurance — it should sit as a small firm line where it was placed. Mark your insertion date so you remember to replace or remove it at three years; effectiveness falls if you leave it in beyond its licence.

• Heavy or prolonged bleeding that is affecting your daily life, or any bleeding that continues to trouble you beyond six months.
• Pain, redness, swelling, warmth or discharge at the insertion site, or a wound that is not healing — this could signal infection.
• You can no longer feel the rod, can feel only part of it, or it feels different or has clearly moved.
• A severe or persistent new headache, migraine with aura, or sudden visual changes.
• Significant low mood, anxiety or other mental-health changes since the implant was fitted.
• Symptoms of pregnancy (a missed-feeling combined with nausea or breast changes), since although rare, pregnancy on the implant needs prompt assessment to rule out an ectopic pregnancy.

• WHO — Family planning / contraception methods (implants)
• WHO — Medical Eligibility Criteria for Contraceptive Use
• ACOG — Long-Acting Reversible Contraception (LARC): Implants and IUDs
• NHS — Contraceptive implant
• FSRH (UK Faculty of Sexual & Reproductive Healthcare) — Progestogen-only Implants Guideline
• Ministry of Health & Family Welfare, India — Family Planning