Side Effects of Implant Prevention

If you’re thinking about a contraceptive implant while raising a baby or toddler, the main thing to expect is a change in your usual bleeding pattern. Spotting and irregular bleeding are much more common than most of the other symptoms people ask about.

The implant can also be linked with headaches, weight gain, sore breasts, acne, mood changes, nausea, lower sex drive and other symptoms. How often these happen varies between studies and between people. The timing matters too: bleeding changes often stand out in the first 6–12 months, while other effects may appear at different points.

What the implant is, and why side effects come from the hormone rather than the device itself

A contraceptive implant is a small rod placed under the skin of the upper arm. It releases a hormone that helps prevent pregnancy. Nexplanon is one commonly used brand.

Most contraceptive implant side effects come from the hormone changing how your body works. The rod itself usually isn’t the reason for symptoms such as headaches, acne or changes in your period.

The hormone can affect the lining of the womb and the normal pattern of ovulation. That’s why bleeding may become lighter, more frequent, less predictable or stop altogether. Hormone changes can also be linked with symptoms such as sore breasts, mood swings, nausea and loss of libido.

The implant sits in your arm, but its effect is body-wide. That’s why the symptoms can involve parts of your body far from the insertion site.

The number one side effect: changes to your normal bleeding pattern and spotting

The most common side effect is a change in your normal menstrual bleeding pattern. This can include:

• Spotting between periods
• Light bleeding that comes and goes
• Longer or more frequent bleeding
• Periods that become less predictable
• Periods stopping completely

Spotting is especially common during the first 6–12 months. For some people it settles into a more manageable pattern. For others, irregular bleeding continues and becomes the main reason they decide the implant isn’t right for them.

This is also the side effect most likely to affect daily life. Unplanned bleeding can be frustrating when you’re caring for young children, returning to work or trying to feel comfortable in your body again after pregnancy.

For Nexplanon, around 1 in 10 women stopped using it because of changes to their bleeding pattern. That doesn’t mean 1 in 10 users have a dangerous reaction. It means the bleeding became troublesome enough that they wanted the implant removed.

Bleeding changes should be discussed during contraceptive counselling before the implant goes in. Knowing about this possibility in advance can make the first few months less worrying.

How common each side effect really is

The numbers below give a clearer picture than a flat list of possible symptoms. They come from a 2025 clinical study, so they shouldn’t be treated as an exact prediction for every implant user.

These figures mean the symptom was reported by about one in four people for weight gain, just under one in four for headache, and about one in five for loss of libido in that study.

They don’t prove that the implant caused every case. Weight, headaches and sex drive can also change because of pregnancy, broken sleep, stress, breastfeeding, illness, medication or other parts of family life. Still, the figures show why these concerns come up so often in conversations about Nexplanon side effects.

The remaining symptoms are reported too, but the information provided here doesn’t give a reliable percentage for each one. They include:

• Sore or tender breasts
• Acne
• Mood swings
• Nausea
• Ovarian cysts
• Back pain
• Stomach pain
• Thrush
• Bacterial vaginosis

A symptom being listed doesn’t mean most users will get it. It means it has been reported among people using the implant.

The side effects people don’t expect: acne, sore breasts, mood swings, nausea, ovarian cysts, back and stomach pain

Some effects are easy to connect with a contraceptive because they involve bleeding. Others can feel more random.

Acne may appear or become worse after the implant. Hormones can affect oil production in the skin, although not everyone will notice a change.

Sore breasts can feel similar to the tenderness some people have before a period. This may be uncomfortable, especially if you’re still breastfeeding or carrying a baby often.

Mood swings are another reported effect. You might notice feeling more tearful, irritable or emotionally up and down. Life with a baby or toddler can involve very little sleep and a lot of pressure, so it isn’t always clear what is causing a mood change. If your mood feels difficult to manage, or you’re worried about how you’re feeling, speak with your clinician rather than trying to work it out alone.

Nausea can also happen. If it is severe, keeps returning or stops you eating and drinking normally, ask for medical advice.

Some users report ovarian cysts. They may cause no symptoms, but pelvic pain should not simply be put down to the implant. Back pain and stomach pain have also been reported. New, strong or lasting pain needs a proper check.

These symptoms don’t all follow the same timetable. Bleeding changes are especially linked with the early months, while the available information doesn’t give a clear “usual” duration for acne, headaches, pain, mood changes or breast tenderness.

Thrush and bacterial vaginosis: the genital side effects that rarely make the list

Thrush and bacterial vaginosis are also reported by people using contraceptive implants, but they often get less attention than spotting or headaches.

Thrush can cause itching, soreness and unusual discharge. Bacterial vaginosis can change the smell or appearance of discharge. They’re different problems and need different treatment, so it’s better not to guess which one you have.

A new vaginal symptom may have another cause, too. If discharge, soreness, itching or smell doesn’t settle, ask a clinician or sexual-health service for advice. Don’t assume it is automatically one of the implant side effects.

Timeline: what the first 6–12 months look like versus the years after

The clearest time pattern is around bleeding.

During the first 6–12 months

Spotting and irregular bleeding are most likely to be noticeable during this early period. You may have light bleeding between periods, bleeding that lasts longer than expected or periods that stop.

This is the stage when it helps to keep a simple note of what is happening. You don’t need a detailed medical diary. Marking bleeding days and any other symptoms on your phone can show whether things are settling or staying difficult.

Headaches, sore breasts, nausea, acne, mood changes and changes in sex drive may also be noticed during this time. The research provided doesn’t give a fixed healing time for each symptom.

After the first year

Some people find the bleeding pattern becomes easier to live with after the early months. Others continue to have irregular bleeding for as long as the implant is in place.

The same broad side-effect list can apply later in the implant’s use. There isn’t enough information here to say that every symptom disappears after 12 months, or that a new symptom years later must be caused by the implant.

If you’re searching for 3 years implant side effects, the honest answer is that the available information doesn’t separate every effect neatly into “first year” and “third year”. Your clinician can look at the timing, your health and other possible causes.

Why about 1 in 10 women stop using the implant, and what to try before you give up on it

Around 10% of women stop using the implant because of bleeding changes. The bleeding may be light, but frequent or unpredictable spotting can still be a major nuisance.

Before deciding to have it removed, book a review if you can. Take along a note of:

• How often you bleed or spot
• Whether the bleeding is light or heavy
• Any pain, headaches or mood changes
• Changes in acne, breast tenderness or sex drive
• Any other medicines or health changes

Your prescriber can check whether the implant still suits you and whether another explanation needs attention. They can also talk through other contraceptive choices if the bleeding remains unacceptable.

You don’t have to keep using a method that makes daily life harder. At the same time, you don’t have to decide in the middle of a worrying first month without getting support.

Side effects after removal: what settles, what doesn’t, and how soon

People often ask about implant removal side effects or wonder what happens after three years and removal.

Once the implant is removed, the source of the hormone is no longer in your arm. Hormone-related symptoms may settle, but the timing is different for each person. The information available here doesn’t give a set number of days or weeks for headaches, acne, breast tenderness, mood changes, weight or libido to return to a previous pattern.

Bleeding may also take time to become familiar again. Don’t assume every symptom will disappear immediately. Weight, mood, headaches and vaginal symptoms can have more than one cause, so a problem that continues after removal deserves a separate conversation with your clinician.

Ask what to expect from the removal itself, how to care for the arm afterwards and what contraception you’ll use next if you still want to avoid pregnancy.

Long-term use and safety: what’s actually known about years of implant use

The implant is designed to provide contraception over several years, but the research provided here doesn’t give a complete list of effects split into year one, year two and year three.

That means searches such as “3 years implant side effects after removal” don’t have one simple answer. The effects people report over time still include bleeding changes, weight gain, headaches and loss of libido. One study recorded weight gain in 24.8% of users, headache in 23.8% and loss of libido in 19.8%.

The available information describes a prescribed contraceptive method with counselling before placement. It doesn’t report serious safety events in the material covered here. Most users continue with the implant, while about 1 in 10 stop mainly because of bleeding changes.

Your own safety question still needs an individual answer. Tell the prescriber about your health history, current medicines, recent pregnancy, breastfeeding and any symptoms you already have.

What to ask at your counselling appointment before the implant goes in

Take a short list with you. You could ask:

• How likely are spotting and irregular bleeding to be for me?
• What changes to bleeding are expected in the first 6–12 months?
• What should I do if bleeding becomes difficult to manage?
• Could my current headaches, acne, mood or breast tenderness change?
• How should I report severe or lasting pain?
• What should I expect while the arm heals after insertion?
• How will we check symptoms that continue after removal?
• What are my options if the implant doesn’t suit me?
• What contraception can I use if I choose removal?

Write the questions down before the appointment, especially if you’re tired, breastfeeding or juggling a toddler. A clear discussion beforehand gives you a better chance of knowing what is expected and when to ask for help.

And if your clinician has cleared you to plan a pregnancy, you can turn to the site’s guides to first shoes and early walking when your little one is ready.