IUD vs Implant for Birth Control: 9 Key Differences Explained

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As you are searching for a suitable contraceptive method that fits your lifestyle and preferences, it can be overwhelming. However, two birth control methods have been gaining popularity among women in recent years – the IUD and hormonal implant.

Intrauterine Devices (IUDs) and hormonal implants are both forms of long-acting reversible contraceptives (LARCs) designed to provide extended protection against pregnancy. The IUD is a small, T-shaped device inserted into the uterus, while birth control implants are tiny rods placed under the skin of the upper arm. 

If you’re new to IUDs, you can read this beginner’s guide about IUDs to learn how they work, what types are available, and what to expect during the process.

While both are highly effective forms of birth control, they differ in various aspects that may impact your decision-making process. Let’s explore IUD vs Implant in this post to help you decide on your birth control needs.

Key Similarities

Effectiveness

Both IUDs and hormonal implants are highly effective methods for preventing pregnancy, with a success rate of more than 99%. This means that fewer than 1 out of 100 individuals using either method for a year will experience an unintended pregnancy. Their effectiveness makes them reliable choices for those seeking long-term contraceptive solutions.

Reversibility

A notable benefit of both IUDs and implants is their reversibility. When you decide to conceive, fertility typically returns soon after the removal of either contraceptive device. This makes them suitable for those who may want to consider pregnancy in the future without long-lasting effects on fertility.

Low-maintenance

One of the main advantages of opting for an IUD or implant is their low-maintenance nature. Once inserted by a healthcare professional, both methods require little to no daily attention. They offer long-lasting protection – up to 5 years for IUDs and up to 3 years for the Nexplanon implant. This convenience may suit individuals with busy lifestyles who prefer not to worry about daily birth control pills.

9 Key Differences Between IUDs and Implants

1. Placement and Procedure

Alt text: How IUDs work

IUDs
IUDs, or intrauterine devices, are small, T-shaped devices inserted directly into the uterus. The procedure for inserting an IUD can cause brief but intense discomfort and cramping for some individuals.

A healthcare provider typically performs the insertion during a regular office visit, and it involves using a speculum to access the cervix. You may take some oral painkillers to reduce pain, though some discomfort is often unavoidable.

For a detailed overview of the IUD insertion process, visit this guide to IUDs in Singapore at Ezra Clinic.

Implants


Implants are small, flexible rods inserted just under the skin of the upper arm. The insertion process of a birth control implant is usually quick and causes minimal discomfort.

A local anaesthetic is used to numb the insertion site. The procedure involves a small incision through which the implant is placed.

2. Hormonal vs Non-Hormonal Options

When considering a birth control method, it’s important to understand the distinction between hormonal and non-hormonal options. Hormonal birth control works by releasing hormones to prevent pregnancy, while non-hormonal methods use physical barriers or other mechanisms to achieve the same outcome.

IUDs
These come in both hormonal and non-hormonal (copper) forms. Hormonal IUDs release progestin, which thickens cervical mucus and may suppress ovulation. It also thins the uterine lining, creating an environment less supportive of a fertilised egg.

On the other hand, copper IUDs create an environment that is toxic to sperm, preventing fertilisation without the use of hormones. A copper IUD works by physically inhibiting fertilisation and implantation in the womb.

Implants
The birth control implant prevents pregnancy by releasing a steady amount of the hormone progestin into the bloodstream, which prevents ovulation, thickens cervical mucus, and thins the uterus lining, making it harder for a fertilised egg to implant.

3. Impact on Periods

Hormonal IUDs can often lighten periods, shorten their duration, or even stop them completely. This makes them an attractive option for individuals looking to manage heavy menstrual bleeding or for those who prefer minimal menstrual disruption. The Copper IUD may cause heavier periods or more cramps, but your cycles will remain the same.

Implants Implants, on the other hand, can cause irregular bleeding patterns. Users may experience spotting, lighter periods, or, in some cases, no periods at all. The variability in menstrual impact makes implants suitable for those who are flexible with their menstrual cycle changes.

4. Duration

The longevity of each method varies significantly:

  • Copper IUDs can be used effectively for up to 5 years.
  • Hormonal IUDs can be used effectively for up to 5 years.
  • Implants can be effectively used as birth control for up to 3 years.

5. Effectiveness Timeline

  • Both IUDs and implants boast effectiveness rates of over 99%, making them highly reliable forms of contraception. The timeline for when each method becomes effective, however, differs slightly.
  • Copper IUDs are effective immediately upon insertion, providing instant protection. In contrast, hormonal IUDs and implants require a short timeframe to become effective. Hormonal IUDs and Contraceptive implants typically become effective within a week.

6. Side Effects

Both IUDs and implants are generally safe and well-tolerated, but some users might experience side effects.

IUDs: With copper IUDs, users may experience heavier periods initially. However, those opting for hormonal IUDs might notice lighter periods or even an absence of menstruation over time.

Implants: Users of the contraceptive implant might encounter irregular bleeding patterns, particularly in the first months following insertion. Some patients may also experience slight weight gain with the implant.

7. Cost Comparison

IUDs may involve a higher upfront cost due to the procedure. However, their longer duration can make them more cost-efficient over time.

Implants may have a lower initial cost but require more frequent replacement, which can increase long-term expenses.

8. Suitability

IUDs
IUDs may be suitable for a range of women, particularly those who have completed childbearing or are certain they don’t want children in the next few years. Women who can tolerate hormonal birth control may find hormonal IUDs to be an effective option, as they can also reduce menstrual bleeding and cramps.

Additionally, a non-hormonal copper IUD can be suitable for those who prefer or need to avoid hormone-based contraception.


Implants may suit women who cannot tolerate oestrogen or prefer a progestin-only option. They may also benefit those with painful or heavy periods.

9. Convenience and Lifestyle Impact

IUDs
Some users may experience spotting or cramps after insertion. These usually reduce over time. Once settled, IUDs require no daily maintenance.

You can also find more information on IUD removal and what to expect during the process here.

Implants
Implants, on the other hand, are a good fit for women who experience painful or heavy periods, as the progestin-only hormone in the implant can reduce bleeding and pain. They are also ideal for women who cannot tolerate estrogen, making them a viable option for those who need to avoid combined hormonal contraceptives like the birth control pill.

IUD vs Other Birth Control Methods

When considering birth control options, it’s important to understand how IUDs compare with other methods, especially for those weighing long-term solutions against short-term convenience.

Each method comes with its own benefits and considerations, depending on personal lifestyle, medical history, and reproductive goals.

IUD vs Birth Control Pills

Birth control pills are taken daily and typically contain oestrogen and progestin or progestin alone. They require consistent daily use to maintain effectiveness, unlike IUDs, which provide continuous protection once inserted.

Pills may be suitable for those who prefer a non-invasive method but may not be ideal for individuals who find daily adherence challenging.

IUD vs Patch and Ring

The contraceptive patch is applied weekly, and the vaginal ring is changed monthly. These methods offer hormonal protection similar to pills but also require regular maintenance. IUDs differ in that they remain in place for several years without the need for ongoing user involvement.

IUD vs Injections

Contraceptive injections, such as the Depo-Provera shot, are administered every three months. While effective, they require scheduled visits to a clinic and may cause a delay in the return of fertility after discontinuation. IUDs, once removed, allow fertility to return more quickly for most individuals.

IUD vs Barrier Methods

Barrier methods like condoms or diaphragms must be used during each sexual encounter. While they are useful to prevent sexually transmitted infections, they tend to have lower effectiveness rates in preventing pregnancy compared to long-acting methods like IUDs.

IUD vs Fertility Awareness and Emergency Contraception

Fertility awareness methods rely on tracking ovulation and avoiding intercourse during fertile windows. These methods require diligence and are more variable in effectiveness. Emergency contraception is intended for occasional use and is not a long-term solution. IUDs provide a more consistent and long-term approach.

IUD vs Tubal Ligation

Tubal ligation is a permanent surgical procedure that involves sealing or cutting the fallopian tubes to prevent pregnancy. Unlike IUDs, which are reversible and non-surgical, tubal ligation is intended for individuals who are certain about not having more children. For those who prefer a non-permanent method, IUDs offer long-term but reversible protection.

Choosing Between IUDs and Implants

When deciding between intrauterine devices (IUDs) and implants for birth control, you must take into account their differences and what suits your body and lifestyle. It’s helpful to have a consultation with a healthcare professional. They offer personalised advice based on your medical history, lifestyle, and individual needs, prioritising your health and well-being.

Conclusion

IUDs and implants for birth control are both highly effective and reversible methods of contraception. They differ in terms of their duration, impact on periods, cost, suitability, side effects, and convenience.

The right choice depends on individual preferences and needs. Consult with a healthcare professional to help you determine what may suit your body and lifestyle.

To learn more about contraception options and other women’s health services, visit Ezra Clinic.

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AUTHOR

Dr Michelle Chia

Medical Director

After graduating from the National University of Singapore, Dr Michelle's journey allowed her to train in Women's Health and Aesthetic Medicine. Her experience has led her to be featured on multiple media platforms including Radio Stations and prominent Magazines like Her World, Women's Weekly and CLEO. Her work has also received recognition both locally and internationally in several Medical Conferences.

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