Understanding the Contraceptive Injection
Learn how the contraceptive injection works, its benefits, side effects, and how often it needs to be administered to prevent pregnancy.
Written by Dr. J T Hema Pratima
Reviewed by Dr. Shaik Abdul Kalam MD (Physician)
Last updated on 7th Aug, 2025
If you're looking for a reliable and convenient birth control method, the contraceptive injection might be a good option for you. This article will help you understand what it is, how it works, its benefits and side effects, and whether it’s the right choice for you.
What Is the Contraceptive Injection?
The contraceptive injection is a hormonal birth control method given as a shot in the arm or buttocks. It contains progestin, a hormone that prevents pregnancy by:
Stopping ovulation (the release of an egg from the ovary).
Thickening cervical mucus, making it harder for sperm to reach an egg.
Thinning the lining of the uterus, preventing a fertilised egg from attaching.
There are two main types:
1. Depo-Provera (DMPA): Given every 3 months.
2. Sayana Press (a newer version of DMPA): Can be self-injected every 3 months.
How Effective Is It?
When used correctly, the contraceptive injection is more than 99% effective at preventing pregnancy. However, missing a dose or getting the injection late can reduce its effectiveness.
Who Can Use the Contraceptive Injection?
Most women can safely use the contraceptive injection, but it may not be suitable for everyone. You should discuss it with your doctor if you:
Have a history of blood clots, heart disease, or stroke.
Have severe liver disease.
Have unexplained vaginal bleeding.
Are at high risk for osteoporosis (weakening of bones).
Are planning to get pregnant soon (fertility may take time to return after stopping).
Benefits of the Contraceptive Injection
1. Highly Effective: Works well when taken on time.
2. Long-Lasting: Only needed every 3 months.
3. Discreet: No daily pills or visible devices.
4. Reduces Periods: Many women experience lighter or no periods over time.
5. Non-Interfering: Doesn’t affect sex like condoms or diaphragms.
Possible Side Effects
Like all medications, the contraceptive injection may have some side effects, including:
Irregular periods (spotting or no periods at all).
Weight gain (some women gain a few pounds).
Mood changes (rarely, some feel mood swings or depression).
Headaches or breast tenderness.
Delayed return of fertility (may take up to a year after stopping).
Most side effects improve within a few months. If they persist, talk to your doctor.
Things to Keep in Mind
1. Bone Health: Long-term use (more than 2 years) may slightly weaken bones. Your doctor may recommend calcium and vitamin D supplements.
2. STI Protection: The injection does not protect against sexually transmitted infections (STIs). Use condoms if needed.
3. Missed Dose: If you delay your next shot beyond 12-14 weeks, use backup contraception (like condoms) until your next injection.
Is the Contraceptive Injection Right for You?
If you want a low-maintenance, long-acting birth control method and don’t mind injections, this could be a great choice. However, you may want to explore other options like pills, IUDs, or implants if you:
Want to get pregnant soon.
Prefer a method you can stop quickly.
Have concerns about bone health.
How to Get the Contraceptive Injection?
You’ll need a prescription from a doctor. At Apollo 24|7, you can:
Consult a gynaecologist online for advice.
Book an appointment for an in-person visit.
Get reminders for your next dose.
Conclusion
The contraceptive injection is a safe and effective birth control option for many women. If you’re considering it, talk to your doctor to see if it’s right for you.
Need expert advice? Schedule a consultation with an Apollo doctor today!
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