Injectable contraceptives are hormonal medications administered via intramuscular or subcutaneous injection to prevent pregnancy. They offer discreet, highly effective, and reversible family planning. In Nigeria, where maternal health advocacy relies heavily on community-level interventions, injectables are among the most popular modern contraceptive methods due to their ease of use and privacy.
Client confidentiality makes this method attractive to young women and individuals who prefer keeping their contraceptive use private from partners or family members.
Progestin-only injectables work through three primary physiological pathways to prevent conception:
These combined actions yield a typical-use failure rate of less than one percent when injections are taken strictly on schedule.
Family planning clinics across Nigeria primarily stock two major progestin-only formulations, alongside emerging combination options. Understanding the distinct schedules for each product ensures proper client scheduling and prevents unintended pregnancies.
| Generic Name | Brand Example | Dose & Route | Schedule |
|---|---|---|---|
| Depot Medroxyprogesterone Acetate | Depo-Provera | 150 mg IM / 104 mg SC | Every 3 months (13 weeks) |
| Norethisterone Enanthate | Noristerat | 200 mg IM | Every 2 months (8 weeks) |
Subcutaneous DMPA formulations are also gaining traction because they can sometimes be self-administered by clients after proper training by a nurse.
The World Health Organization Medical Eligibility Criteria (WHO MEC) guides nurses in determining whether a client can safely use injectable contraceptives. The criteria categorize conditions from Category 1 (no restriction) to Category 4 (unacceptable health risk).
Injectables are generally safe for breastfeeding mothers, women with controlled hypertension, and those with uncomplicated diabetes. However, active breast cancer, severe liver disease, and unexplained vaginal bleeding require thorough medical evaluation before initiation.
Proper administration ensures maximum drug efficacy and minimizes local tissue trauma at the injection site. For intramuscular DMPA, shake the vial gently, select the ventrogluteal or deep deltoid muscle, and use a sterile needle.
Users frequently experience changes in bleeding patterns, which is the leading reason for discontinuation. Amenorrhea (absence of menses), irregular spotting, or prolonged bleeding are normal physiological responses to continuous progestin exposure.
Other reported effects include mild weight gain, mood fluctuations, and temporary headaches. A widespread misconception in many Nigerian communities is that injectable contraceptives cause permanent infertility or accumulate dirt in the womb. Nurses must actively dispel these myths during counseling, assuring clients that fertility returns after discontinuation, though sometimes with a delay.
Effective counseling builds trust and improves continuation rates. Nurses should use the BRAIDED framework (Benefits, Risks, Alternatives, Inquiries, Disadvantages, Explanation, Documentation) to structure counseling sessions.
A notable characteristic of progestin-only injectables is the delayed return to ovulation after discontinuation. While oral contraceptives clear the body within days, depot formulations can linger in fat tissue.