Injectable hormonal contraceptives occupy a primary position in family planning services across Nigeria. Midwives frequently encounter clients requesting these methods due to their discretion, high efficacy, and convenience. In many primary healthcare clinics and rural outreach posts, injectables serve as the most widely accepted modern contraceptive. Understanding their use requires familiarity with both clinic-based presentations and newer subcutaneous formulations that facilitate task-shifting and community-based distribution. Midwives must provide accurate, non-judgmental information to help Nigerian women make informed reproductive choices.
Two main progestin-only injectable formulations are prevalent in Nigerian practice: Depot Medroxyprogesterone Acetate given intramuscularly (DMPA-IM) and DMPA administered subcutaneously (DMPA-SC), commonly known by the brand name Sayana Press.
Progestin-only injectables prevent pregnancy primarily through the suppression of ovulation. The sustained release of progestin inhibits the mid-cycle surge of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Secondary mechanisms include thickening the cervical mucus, which creates a physical barrier that impedes sperm transport into the upper reproductive tract, and altering the endometrium, rendering it unfavorable for blastocyst implantation. When used consistently and on schedule, injectables demonstrate a typical failure rate of less than 1 per 100 women in the first year of use.
Proper technique ensures accurate drug delivery and minimizes client discomfort. For DMPA-IM, the midwife must shake the vial gently, select a deep muscle site (ventrogluteal is preferred over dorsogluteal to avoid the sciatic nerve), clean the skin, and administer the full dose without massaging the site afterward. For Sayana Press, the midwife inspects the Uniject device, removes the needle cap, pinches a fold of skin in the anterior thigh or abdomen, inserts the needle at a 45-degree angle, and depresses the reservoir completely. Midwives should instruct clients never to massage an IM injection site, as rapid absorption can alter hormone levels.
Before administering an injectable, the midwife uses the WHO Medical Eligibility Criteria for Contraceptive Use (MEC) to screen for health conditions. DMPA is classified as MEC Category 1 (no restriction) for most women, including adolescents and breastfeeding mothers after six weeks postpartum. However, conditions like active breast cancer, severe cirrhosis, and unexplained vaginal bleeding fall under Category 3 or 4, where risks generally outweigh benefits or the method is contraindicated. Blood pressure screening is required, though controlled hypertension remains an MEC Category 1 or 2 condition depending on severity.
Menstrual pattern changes represent the most frequent reason clients discontinue injectables. Midwives must explain that amenorrhea, irregular spotting, or prolonged bleeding are normal physiological responses to continuous progestin exposure. Weight gain, mild headaches, mood changes, and temporary decreases in bone mineral density are also documented. Reassuringly, bone density losses are fully reversible after discontinuation. Pre-injection counseling reduces anxiety and builds compliance by preparing the client for these predictable side effects.
A common misconception among Nigerian women is that injectable contraceptives cause permanent infertility. Midwives play a vital role in dispelling this myth. While fertility does not return immediately upon stopping, ovulation typically resumes within four to ten months after the last injection wears off. However, for some women, a delay of up to twelve to eighteen months can occur before normal ovulatory cycles and pregnancy are achieved. This temporary delay must be communicated during pre-insertion counseling to clients who plan to conceive in the near future.
The availability of Sayana Press has introduced self-injection, empowering clients to administer the contraceptive themselves at home. Midwives train interested clients during clinic visits using demonstration models. The training covers hand hygiene, site preparation, proper subcutaneous injection technique, safe needle disposal in a safety box, and tracking the next injection date. This self-care approach improves continuation rates, reduces clinic congestion, and expands access to family planning in remote Nigerian communities.