Which statement about contraceptive injections is true?

The statement regarding contraceptive injections that is true is that fertility may take time to return once injections stop. This reflects the pharmacological effects of the hormones involved in contraceptive injections, such as depot medroxyprogesterone acetate (DMPA). These injections work by suppressing ovulation, and when a person discontinues use, it can take some time for their hormonal levels to return to normal and for ovulation to resume. As a result, while some individuals may regain fertility shortly after stopping the injections, others may experience a delay in the return of normal menstrual cycles and fertility.

In contrast, the other statements are not correct regarding the nature of contraceptive injections. They do not guarantee immediate fertility after stopping because the body may need time to readjust hormone levels. They also do not require a monthly medical examination; follow-up appointments are typically less frequent, often only needed every three months or so, depending on the specific injection used. Lastly, they do not provide contraception for an unlimited duration, as the effects last only for a limited time (usually around three months for DMPA) and require ongoing administration to maintain contraceptive effects.