Final answer:
The contraceptive described contains progestin released over time.
Step-by-step explanation:
The client is to receive an implantable contraceptive. Based on the information provided, the contraceptive described contains progestin released over time. Hormonal methods of contraception use synthetic progesterone to prevent ovulation, and the most reliable method is the implantation of the hormone under the skin. This method releases progestin over time to inhibit the release of FSH and LH, thus preventing an egg from being available for fertilization.