Women should not use implants if they: * are, or think they are, pregnant * are allergic to<unk>  * have vaginal bleeding that has not been explained * have some forms of severe liver disease. Women should not use combined hormone contraceptives (CHC) if they have migraines with auras. A full list of contraindications can be found in the WHO Medical Eligibility Criteria for Contraceptive Use 2015 and the CDC United States Medical Eligibility Criteria for Contraceptive Use 2016.
Etonogestrel
Levonorgestrel
Gestodene
Desogestrel
Norgestrel
Chloroethynylnorgestrel
5α-Dihydrolevonorgestrel
Hexestrol