Gynecology Book

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Implanon

Aka: Implanon, Nexplanon, Etonogestrel Drug Implant, Progesterone Implant, Contraceptive Implant
  1. Definition
    1. Subcutaneous inserted Progestin containing rod
  2. Background
    1. Duration: Continuous Contraception for 3 years
    2. Progestin: Etonogestrel
    3. Release rate
      1. Initial: 60-70 mcg/day
      2. Tapers to 30 mcg/day
    4. Rod dimensions: (Lenth: 40 mm, Diameter 2 mm)
  3. Efficacy
    1. Nexplanon Failure rate: 1 per 2000 users
      1. Failure rate may be higher if >130% of Ideal Weight
      2. Several medications lower efficacy (see below)
      3. Implanon had a higher failure rate (1 in 1000) attributed to insertion technique
  4. Drug Interactions: Medications that lower efficacy
    1. Phenobarbital and other barbiturates
    2. Phenytoin, Fosphenytoin and other Hydantoins
    3. Carbamazepine
    4. Griseofulvin
    5. Protease Inhibitors
    6. Primidone
  5. Safety
    1. Safe in Lactation
    2. Ovulation resumes within 3 weeks of removal
  6. Adverse effects
    1. Weight gain
    2. Acne Vulgaris
    3. Depression or Emotional lability
    4. Irregular Menstrual Bleeding
      1. Amenorrhea most common
      2. Menorrhagia
        1. Bleeding 50% less with Doxycycline 100 bid x5 days
        2. Weisberg (2006) Human Reproduction 21:295-302 [PubMed]
  7. Procedure: Insertion (<5 minutes)
    1. No incision needed
    2. Nexplanon comes inn Preloaded applicator
    3. Inserted into subcutaneous skin of arm
    4. Both patient and physician must palpate rod post-insert
  8. Procedure: Removal (<10 minutes)
    1. Infiltrate local anesthetic under Implanon
    2. Incision of 2-3 mm at distal tip of Implanon
    3. Nexplanon pushed from proximal end into incision
      1. Consider scraping with scalpel
    4. Make incision through fibrous sheeth around Implanon
    5. Remove by grasping Nexplanon rod with forceps
    6. Pearls for difficult removal
      1. Ultrasound if device cannot be palpated
      2. Middle of implant the only palpable part
        1. Make incision over palpable rod and grasp with vas clamp or curved hemostat
  9. Protocol: Switching between contraceptives
    1. Starting Nexplanon
      1. Use pill, patch, ring, or barrier protection for the first 4 days after Implanon insertion
      2. Switch may be made before the scheduled end of use of the prior contraceptive
  10. References
    1. Welsh (2006) New Contraceptives, Lecture, Wyoming, MN
    2. Funk (2005) Contraception 71:319-26 [PubMed]
    3. Prine (2018) Am Fam Physician 98(5): 304-9 [PubMed]

Implanon (C0673606)

Concepts Pharmacologic Substance (T121) , Steroid (T110)
MSH C044815
English Implanon, implanon, Nourypharma brand of 3-keto-desogestrel, Organon brand of 3-keto-desogestrel
Sources
Derived from the NIH UMLS (Unified Medical Language System)


Contraceptive implant (C1657106)

Definition (NCI) A drug implant that acts as a birth control device and which is inserted under the skin for drug delivery into the body.
Concepts Finding (T033)
English Contraceptive Implant, Contraceptive implant, contraceptive implant, Contraception;implant
Czech Antikoncepční tělísko
Dutch anticonceptie-implantaat
French Implant contraceptif
German Empfaengnisverhuetendes Implantat
Hungarian Fogamzásgátló implantatum
Italian Impianto contraccettivo
Japanese ヒニンヨウインプラント, 避妊用インプラント
Portuguese Implante contraceptivo
Spanish Implante anticonceptivo
Sources
Derived from the NIH UMLS (Unified Medical Language System)


Nexplanon (C3159354)

Concepts Pharmacologic Substance (T121)
MSH C044815
English Nexplanon, nexplanon
Sources
Derived from the NIH UMLS (Unified Medical Language System)


Etonogestrel Drug Implant [Nexplanon] (C3159356)

Concepts Clinical Drug (T200)
English Etonogestrel Drug Implant [Nexplanon]
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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