Local anesthetic injection
A local anesthetic doesn't help with labor pain but might be used to numb the vaginal area if you need an incision to extend the opening of the vagina (episiotomy) or repair a tear after delivery. The medication is injected into the perineum or vaginal tissue and takes effect quickly.
Local anesthetics temporarily numb a specific area. Negative effects for mother or baby are rare.
Local anesthetics don't relieve the pain of contractions. An allergic reaction is possible. Rarely, injecting the medication into a vein might decrease your blood pressure.
A pudendal block might be used shortly before delivery to block pain between the vagina and anus (perineum). A local anesthetic is injected into the vaginal wall and takes effect in 10 to 20 minutes.
A pudendal block relieves pain in the lower vagina and perineum for up to an hour. Negative effects for mother or baby are rare.
A pudendal block might not work or affect only one side of the perineum. An allergic reaction is possible. Rarely, a pudendal block can cause an infection at the injection site, and injecting the medication into a vein might decrease your blood pressure.
Rarely, tranquilizers are used to relieve anxiety and promote rest in early labor or before a C-section. They might be injected into a muscle or given through an intravenous catheter and take effect in 10 to 20 minutes.
Tranquilizers relieve anxiety and promote relaxation for three to four hours.
Tranquilizers don't eliminate pain. They might cause drowsiness, decrease your memory of labor, and decrease your baby's muscle tone and activity at birth.
Nitrous oxide — an odorless, tasteless gas — is an inhalation analgesia that can be used during labor. You administer the anesthetic gas using a hand-held face mask. Nitrous oxide takes effect within a minute. While common in the United Kingdom and Canada, this technique is rarely used in the United States.
Nitrous oxide alters pain perception. It can be used intermittently or continuously during labor. If you need to have a tear repaired after delivery, you might use nitrous oxide as a supplement to a local anesthetic. Self-administration might give you a sense of control over your pain management. If you become too drowsy, you'll be unable to continue holding the mask to your face and stop inhaling the anesthetic — a built-in safety mechanism. Nitrous oxide has little or no effect on the baby.
Nitrous oxide doesn't eliminate pain. You might experience dizziness and nausea.
June 06, 2014
See more In-depth
- Anesthesia for labor and delivery. American Society of Anesthesiologists. http://www.lifelinetomodernmedicine.com/Types-Of-Anesthesia/Anesthesia-for-Labor-and-Delivery.aspx. Accessed March 17, 2014.
- Grant GJ. Pharmacologic management of pain during labor and delivery. http://www.uptodate.com/home. Accessed March 17, 2014.
- Grant GJ. Adverse effects of neuraxial analgesia and anesthesia for obstetrics. http://www.uptodate.com/home. Accessed March 17, 2014.
- Grant GJ. Neuraxial analgesia and anesthesia for labor and delivery: Options. http://www.uptodate.com/home. Accessed March 17, 2014.
- Grant GJ. Neuraxial analgesia and anesthesia for labor and delivery: Drugs. http://www.uptodate.com/home. Accessed March 17, 2014.
- Schatz M. Allergic reactions to local anesthetics. http://www.uptodate.com/home. Accessed March 17, 2014.
- Frequently asked questions. Labor, delivery and postpartum care FAQ086. Pain relief during labor and delivery. American College of Obstetricians and Gynecologists. http://www.acog.org/~/media/For%20Patients/faq086.pdf?dmc=1&ts=20140317T1358416691. Accessed March 17, 2014.
- Anesthesia options for labor and delivery: What every expectant mother should know. American Association of Nurse Anesthetists. http://www.aana.com/forpatients/Pages/Anesthesia-Options-for-Labor-and-Delivery-What-Every-Expectant-Parent-Should-Know.aspx. Accessed March 17, 2014.
- Vidaeff AC. Pudendal and paracervical block. http://www.uptodate.com/home. Accessed March 17, 2014.
- Gabbe SG, et al. Obstetrics: Normal and Problem Pregnancies. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2012. http://www.clinicalkey.com. Accessed March 17, 2014.
- Q & A: Pain management during childbirth. American Society of Anesthesiologists. http://www.lifelinetomodernmedicine.com/Anesthesia-Topics/QA-Pain-Management-During-Childbirth.aspx. Accessed March 17, 2014.
- Miller RD, et al. Miller's Anesthesia. 7th ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2010:1. http://www.clinicalkey.com. Accessed March 17, 2014.
- Cunningham FG, et al. Williams Obstetrics. 23rd ed. New York, N.Y.: The McGraw-Hill Companies; 2010. http://www.accessmedicine.com/content.aspx?aID=6024814. Accessed March 17, 2014.
- American College of Obstetricians and Gynecologists (ACOG) Committee on Practice Bulletins — Obstetrics. ACOG Practice Bulletin No. 36. Obstetric analgesia and anesthesia. International Journal of Gynecology & Obstetrics. 2002;78:321.
- Bucklin BA, et al. A Practical Approach to Obstetric Anesthesia. Philadelphia, Pa.: Lippincott Williams & Wilkins. 2009:143.
- Chestnut DH, et al. Chestnut's Obstetrics Anesthesia Principles and Practice. 4th ed. Philadelphia, Pa.: Mosby Elsevier. 2009;415.
- Halpern SH, et al. Effect of labor analgesia on labor outcome. Current Opinion in Anaesthesiology. 2010;23:317.
- Volmanen P, et al. Alternative to neuraxial analgesia for labor. Current Opinion in Anaesthesiology. 2011;24:235.
- Schrock SD, et al. Labor analgesia. American Family Physician. 2012;85:447.