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Misoprostol

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Misoprostol

Key Points

  • Misoprostol is a synthetic prostaglandin E1 analog with cytoprotective and uterotonic properties.
  • Gastric indication: Prevents NSAID-induced gastric ulcers by inhibiting acid secretion and enhancing mucosal defense.
  • Reproductive indications include medication-abortion regimens (with mifepristone), cervical ripening, labor induction, and management of postpartum hemorrhage.
  • Absolutely contraindicated in pregnancy for gastric indications because it causes uterine contractions.

Mechanism of Action

Misoprostol replaces protective prostaglandins depleted by NSAID therapy. It inhibits gastric acid secretion, stimulates mucus and bicarbonate production, and enhances mucosal blood flow. In obstetric use, it stimulates uterine smooth-muscle contractions by binding to myometrial prostaglandin receptors.

Indications

  • Prevention of NSAID-induced gastric ulcers in high-risk clients.
  • Medication abortion as part of combined regimens after mifepristone in early gestation protocols.
  • Cervical ripening before labor induction.
  • Medical management of early pregnancy loss.
  • Postpartum hemorrhage treatment (when other agents fail).

Nursing Considerations

  • Gastric use: Verify negative pregnancy test before initiating in women of childbearing age; prescribe only with confirmed contraception.
  • Gastric use: Typical regimen is 200 mcg orally with food 4 times daily while NSAID therapy continues; if poorly tolerated, 100 mcg dosing may be used per prescriber order.
  • Review interaction risk with oxytocin because combined uterotonic effects can increase contraction-related harm.
  • Obstetric use: Monitor uterine contraction pattern, fetal heart rate, and maternal vital signs during cervical ripening.
  • Medication-abortion use: Verify gestational-age eligibility, confirm clear follow-up plan, and reinforce emergency return thresholds for heavy bleeding, fever, or severe persistent pain.
  • Assess for uterine tachysystole (excessive contractions) during obstetric use.
  • Do not administer for cervical ripening if client has prior cesarean scar or uterine surgery (uterine rupture risk).
  • Administer as ordered (oral, sublingual, vaginal, or rectal depending on indication and institutional protocol).

Side Effects and Adverse Effects

  • GI (gastric use): Diarrhea (dose-related, most common), abdominal cramping, nausea, flatulence.
  • Gynecologic effects: Dysmenorrhea, spotting, uterine cramping, and postmenopausal bleeding can occur.
  • Obstetric use: Uterine tachysystole, nausea, vomiting, diarrhea, fever, chills.
  • Serious: Uterine rupture (risk with prior uterine surgery), fetal distress from excessive contractions.

Pregnancy Contraindication (Gastric Use)

Misoprostol is classified as an abortifacient. When prescribed for gastric protection, it is absolutely contraindicated in pregnancy and requires documented negative pregnancy test and reliable contraception.

Health Teaching

  • For gastric use: take with food; diarrhea is common and usually resolves within a week.
  • Women of childbearing age must use reliable contraception and report suspected pregnancy immediately.
  • Report abnormal vaginal bleeding, worsening uterine cramping, or severe abdominal pain promptly.
  • For obstetric use: inform client about expected cramping and contraction onset; report severe pain or excessive bleeding.
  • nsaids - Primary drug class requiring gastroprotection with misoprostol.
  • postpartum-hemorrhage - Uterotonic use context in obstetric emergencies.
  • Labor Induction Cervical Ripening Methods - Cervical ripening indication context.

Self-Check

  1. Why is misoprostol contraindicated in pregnancy when used for gastric ulcer prevention?
  2. What monitoring is essential during misoprostol use for cervical ripening?
  3. How does the mechanism of action differ between gastric and obstetric indications?

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