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Tocolytic
Aka: Tocolytic, Tocolysis
- See Also
- Preterm Labor Management
- Indications
- Preterm Labor
- Contraindications (See specific medications)
- Fetal Bradycardia <100
- Fetal Tachycardia >180
- Maternal Systolic Blood Pressure <90 mmHg
- Shortness of Breath
- Chest Pain
- Medications
- General Indications
- Stops labor for 24-48 hours
- Allows maternal transport or steroid doses above
- Magnesium Sulfate
- Dosing: Start with 4-6 g bolus IV over 20 min, then 1-2 g/h (maximum 3 g/h)
- Does not prevent preterm birth
- Gyetvai (1999) Obstet Gynecol 94:869-77
- Terbutaline
- Effective at temporarily stopping contractions
- Results in shortest hospital triage stays
- Guinn (1997) Am J Obstet Gynecol 177:814-87
- Oral Terbutaline is not effective in Preterm Labor
- Lewis (1996) Am J Obstet Gynecol 175:834-7
- Ritodrine (only FDA approved Preterm Labor Tocolytic)
- Not shown to be more effective than Placebo
- (1992) N Engl J Med 327:308-12
- Indomethacin (Indocin)
- Dosing: Start 50-100 mg orally and then maintain at 25-50 mg orally every 4 hours for 48 hours
- Not recommended after 32 weeks due to ductus arteriosus constriction
- Nifedipine (Procardia)
- Start at 30 mg oral loading dose, then 10-20 mg every 4-6 hours
- Mixed results on efficacy, however recent studies suggest very effective
- References
- Berkman (2003) Am J Obstet Gynecol 188:1648-59
- Sayres (2010) Am Fam Physician 81(4): 477-84