<p><strong>By intravenous infusion</strong>: Initially 50 mcg/minute, increased gradually according to response by 50 mcg/minute every 10 minutes until contractions stop or maternal heart rate reaches 140 beats/minute; continue for 12&ndash;48 hours after contractions cease (usual rate 150&ndash;350 mcg/minute); maximum rate 350 mcg/minute.<br />
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<strong>Intramuscular injection</strong>: 10 mg in every 3&ndash;8 hours continued for 12&ndash;48 hours after contractions have ceased; then by mouth.<br />
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<strong>Oral maintenance treatment</strong>: One tablet (10 mg) may be given approximately 30 minutes before termination of intravenous therapy, repeated every 2 hours for 24 hours, followed by 10&ndash;20 mg every 4&ndash;6 hours, maximum oral dose 120 mg daily.</p>