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  • Title: Influence of ritodrine on plasma steroids and human placental lactogen levels in third-trimester pregnancies.
    Author: Schreyer P, Zer Y, Ariely S, Herman A, Caspi E.
    Journal: Gynecol Obstet Invest; 1989; 27(1):10-3. PubMed ID: 2920966.
    Abstract:
    The effects of ritodrine, administered by intravenous, intramuscular or per os routes, upon plasma levels of unconjugated estriol, estradiol, progesterone and human placental lactogen (HPL) were investigated in 24 third-trimester pregnancies. Ritodrine administered at a constant rate of 200 micrograms/min for 3 h, injected intramuscularly 8 x 10 mg/day for 5 days or given orally in doses of 6 x 20 mg/day for 10 days resulted in a significant decrease in the steroid hormone concentration and a significant elevation of HPL levels.
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