Ritodrine hydrochloride, also known as hydroxybenzyl hydroxyephedrine. Modern pharmacological studies show that ritodrine is β- Sympathetic drugs are adrenergic β 2 receptor agonist, which is the only fetal protection drug approved by FDA. Its half-life is between 1.5-2.5h, and the effect is fast. It can be used as an effective uterine contraction inhibitor for the prevention and treatment of preterm birth. Ritodrine, as a fetal protective drug to inhibit uterine contraction, has little side effects. If the cases are strictly selected, the indications are well mastered, the drug is used rationally and closely monitored, it is a safer drug.
It passes through the surface of uterine myocytes β 2 receptor binding, activate adenylate cyclase of cell membrane, convert adenosine triphosphate into cyclic adenosine monophosphate, reduce myosin light chain kinase activity, inhibit the release of calcium from sarcoplasmic reticulum and reduce the concentration of calcium ions in cells, so as to inhibit the contraction of uterine muscle fibers.
It is used to prevent preterm birth after 20 weeks of pregnancy. The best dose depends on the balance between uterine reaction and adverse reaction. Intravenous drip can be used when there is recurrent uterine contraction. Infusion pump should be used to control the dropping speed during intravenous drip.