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Commonly used tocolytic medications include β 2 agonists, calcium channel blockers, NSAIDs, and magnesium sulfate. These can assist in delaying preterm delivery by suppressing uterine muscle contractions and their use is intended to reduce fetal morbidity and mortality associated with preterm birth. [ 2 ]
Terbutaline, sold under the brand names Bricanyl and Marex among others, is a β 2 adrenergic receptor agonist, used as a "reliever" inhaler in the management of asthma symptoms and as a tocolytic (anti-contraction medication) to delay preterm labor for up to 48 hours.
Beta adrenergic agonists or beta agonists are medications that relax muscles of the airways, causing widening of the airways and resulting in easier breathing. [1] They are a class of sympathomimetic agents, each acting upon the beta adrenoceptors. [2]
Salbutamol and terbutaline are also both available in oral forms. [11] In addition, several of these medications are available in intravenous forms, including both salbutamol and terbutaline . It can be used in this form in severe cases of asthma , but it is more commonly used to suppress premature labor because it also relaxes uterine muscle ...
Ritodrine, sold under the brand name Yutopar, is a tocolytic drug used to stop premature labor. [2] [3] This drug has been removed from the US market, according to FDA Orange Book. It was available in oral tablets or as an injection and was typically used as the hydrochloride salt. The drug acts as a selective β 2-adrenergic receptor agonist. [4]
One dose of LSD in a clinical trial significantly improved anxiety and lasted for 12 weeks, convincing the FDA to give the drug a breakthrough therapy designation.
Terbutaline: Combination of N-t-butyl and a resorcinol phenyl ring that gives potency to the β2-receptor. [14] Albuterol (Salbutamol) Has N-t-butyl and a salicyl alcohol phenyl ring which gives it optimal β2-selectivity. [14] Salbutamol is a short-acting β2-agonist, but has a rapid onset of action. [18] Its onset by inhalation is within 5 ...
Administration of tocolytic treatment with β2-adrenergic drugs has shown to stabilize uterine contractions while also effectively lowering Fetal Heart Rate. The usage of a balloon catheter to induce labor rather than Prostoglandin E 2 lowers the risk of uterine hyperstimulation and its effect on fetal heart rate.