Terbutaline; Indications/Uses, Dosage, Side Effects, Drug Interaction ,Pregnancy

Terbutaline; Indications/Uses, Dosage, Side Effects, Drug Interaction ,Pregnancy

Terbutaline is a selective beta-2 adrenergic agonist used as a bronchodilator and tocolytic. Terbutaline Sulfate is the sulfate salt form of terbutaline, an ethanolamine derivative with bronchodilating and tocolytic properties. Terbutaline sulfate selectively binds to and activates beta-2 adrenergic receptors, leading to intracellular adenyl cyclase activation via a trimeric G protein and subsequent increase in cyclic cAMP production. Increased cAMP levels result in relaxation of bronchial and vascular smooth muscle mediated through the activation of protein kinase A (PKA), which phosphorylates proteins in control of muscle tone. cAMP also inhibits calcium ion release from intracellular stores, reduces calcium entry into cells and induces the sequestration of intracellular calcium all of which aids the relaxation of airway muscles. Terbutaline sulfate also increases mucociliary clearance and reduces the release of inflammatory cell mediators.

Terbutaline is a β2 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.

Mechanism of Action of Terbutaline

The pharmacologic effects of terbutaline are at least in part attributable to stimulation through beta-adrenergic receptors of intracellular adenyl cyclase, the enzyme that catalyzes the conversion of adenosine triphosphate (ATP) to cyclic- 3′,5′- adenosine monophosphate (c-AMP). Increased c-AMP levels are associated with relaxation of bronchial smooth muscle and inhibition of release of mediators of immediate hypersensitivity from cells, especially from mast cells.


  • Bronchospasm
  • Premature Labour




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