Terbutaline
Terbutaline (top), and (R)-(−)-terbutaline (bottom) | |
| Clinical data | |
|---|---|
| AHFS/Drugs.com | Monograph |
| MedlinePlus | a682144 |
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| Routes of administration | Oral (tablets, oral solution), inhalational (DPI, nebulizer solution), SQ |
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| Legal status | |
| Pharmacokinetic data | |
| Protein binding | 25% |
| Metabolism | GI tract (oral), liver; CYP450: unknown |
| Elimination half-life | 11–16 hours |
| Excretion | urine 90% (60% unchanged), bile/faeces |
| Identifiers | |
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| CAS Number | |
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| CompTox Dashboard (EPA) | |
| ECHA InfoCard | 100.041.244 |
| Chemical and physical data | |
| Formula | C12H19NO3 |
| Molar mass | 225.288 g·mol−1 |
| 3D model (JSmol) | |
| Chirality | Racemic mixture |
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| (what is this?) (verify) | |
Terbutaline, sold under the brand names Bricanyl and Marex among others, 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. This time can then be used to administer steroid injections to the mother which help fetal lung maturity and reduce complications of prematurity. It should not be used to prevent preterm labor or delay labor more than 48–72 hours. In February 2011, the Food and Drug Administration began requiring a black box warning on the drug's label. Pregnant women should not be given injections of the drug terbutaline for the prevention of preterm labor or for long-term (beyond 48–72 hours) management of preterm labor, and should not be given oral terbutaline for any type of prevention or treatment of preterm labor "due to the potential for serious maternal heart problems and death."
It was patented in 1966 and came into medical use in 1970. It is on the World Health Organization's List of Essential Medicines.