Terbutaline

It is a member of the family of medications which is in use for
1. stopping the contractions of preterm labor (tocolytics)
2. asthma

It is a beta 2 adrenergic receptor agonist.

Pharmacokinetics:
The inhaled form of terbutaline starts working in 10-15 minutes and lasts for about 5-6 hours.

Side effects:
It may cause tachycardia, pulmonary edema, hypokalemia and in fetus it may also cause hypoglycemia.

Further reading:
Beta 2-agonists in Asthma Treatment (Lung Biology in Health and Disease) by Romain Pauwels and Paul O. Byrne