β2 adrenergic agonists are used in pulmonology as bronchodilators, in obstetrics as tocolytic agents, and to manage patients with hyperkalemia. There are both short-acting and long-acting β2 agonists, and their duration of action determines their clinical application. Their effects are achieved through β2 receptor stimulation. Side effects are partially mediated by the β1 receptor and include anxiety and tremor, as well as life-threatening conditions such as ventricular arrhythmias.
All β2 adrenergic agonists selectively stimulate β2 adrenergic receptors.
- Relaxes bronchial smooth muscle
|Characteristic||Agent||Onset of action||Duration of action|
|Short-acting beta agonists (SABA)|| || || |
|Long-acting beta agonists (LABA)|| || || |
| || |
- Cardiac: : ventricular arrhythmias; , vasoconstriction, angina pectoris, tachycardia, and palpitations; may aggravate cardiomyopathy in patients with cardiovascular disease
- Central nervous system/muscular: tremor, headache, anxiety, and sleep disturbances
- Development of tolerance
Paradoxical bronchospasm may occur!
We list the most important adverse effects. The selection is not exhaustive.
- Bronchial : used to achieve spasmolysis of the bronchi.
- : used to achieve spasmolysis of the bronchi.
- : used for /undesired contractions in obstetricstocolysis
- : Beta-2 adrenergic agonists drive K+ intracellularly.
- Absolute contraindication: hypersensitivity to β2 adrenergic agonists
- Use with caution in patients with the following conditions:
We list the most important contraindications. The selection is not exhaustive.
- A face mask is recommended for children < 4 years on inhalational therapy.