1. Patients with severe cardiac insufficiency, tachycardia, aortic stenosis, obstructive hypertrophic cardiomyopathy and hyperthyroidism are prohibited.

2. Use with caution in patients with arrhythmia, angina, cardiac insufficiency, essential hypertension, diabetes and severe hypokalemia.

3. Common anxiety, dizziness, headache, etc.

4. Occasional local irritation and skeletal muscle tremor.

5. Palpitation, tachycardia and other reactions were visible.

6. Long-term application may produce tolerability.

7. When combined with theophylline, it can enhance the relaxation of bronchial smooth muscle and also increase adverse reactions.

8. When used in combination with other adrenergic agonists, it can enhance the therapeutic effect and also aggravate the decrease of serum potassium.

9. Combined with monoamine oxidase inhibitor, it can increase adverse reactions such as tachycardia, excitement and hypomania.

10. Children should use this product under supervision