It can also act on β₂-adrenoceptors in uterus.

Dosing Summary

Dosage may vary by age, condition, and formulation. Below is a general guide:

Asthma Symptoms & Bronchospasm

Inhaler (100 mcg/dose):

• Adults: 1–2 puffs every 4 hrs (max 8 puffs/day). Preventive: 2 puffs 15 min before trigger.
• Children: 1 puff (up to 2 if needed) every 4 hrs (max 8/day). Preventive: 1–2 puffs before trigger.

Dry Powder Inhaler (200 mcg/dose):

• Ages 4+: 1 inhalation up to 4× daily. Preventive: 1 inhalation 10–15 min before trigger.

Oral Syrup (2 mg/5 ml):

• Adults: 5–20 ml, up to 4× daily.
• Children 12+: 5–10 ml, 3–4× daily.
• Children 6–12: 5 ml, 3–4× daily.
• Children 2–6: 2.5–5 ml, 3–4× daily.
• Elderly: 5 ml, up to 3× daily.

Tablets (2 mg, 4 mg):

• Adults: 4 mg 3–4× daily, may increase to 8 mg. Some respond to 2 mg.
• Children 12+: 2–4 mg, 3–4× daily.
• Children 6–12: 2 mg, 3–4× daily.
• Children 2–6: 1–2 mg, 3–4× daily.
• Elderly: Start with 2 mg, 3–4× daily.

Nebulizer Solution (5 mg/ml):

• Adults & Teens: 0.5–1 ml (2.5–5 mg), up to 4× daily.
• Children (18 mo–12 yrs): 0.5–1 ml, up to 4× daily.
• Continuous: 1–2 mg/hr via dilution and nebulization.

Severe Asthma (Status Asthmaticus)

Injection (500 mcg/ml):

• Adults: 500 mcg SC/IM every 4 hrs as needed.

IV Infusion (5 mg/5 ml):

• Adults: 250 mcg slow IV; infusion 3–20 mcg/min based on response.

Preterm Labor (IV Infusion)

Solution (5 mg/5 ml):

• Infusion: 10–45 mcg/min, adjusted to uterine activity.

Always refer to full prescribing information for detailed guidance.