1 inhalation (200 mcg) orally every 4 to 6 hours. Maximum dose: 4 inhalations (800 mcg) per day. Nebulizer inhalation solution: 2.5 mg three or four times a day by nebulization, over approximately 5 to 15 minutes. Oral tablets: Immediate-release tablets: Initial dose: 2 mg or 4 mg orally three or four times a day. More @Wikipedia
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