2 years old and upward, full dose. From 1 to 2 years old, ¹⁄₂ dose. From ¹⁄₂ to 1 year, ¹⁄₄ dose. From 3 to 6 months, ¹⁄₈ dose. From 1 to 3 months, ¹⁄₁₆ dose.