For an adult, the standard dosage of Macbery syrup (containing levosalbutamol, ambroxol, and guaifenesin) is typically 10 ml (two teaspoonfuls) taken twice daily, or as specifically directed by your physician. It is recommended to take it after meals to minimize any stomach irritation. Please use the measuring cup provided with the bottle for accurate dosing. If you are inquiring for a child, the dosage is significantly lower and must be determined strictly by a pediatrician based on the child's weight. Never exceed the prescribed dose, and consult your doctor before starting the medication.