This combination syrup (containing levosalbutamol, ambroxol, and guaifenesin) is generally safe for children to help relieve a wet cough, but it should only be given under a doctor's guidance. The recommended dosage depends entirely on your son's age, weight, and specific symptoms. Giving an incorrect dose can sometimes cause mild side effects like shakiness or a fast heartbeat. To keep your son safe, please avoid self-medication and consult your pediatrician. They will evaluate him and prescribe the exact, safe dosage tailored to his needs.