--Salbutamol: Tremor, nervous tension, headache, peripheral vasodilatation, muscle cramps, palpitations, tachycardia, arrhythmia, hypokalemia, hyperactivity in children. Guaifenesin: Dizziness, headache, rash, nausea, vomiting, stomach pain. Ambroxol: Gastrointestinal side effects, skin reactions, mild increase in serum aminotransferase values.