Taking a higher than the recommended dose of Ventorlin Syrup may cause seizures, chest pain, nervousness, headache, dry mouth, nausea, dizziness and lack of energy. High doses of Ventorlin Syrup may also cause fast, irregular or pounding heartbeat, uncontrollable shaking of any part of the body, and difficulty falling asleep or staying asleep. In any such case, seek immediate medical attention.