Yes, Ascoril LS (200ml) causes drowsiness. A combination of the drug ambroxol and levosalbutamol causes drowsiness and dizziness. It is not essential that every patient experience this side effect. However, avoid driving if you feel drowsy and dizzy after taking Ascoril. You are also advised not to consume alcohol for approximately 24 hours after taking Ascoril LS, as you will feel severe drowsiness and dizziness.