I was on montelukast singular tablets for 2 weeks but I reacted to them. The doctor told me to stop taking them and see how I feel. I booked another appointment with him but now we are snowed in. He says to start taking them again because its more important I can breath then feeling all dizzy. I have to wait another 3 days to see him. Will the tablets make my asthma better immedeatly or will it take a few days?