My son had his tonsils taken out at the beginning of this year, l...

My son had his tonsils taken out at the beginning of this year, last night I told him not to take the Singulair and so far so good. No coughing or wheezing. How long does this medication take to get out of his system? I'm not saying that Singulair didn't work for him it did, there was no coughing at night while he was on it unless he was sick, but at the same time I did read the side effects and just like every drug out there theres going to be side effects. I just didn't think that Singulair could be the cause of some of the problems he was having. I chalked it up as having ADD with depression. The psychiatrist didn't need to see him anymore and the neurologist said he was fine. As to the post of get him into sports he doesn't want too, and I can't make him. He's so small. I have asthma and I've dealt with it my whole life, I have the nebulizer and the inhalers, I know what to do if he has problems with allergies or asthma. I just didn't know what to do about his moodiness or depression and I sure as heck didn't want to have him put on another drug. I can't get him into the doctor until the end of March so I guess I'll just take him of the Singulair and see how he does.