I was on Singulair for a few years. I started seasonally and even...

I was on Singulair for a few years. I started seasonally and eventually stayed on it all year. It kept my mild asthma and seasonal allergies completely in control to the point where I no longer felt like I had those problems. Even after cold viruses, my peak flows never dropped as far and it didn't take as many weeks to recover peak flow. As a singer, that was very important to me. Then I spent a year barely able to walk from the severe leg cramps and pain and swelling. My GP was stumped and I had several diagnostic and blood tests that ruled out all the possibilities she could think of. Then I called up Glaxo and asked if it could be the Singulair? Yes, in rare cases it causes edema and/or muscle cramps. My doc took me off and the problems faded away and I'm back to walking. But now my asthma is not doing as well back on the older drugs. Sigh.