asthma
"I was taking Singulair along with Advair for several years. Did not think that it really did that much for me but the Doctor advised me to take it. Only after my sister said she stopped taking it because of leg cramps did I connect the "dots".  I had been having such terrible leg cramps but no one would say it was because of Singular. I stopped taking it and after 3  months I no longer have the leg cramps."