My daughters allergist put her on Singulair. It was my understanding it should help the sinus drainage, allergies & asthma. After months on Singulair I couldn't tell she was any better. The side effects for her was joint paint from the Singulair so I decided to take her off it. I tried her on allegra & Claritin & couldn't tell much difference on them either. At present she takes Benadryl when she has a sinus drainage. Good luck!