Singulair is a popular prescription for general outdoor allergies. As someone who is allergic to trees, molds, grasses, pets, dust, etc. I take multiple medications. This medication works well with other medications to generally soften the effects of allergies. While this medication won't work by itself against the itchy, burning eyes or a stuffy or runny nose, it will help the body's immune reaction to the allergens.
Since the pill is taken once daily, it's probably best to take it at the exact same time everyday. The packaging and pills are unique so they are not easily mixed up with other pills. No powdery mess, no blister packs to get rid of (a seal could choke on those and die), I think the medication is worth the price.