6mos w/perennial allergic rhinitis or <2yrs w/seasonal allergic rhinitis: not established. 6–23mos: one 4mg granule packet. 2–5yrs: one 4mg chew tab or granule packet. 6–14yrs: one 5mg chew tab.

Singulair, originally sold by Merck & Co., is a prescription drug that was launched in 1998 and is used to prevent and treat symptoms of asthma and allergies ... to a sugar pill, according ...