Advise patients never to use oral montelukast to treat acute asthma attacks & to keep their usual appropriate rescue medication. Should not be substituted for inhaled or oral corticosteroids. Physicians should be alert to eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications &/or neuropathy presenting in their patients. Treatment w/ montelukast does not alter the need for patients w/ aspirin-sensitive asthma to avoid taking aspirin & other NSAIDs. Restriction of use in allergic rhinitis. Serious neuropsychiatric events (eg, agitation, aggressive behavior or hostility, anxiousness, depression, disorientation, disturbance in attention, dream abnormalities, dysphemia, hallucinations, insomnia, irritability, memory impairment, obsessive-compulsive symptoms, restlessness, somnambulism, suicidal thoughts & behavior, tic, & tremor). Patients w/ rare hereditary problems of galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption should not take this medicine. Patients w/ severe hepatic impairment. Pregnancy & lactation. Do not give to childn <15 yr.