Very rare cases of drowsiness or dizziness which may affect ability to drive & use machines. Renal & hepatic impairment. Pregnancy & lactation. Levocetirizine: Epileptic patients & patients at risk of convulsion. Concomitant use w/ alcohol. Not recommended in childn <6 yr. Montelukast: Not to be used to treat acute asthma attacks. Not to be abruptly substituted for inhaled or oral corticosteroids. Rare cases of systemic eosinophilia, sometimes presenting w/ clinical features of vasculitis consistent w/ Churg-Strauss syndrome. Reassess patients who develop eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications, &/or neuropathy, & evaluate treatment regimens. Does not alter the need for patients w/ aspirin-sensitive asthma to avoid taking aspirin & other NSAIDs. Childn 6 mth-2 yr.
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