Nebulizer can be safely used even 3 to 4 times a day and if relief is not obtained then one must consider reporting to ER , as sometimes if nebulization is taken late , then bronchial asthma attack can aggravate when intravenous bronchodilators are required, else mouth puffs are the best way to control asthma.
I hope i have answered your query,
wishing you good health,
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