Are Qvar and Avair for the same use? Can they be substituted for each other?

QVAR is indicated in the maintenance treatment of asthma as prophylactic therapy in patients 5 years of age and older. QVAR is also indicated for asthma patients who require systemic corticosteroid administration, where adding QVAR may reduce or eliminate the need for the systemic corticosteroids.

Beclomethasone dipropionate is NOT indicated for the relief of acute bronchospasm.

http://www.drugs.com/pro/qvar.html

ADVAIR HFA is indicated for the long-term, twice-daily maintenance treatment of asthma in patients 12 years of age and older.

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Long-acting beta2-adrenergic agonists, such as salmeterol, one of the active ingredients in ADVAIR HFA, may increase the risk of asthma-related death (see WARNINGS). Therefore, when treating patients with asthma, physicians should only prescribe ADVAIR HFA for patients not adequately controlled on other asthma-controller medications (e.g., low- to medium-dose inhaled corticosteroids) or whose disease severity clearly warrants initiation of treatment with 2 maintenance therapies. ADVAIR HFA is not indicated in patients whose asthma can be successfully managed by inhaled corticosteroids along with occasional use of inhaled, short-acting beta2-agonists.

ADVAIR HFA is NOT indicated for the relief of acute bronchospasm.

http://www.drugs.com/sfx/advair-hfa-side-effects.html

It is not recommended after reading the above, please seek medical attention before you switch meds, hope it helps?