Other breath-activated inhalers are also called dry powder inhalers. These inhalers do derece contain the pressurised inactive gas to propel the medicine. You don't have to push the canister to release a dose. An acute exacerbation is more commonly known as a 'flare-up'. An acute exacerbation of chronic obstructive pulmonary https://case.edu/cgi-bin/newsline.pl?URL=https://tr.wikipedia.org/wiki/Vitamin