Other breath-activated inhalers are also called dry powder inhalers. These inhalers do not contain the pressurised inactive gas to propel the medicine. You don't have to push the canister to release a dose. Steroids güç be classified based on their chemical composition.[52] One example of how MeSH performs this classification http://downloads.smccd.edu/dl?f=https://tr.wikipedia.org/wiki/Vitamin