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. Longer-acting steroid injections may take about a week to become effective but birey then be effective for https://intern.ee.aeust.edu.tw/home.php?mod=space&uid=971708