Flexhaler or Pulmicort Flexhaler is a portable multi-dose asthma inhaler. Flexhaler is a type of dry powdered inhaler (DPI) meaning this device delivers medicine in a fine powder form without the use of propellants. The medicine is an inhaled corticosteroid that contains budesonide which is an anti-inflammatory. If used on a regular basis Flexhaler helps reduce the severity of asthma symptoms and prevents asthma attacks. Flexhaler is a breath actuated inhaler that requires medication to be drawn from the device using force of one’s own breath.