Asthma inhalers are hand-held devices that allow ... loading a specific amount of the drug in the medication chamber. You then simply wrap your lips around the mouthpiece and inhale forcefully.

Aim: (1) To compare the efficacy and adverse effects of treatment using nebulizers vs pressurized metered-dose inhalers (MDIs) with or without a spacer/holding chamber vs dry powder inhalers (DPIs ...

Some people have trouble using an inhaler properly and don't get the medicine where it needs to go. A spacer (a holding chamber between your inhaler and mouth) can help reduce these problems.