Asthma inhalers are often deployed improperly, resulting in as little as 7 percent (!) of the drugs making it to the lungs, per a new study.

And that's not the only medication that's being misused on the regular. But deep breath: You can get the most from your meds by avoiding a few key mistakes.

INHALER

The error: Not following directions to shake it before use, inhaling too early or late, or exhaling right away

The fix: Shake before every puff when required; breathe in and press the button simultaneously; hold your breath for 10 seconds after so the meds can reach the lungs.

EYE DROPS

The error: Letting them fall into the inner corner of the eye, which is a passageway to your nose and mouth (you'll know if you get a stuffy nose or a strange taste in your throat)

The fix: Use a finger to block that corner, and aim the drops for the center of your eye. Close your eye for 30 seconds.

NASAL SPRAY

The error: Not blowing your nose before--any existing mucus buildup will prevent it from working properly

The fix: Blow both sides of your nose, even if you don't feel congested. Then hold one nostril closed while you inhale the spray on one side. Switch sides.