1. a medicine that reduces congestion, especially in the nose and sinuses

1. having the effect of reducing congestion

Examples

• The doctor recommended a decongestant for my stuffy nose.
• She bought an over-the-counter decongestant at the pharmacy.
• The decongestant helped clear his blocked sinuses.
• Many cold medicines contain a decongestant ingredient.
• The decongestant spray provided immediate relief.
• He took a decongestant pill before going to bed.
• The decongestant properties of the medication worked quickly.