Modifies a noun

• spray: Scuba divers may be tempted to use decongestant sprays to prevent pain in their ears during the descent.

• drop: Buy some decongestant nose drops from your local pharmacy.

• medicine: Take Ken's £ 5 decongestant medicine and be glad today.

• effect: Decongestant effects clears headaches and good for lungs and respiratory ailments such as colds, and flu.