Help prevent allergies with AllerBlock Adult Powder Nasal Spray. Created with an all-natural formula, this allergy spray helps to stop allergies before they start with a clinically proven formula. This allergy nose spray provides allergy relief to help with your symptoms by forming an invisible barrier that traps airborne allergens. Looking for nasal congestion relief without having to rely on a medicated sinus treatment? Stop allergies before they start with non-drowsy, naturally derived AllerBlock nasal mist. Non-drowsy allergy relief with no drugs makes this nasal mist safe to use anytime. Each bottle of allergy nasal spray contains up to 200 sprays.