Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using 4-Way and call your doctor at once if you have:
severe sneezing, runny or stuffy nose, redness or swelling in your nose, or other worsening nasal symptoms (may be a sign of overuse of 4-Way);
severe stinging, burning, or irritation inside your nose;
severe dizziness, restless feeling, nervousness, or insomnia;
mood changes, unusual thoughts or behavior;
tremors or shaking; or
little or no urination.
Side effects may be more likely in older adults.
Common side effects may include:
temporary sneezing;
mild burning, dryness, cold feeling, or irritation inside your nose;
headache, dizziness, weakness;
feeling excited or restless (especially in children); or
mild sleep problems.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 4 Way Fast Acting Nasal Spray side effects (more detail)
