Never use this medication in larger doses or more often than is recommended. Too much oxymetazoline nasal could be very harmful.

If you experience any of the following serious side effects, stop using oxymetazoline nasal and seek emergency medical attention:

• an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives);

• seizures;

• unusual behavior or hallucinations; or

• an irregular or fast heartbeat.

More commonly, you may experience some sneezing or burning, stinging, dryness, or irritation of the nose. These side effects are usually mild and temporary.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.

Do not use oxymetazoline nasal if you have taken a monoamine oxidase (MAO) inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), or tranylcypromine (Parnate) in the last 14 days.

Although drug interactions between topical nasal decongestants and drugs taken by mouth are not expected, they can occur. Rarely, oxymetazoline nasal may interact with the following medicines:

• furazolidone (Furoxone);

• guanethidine (Ismelin);

• indomethacin (Indocin);

• methyldopa (Aldomet);

• bromocriptine (Parlodel);

• caffeine in cola, tea, coffee, chocolate and other products;

• theophylline (Theo-Dur, Theochron, Theolair, others);

• tricyclic antidepressants such as amitriptyline (Elavil, Endep), doxepin (Sinequan), and nortriptyline (Pamelor);

• other commonly used tricyclic antidepressants, including amoxapine (Asendin), clomipramine (Anafranil), desipramine (Norpramin), imipramine (Tofranil), protriptyline (Vivactil), and trimipramine (Surmontil);

• phenothiazines such as chlorpromazine (Thorazine), thioridazine (Mellaril), and prochlorperazine (Compazine); and

• other commonly used phenothiazines, including fluphenazine (Prolixin), perphenazine (Trilafon), mesoridazine (Serentil), and trifluoperazine (Stelazine).

Drugs other than those listed here may also interact with oxymetazoline nasal. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines.

Your pharmacist has additional information about oxymetazoline nasal written for health professionals that you may read.