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Tell your doctor about all other medications you use, especially:

• blood pressure medication or diuretics (water pills);

• cold or allergy medicines, diet pills, or over-the-counter pain medicine such as ibuprofen (Advil, Motrin) or naproxen (Aleve);

• an erectile dysfunction medication such as sildenafil (Viagra), tadalafil (Cialis), or vardenafil (Levitra);

• migraine headache medication such as ergotamine (Ergomar, Cafergot), or dihydroergotamine (D.H.E. 45, Migranal Nasal Spray);

• a beta-blocker such as atenolol (Tenormin), carvedilol (Coreg), metoprolol (Lopressor, Toprol), nadolol (Corgard), propranolol (Inderal), and others; or

• a calcium channel blocker such as amlodipine (Norvasc), diltiazem (Tiazac, Cartia, Cardizem), felodipine (Plendil), nicardipine (Cardene), nifedipine (Procardia, Adalat), nimodipine (Nimotop), nisoldipine (Sular), or verapamil (Calan, Covera, Isoptin, Verelan).

This list is not complete and there may be other drugs that can interact with nitroglycerin topical. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

• worsening chest pain, slow heart rate;

• feeling like you might pass out;

• chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;

• fast or pounding heartbeats; or

• blurred vision and dry mouth.

Less serious side effects may include:

• mild skin rash or itching;

• warmth, redness, or tingly feeling under your skin;

• nausea, vomiting, upset stomach; or

• feeling nervous, weak, or dizzy.

This is not a complete list of side effects and others than may occur. Tell your doctor about any unusual or bothersome side effect.