Before Using This medicine: If you have heart problems severe enough to make sexual activity a danger, you should avoid using Levitra. Use it cautiously, if at all, if you've had a heart attack, stroke, or life-threatening heart irregularities within the past 6 months. Be equally cautious if you have severe high or low blood pressure, heart failure, or unstable angina (crushing heart pain that occurs at any time). If you take Levitra and develop cardiac symptoms (for example, dizziness, nausea, and chest pain) during sexual activity, do not continue. Alert your doctor to the problem as soon as possible. If you have a condition that might result in long-lasting erections, such as sickle cell anemia, multiple myeloma (a disease of the bone marrow), or leukemia, use Levitra with caution. Also use cautiously if you have a genital problem or deformity such as Peyronie''s disease. If an erection lasts more than 4 hours, seek treatment immediately. Permanent damage and impotence could result. If you have a bleeding disorder, a stomach ulcer, or the inherited eye condition known as retinitis pigmentosa, use this medication with caution. Its safety under these circumstances has not yet been studied. Remember that Levitra offers no protection from transmission of sexually transmitted diseases, such as HIV, the virus that causes AIDS.

Other Medical Problems: Levitra relaxes muscles within the penis. This allows increased blood flow into the penis which is necessary to achieve and maintain an erection. Levitra is used to treat erectile dysfunction (impotence). This drug is not for use by women. Its effects during pregnancy have not been studied.

Proper Use of This Medicine: Take 1/2 to 1 tablet 30-60 minutes prior to sexual activity not to exceed 20 mg in 48 hrs.

Precautions While Using This Medicine: Tell your online doctor of all nonprescription and prescription medication you may use, especially any nitrate medications (e.g., nitroglycerin, isosorbide dinitrate), nitroprusside (any "nitric oxide donor" medicines), cimetidine, erythromycin, azole antifungals (e.g., itraconazole, ketoconazole), mibefradil, rifamycins (e.g., rifampin) or high blood pressure medicines.
Side Effects of This Medicine: As with most prescription medications, taking Levitra may produce side effects. The most commonly reported side effects of Levitra were headache, flushing, dyspepsia (indigestion), and nasal congestion.