Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Viagra (Sildenafil).

Alcohol: Consumption of alcohol in large amounts may decrease the ability to get an erection and may also temporarily decrease blood pressure, causing dizziness and fainting.

Blood pressure: Tell your doctor if you are taking medications to treat high blood pressure. The combination of these medications and Viagra (Sildenafil) may add to the blood pressure-lowering effect of these medications. You should also let your doctor know if you have or have had low blood pressure.

Grapefruit juice: Grapefruit juice can increase the amount of Viagra (Sildenafil) in your bloodstream. Do not drink grapefruit juice when taking Viagra (Sildenafil).

Hearing problems: If you experience a sudden decrease or loss of hearing you should seek medical attention immediately.

Heart conditions: If you have or have had heart disease or a heart attack or stroke, you should speak to your doctor before taking any medication for erectile dysfunction. If chest pains, dizziness, or nausea are experienced during sex, the exertion should be stopped and your doctor informed.

Kidney problems: If you have poor kidney function you may need lower doses of Viagra (Sildenafil). Kidney Disease or reduced kidney function may cause Viagra (Sildenafil) to build up in the body, causing side effects. If you have kidney problems, discuss with your doctor how Viagra (Sildenafil) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Viagra (Sildenafil), and whether any special monitoring is needed.

Liver function: If you have poor liver function you may need lower doses of Viagra (Sildenafil). Liver disease or reduced liver function may cause Viagra (Sildenafil) to build up in the body, causing side effects. If you have liver problems, discuss with your doctor how Viagra (Sildenafil) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Viagra (Sildenafil), and whether any special monitoring is needed.

Nitrate-containing medications: Viagra (Sildenafil) should never be taken with any medications that contain nitrates. Blood pressure may suddenly drop to life-threatening levels if Viagra (Sildenafil) is taken with any nitrate-containing medication (e.g., nitroglycerin tablets, spray, or patches) or any other nitrates (e.g., isosorbide dinitrate or amyl nitrite "poppers"). Dizziness, fainting spells, heart attack, or stroke may be experienced.

If use of a nitrate-containing medication is considered medically necessary, you must wait 48 hours after the last dose of Viagra (Sildenafil) before taking a nitrate, and only under close medical supervision.

Penis deformation: As with other medications for erectile dysfunction, men with an anatomical deformation of the penis such as angulation, cavernosal fibrosis, or Peyronie's disease should be closely monitored by their doctors if they take this medication.

Prolonged erection: If an erection lasts longer than 4 hours (a rare occurrence), seek immediate medical assistance. If this condition is not treated quickly, tissue damage and permanent loss of the ability to have an erection could result.

Prostate problems: Tell your doctor if you are taking medications, such as alpha-blockers (e.g., Doxazosin), to treat prostate problems, as the combination of these medications with Viagra (Sildenafil) may add to the blood pressure-lowering effect of these medications.

Sexually transmitted infections: Viagra (Sildenafil) does not protect against sexually transmitted infections such as HIV.

Vision problems/eye conditions: If you experience a sudden loss of vision in one or both eyes or other vision related problems, contact your doctor immediately. Vision loss may be partial or complete. While in some cases the condition may improve over time, it can also be permanent.

This rare condition is more likely to occur if you have heart disease, high blood pressure, High Cholesterol, Diabetes, or eye problems, are more than 50 years old, or if you smoke. If you have any eye conditions, such as retinitis pigmentosa or non-arteritic anterior ischemic optic Neuropathy (NAION), tell your doctor.

Pregnancy and breast-feeding: Viagra (Sildenafil) is not intended for use by women.

Children: Viagra (Sildenafil) is not intended for use by children or adolescents under 18 years of age.

Seniors: If you are 65 years of age or older, you may need a lower dose of Viagra (Sildenafil).

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Levitra (Vardenafil).

Alcohol: Consumption of alcohol in large amounts may decrease the ability to get an erection and may also temporarily decrease blood pressure, causing dizziness and fainting.

Blood pressure: Tell your doctor if you are taking medications to treat high blood pressure, as the combination of these medications with Levitra (Vardenafil) may add to the blood-pressure-lowering effect of these medications. If you have Low Blood Pressure, discuss with your doctor how Levitra (Vardenafil) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Levitra (Vardenafil), and whether any special monitoring is needed.

Grapefruit juice: Grapefruit juice can increase the amount of Levitra (Vardenafil) in your bloodstream. Do not drink grapefruit juice when taking Levitra (Vardenafil).

Hearing problems: If you experience a sudden decrease or loss of hearing you should seek medical attention immediately.

Heart conditions: Men who have or have had heart disease or a heart attack or stroke should speak to their doctor before taking any medication for erectile dysfunction. If chest pains, dizziness, or nausea are experienced during sex, the exertion should be stopped and your doctor informed.

Liver function: Liver disease or reduced liver function may cause Levitra (Vardenafil) to build up in the body, causing side effects. If you have liver problems, discuss with your doctor how Levitra (Vardenafil) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Levitra (Vardenafil), and whether any special monitoring is needed. Lower doses of Levitra (Vardenafil) may be necessary.

Nitrate-containing medications: Levitra (Vardenafil) should never be taken with any medications that contain nitrates. Blood pressure may drop to life-threatening levels if Levitra (Vardenafil) is taken with any nitrate-containing medication (e.g., nitroglycerin tablets, spray, or patches) or any other nitrates (e.g., isosorbide dinitrate or amyl nitrite "poppers").

Dizziness, fainting spells, heart attack, or stroke may be experienced. If use of a nitrate-containing medication is considered medically necessary, a nitrate may only be taken at least 24 hours after the last dose of Levitra (Vardenafil), and only under close medical supervision.

Penis deformation: As with other medications for erectile dysfunction, if you have an anatomical deformation of the penis such as angulation, cavernosal fibrosis, or Peyronie's disease, you should be closely monitored by your doctors if you take Levitra (Vardenafil).

Prolonged erection: If an erection lasts longer than 4 hours (a rare occurrence), seek immediate medical assistance. If this condition is not treated quickly, tissue damage and permanent loss of the ability to have an erection could result. Tell your doctor if you have any of the following conditions as they may increase your risk of a prolonged erection: sickle cell Anemia, Multiple Myeloma, or Leukemia.

Prostate problems: Tell your doctor if you are taking medications such as alpha blockers (e.g., Doxazosin) to treat prostate problems, as the combination of these medications with Levitra (Vardenafil) may add to the blood pressure-lowering effect of these medications.

Sexually transmitted infections: Levitra (Vardenafil) does not protect against sexually transmitted infections such as HIV.

Vision problems/eye conditions: If you experience a sudden loss of vision in one or both eyes or other vision-related problems, contact your doctor immediately. Vision loss may be partial or complete. While in some cases the condition may improve over time, the loss can also be permanent.

This rare condition is more likely to occur if you have heart disease, high blood pressure, High Cholesterol, Diabetes, or eye problems, or are over 50 years old or smoke. Levitra (Vardenafil) should not be used by anyone with non-arteritic anterior ischemic optic neuropathy (NAION) or retinosa pigmentosa.

Pregnancy and breast-feeding: Levitra (Vardenafil) is not intended for use by women.

Children: Levitra (Vardenafil) is not intended for use by children or adolescents under 18 years of age.

Seniors: People over the age of 65 years may require lower doses of Levitra (Vardenafil).