VIAGRA DRUG INTERACTIONS

Viagra drug interactions can change how your body metabolizes the medicines and cause changes in blood pressure, among other things. Some of the drugs that can potentially interact with Viagra include cimetidine, ritonavir, and alpha blockers. To reduce your risk of drug interactions with Viagra, it is important to talk with your doctor about any drug interactions that may apply to you.

This drug should not be used with the following medications because very serious (possibly fatal) interactions may occur:

• nitrates (e.g., nitroglycerin, isosorbide). If you are taking nitrates, you should not use Viagra. If you are presently using any medications, tell your doctor or pharmacist before starting sildenafil. It is crucial that you tell your doctor or pharmacist about all prescription and nonprescription products you use, especially other medications for impotence. In addition, tell your health care provider if you are a frequent user of caffeinated or alcoholic products.
• nitroprusside (or any "nitric oxide donor" drugs)
• recreational drugs called "poppers" containing amyl or butyl nitrite

If you are currently using any of these medications, tell your doctor or pharmacist before starting sildenafil.

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of:

• alpha-blocker medication (e.g., doxazosin, prazosin, terazosin). In experimental studies, when Alpha blockers and Viagra were used concurrently (especially in people with benign prostatic hyperplasia), blood pressure decreased. A few individuals experienced light-headedness, dizziness or fainting while standing, sitting or lying down. Taking a Viagra dosage above the limit of 25 mg within four hours of taking an Alpha blocker is not advisable.
• other medications for impotence
• bosentan
• high blood pressure medicines
• drugs affecting liver enzymes that remove sildenafil from your body (such as azole antifungals including ketoconazole/itraconazole, macrolide antibiotics including erythromycin, cimetidine, delavirdine, rifamycins including rifabutin/rifampin, St. John's wort, certain anti-seizure medicines including carbamazepine)

If you are taking an HIV protease inhibitor (e.g., ritonavir, saquinavir), do not take more than a 25 milligrams dose of sildenafil in a 48 hour period.

If you are taking more than a 25 milligrams dose of sildenafil and are also taking an alpha-blocker medication (e.g., doxazosin, prazosin, terazosin) for various conditions (e.g., enlarged prostate), separate the time between taking these medications by more than 4 hours.

Interactions with Food/Tobacco/Alcohol

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Using sildenafil with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use sildenafil, or give you special instructions about the use of food, alcohol, or tobacco.

This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

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