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Viagra does not work as well as it would otherwise if you eat a high-fat meal around the time you take it. Viagra should be taken on an empty stomach. Levitra may be slightly less effective if you eat a high-fat meal, but a moderate-fat meal does not reduce its effectiveness. Cialis works without regard to what you eat. taking viagra Levitra significantly improved the overall per-patient rate of achieving an erection sufficient for penetration (SEP2) (61% on 10 mg and 64% on 20 mg Levitra compared to 36% on placebo; p <0.0001).

Slideshow: Counterfeit Drugs: One Million Reasons Why it's Essential to Get Yours Legitimately If you get an angina attack do not take nitrate medicines to relieve the pain but tell your doctor immediately. Make sure your doctor knows you are taking Viagra.

Metabolism and Excretion: Sildenafil is cleared predominantly by the CYP3A4 (major route) and CYP2C9 (minor route) hepatic microsomal isoenzymes. The major circulating metabolite results from N-desmethylation of sildenafil, and is itself further metabolized. This metabolite has a PDE selectivity profile similar to sildenafil and an in vitro potency for PDE5 approximately 50% of the parent drug. Plasma concentrations of this metabolite are approximately 40% of those seen for sildenafil, so that the metabolite accounts for about 20% of sildenafil's pharmacologic effects. online prescription viagra Men who have had a heart attack or stroke within the past 6 months and those with certain medical conditions (e.g., uncontrolled high blood pressure, severe low blood pressure or liver disease, unstable angina) that make sexual activity inadvisable should not take Cialis. Dosages of the drug should be limited in patients with kidney or liver disorders.Inactive Ingredients

Sildenafil may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away: pfizer viagra online Renal Impairment

ED is a condition where the penis does not fill with enough blood to harden and expand when a man is sexually excited, or when he cannot keep an erection. A man who has trouble getting or keeping an erection should see his healthcare provider for help if the condition bothers him. Cialis helps increase blood flow to the penis and may help men with ED get and keep an erection satisfactory for sexual activity. Once a man has completed sexual activity, blood flow to his penis decreases, and his erection goes away.

Product Information tadalafil canada Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

From Ashton Kutcher to Rob Kardashian, take a look at five more dudes who have experimented with the drug.

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