Although plasma levels of sildenafil at 24 hours post dose are much lower than at peak concentration, it is unknown whether nitrates can be safely coadministered at this time point.
It continues to work for up to 4 hours, although its action is usually less after 2 hours.
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In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and Viagra, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted (see Drug Interactions).
Of the four subjects who received Viagra 100 mg in the first part of this study, a severe adverse event related to blood pressure effect was reported in one patient (postural hypotension that began 35 minutes after dosing with Viagra with symptoms lasting for 8 hours), and mild adverse events potentially related to blood pressure effects were reported in two others (dizziness, headache and fatigue at 1 hour after dosing; and dizziness, lightheadedness and nausea at 4 hours after dosing).
It is not known if the medicine is safe for use in these patients Conditions causing thickened blood or slower blood flow, including leukemia; multiple myeloma (tumors of the bone marrow); or polycythemia, sickle cell disease, and thrombocythemia (blood problems) or Priapism (history of)—Although sildenafil does not cause priapism (erection lasting longer than 6 hours), patients with these conditions have an increased risk of priapism and it could occur while using sildenafil Heart or blood disease—Sexual activity increases the heart rate and blood flow and can increase the chance of problems occurring for some patients who use any type of medicine, including sildenafil, that increases sexual ability Kidney problems (severe) or Liver problems (severe)—Chance of problems occurring may be increased.
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Other medicines—Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur.
Do not use more of it and do not use it more often than your doctor ordered.
It is intended for use only by men who have a condition called erectile dysfunction.
The primary measure in the principal studies was a sexual function questionnaire (the International Index of Erectile Function - IIEF) administered during a 4-week treatment-free run-in period, at baseline, at follow-up visits, and at the end of double-blind, placebo-controlled, at-home treatment.
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Side Effects of This Medicine Along with its needed effects, a medicine may cause some unwanted effects.
There were four subjects with a decrease from baseline in standing systolic BP >30mmHg following Viagra 100 mg, one subject with a decrease from baseline in standing systolic BP > 30 mmHg following placebo and one subject with a decrease from baseline in standing systolic BP > 30 mmHg following both Viagra and placebo.
Single doses of antacid (magnesium hydroxide/aluminum hydroxide) did not affect the bioavailability of Viagra.
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Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise.
At doses above the recommended dose range, adverse events were similar to those detailed above but generally were reported more frequently.
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The major circulating metabolite results from N-desmethylation of sildenafil, and is itself further metabolized.
Others were reported to have occurred hours to days after the use of Viagra and sexual activity.
Talk with your doctor about the best way to take Viagra .
Special Senses: sudden decrease or loss of hearing, mydriasis, conjunctivitis, photophobia, tinnitus, eye pain, ear pain, eye hemorrhage, cataract, dry eyes.
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Physicians should advise patients to stop use of all PDE5 inhibitors, including Viagra, and seek medical attention in the event of a sudden loss of vision in one or both eyes.
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Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of sildenafil (200–800 mg).
The major circulating metabolite results from N-desmethylation of sildenafil, and is itself further metabolized.
This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket).
6 times the MRHD on a mg/m2 basis.
Take Viagra by mouth with or without food.
In these cases, your doctor may want to change the dose, or other precautions may be necessary.
The mean subject age was 66.
6 times the MRHD on a mg/m2 basis.
If you take Viagra with any nitrate medicine your blood pressure could suddenly drop to an unsafe or life threatening level.
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Urogenital: prolonged erection, priapism (see WARNINGS), and hematuria.
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The primary measure in the principal studies was a sexual function questionnaire (the International Index of Erectile Function - IIEF) administered during a 4-week treatment-free run-in period, at baseline, at follow-up visits, and at the end of double-blind, placebo-controlled, at-home treatment.
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Diary data in two of the studies (n=178) showed rates of successful intercourse per attempt of 70% for Viagra and 29% for placebo.
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Most, but not all, of these men had heart problems before taking this medicine.
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Protein binding is independent of total drug concentrations.
Heat or moisture may cause the medicine to break down.
However, check with your doctor if any of the following side effects continue or are bothersome: More common Aches or pains in muscles; bloody nose; diarrhea; difficult or labored breathing; flushing; headache; nasal congestion; pain or tenderness around eyes and cheekbones; redness of skin; sneezing; stomach discomfort following meals; stuffy or runny nose; trouble in sleeping; unusually warm skin Rare Anxiety Note: The following rare side effects have not been completely established as being caused by sildenafil Abdominal pain; abnormal dreams; clumsiness or unsteadiness; cough; diarrhea or stomach cramps (severe or continuing); difficulty in swallowing; ear pain; increased amount of saliva; increased skin sensitivity; lack of coordination; loss of bladder control; mental depression; nausea; numbness or tingling of hands, legs, or feet; rectal bleeding; redness or irritation of the tongue; redness, soreness, swelling, or bleeding of gums; ringing or buzzing in ears; sensation of motion, usually whirling, ei
When Viagra is co-administered with an alpha-blocker, patients should be stable on alpha-blocker therapy prior to initiating Viagra treatment and Viagra should be initiated at the lowest dose (see Drug Interactions).
This has occurred in a small number of people taking Viagra, most of whom also had heart disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoke or are over 50 years old.
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Treatment with doxazosin continued for at least 7 days after dose period 1.
If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
The adverse events were generally transient and mild to moderate in nature.
Take Viagra exactly as it was prescribed for you.
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Physicians should also discuss with patients the increased risk of NAION in individuals who have already experienced NAION in one eye, including whether such individuals could be adversely affected by use of vasodilators, such as PDE5 inhibitors (see POST-MARKETING EXPERIENCE/Special Senses).
In humans, Viagra has no effect on bleeding time when taken alone or with aspirin.
Dosing—The dose of sildenafil will be different for different patients.
Do not take more of Viagra than recommended or take it more often than once daily, or as directed by your doctor.
Viagra is a pill used to treat erectile dysfunction (impotence) in men.
Before taking Viagra, tell your doctor if you are allergic to any drugs, or if you have If you have any of these conditions, you may need a dose adjustment or special tests to safely take Viagra.
Before taking Viagra, tell your doctor if you are allergic to any drugs, or if you have If you have any of these conditions, you may need a dose adjustment or special tests to safely take Viagra.