The mean subject age in this study was 66.
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At the same time, on-treatment function was better in treated patients who were less impaired at baseline.
Do not take it in larger doses or for longer than recommended by your doctor.
However, Viagra may be taken anywhere from 4 hours to 0.
Carcinogenesis, Mutagenesis, Impairment of Fertility Sildenafil was not carcinogenic when administered to rats for 24 months at a dose resulting in total systemic drug exposure (AUCs) for unbound sildenafil and its major metabolite of 29- and 42-times, for male and female rats, respectively, the exposures observed in human males given the Maximum Recommended Human Dose (MRHD) of 100 mg.
Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.
7 seconds for sildenafil (N=70) and placebo, respectively.
The adverse events were generally transient and mild to moderate in nature.
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Such an event may be a sign of non-arteritic anterior ischemic optic neuropathy (NAION), a cause of decreased vision including permanent loss of vision, that has been reported rarely post-marketing in temporal association with the use of all PDE5 inhibitors.
This includes nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, and others), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket).
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However, Viagra may be taken anywhere from 4 hours to 0.
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Geriatric Use Healthy elderly volunteers (65 years or over) had a reduced clearance of sildenafil (see CLINICAL PHARMACOLOGY: Pharmacokinetics in Special Populations).
Keep Viagra in its original container.
Digestive: vomiting, glossitis, colitis, dysphagia, gastritis, gastroenteritis, esophagitis, stomatitis, dry mouth, liver function tests abnormal, rectal hemorrhage, gingivitis.
Be sure that any discarded medicine is out of the reach of children.
eatments that cause erections (eg, medicines injected or inserted into the penis, implants or vacuum pumps) Some MEDICINES MAY INTERACT with Viagra .
In addition, patients were asked a global efficacy question and an optional partner questionnaire was administered.
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Two of these subjects had a standing SBP < 85mmHg.
At 24 hours the plasma levels of sildenafil were still approximately 200 ng/mL, compared to approximately 5 ng/mL when sildenafil was dosed alone.
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Keep Viagra in its original container.
The concomitant administration of the protease inhibitor ritonavir substantially increases serum concentrations of sildenafil (11-fold increase in AUC).
Prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of Viagra.
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Some medical conditions may interact with Viagra .
After sex is over, the erection goes away.
When Viagra was taken as recommended (on an as-needed basis) in flexible-dose, placebo-controlled clinical trials, the following adverse events were reported: Other adverse reactions occurred at a rate of >2%, but equally common on placebo: respiratory tract infection, back pain, flu syndrome, and arthralgia.
Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems.
Lower starting doses may be used and doses increased as needed and as tolerated NAION (serious eye condition) in one or both eyes, previously—May increase your chance of getting NAION again.
If you have any questions about Viagra , please talk with your doctor, pharmacist, or other health care provider.
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Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence).
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).
Older adults—Elderly people are especially sensitive to the effects of sildenafil, which may increase their chance of having side effects.
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In trials of all designs, adverse events reported by patients receiving Viagra were generally similar.
Others were reported to have occurred hours to days after the use of Viagra and sexual activity.
Ask your doctor or pharmacist if you do not understand any of this information or if you want to know more about Viagra.
Viagra had no effect on ritonavir pharmacokinetics (see DOSAGE AND ADMINISTRATION).
If you take Viagra with any nitrate medicine or recreational drug containing nitrates, your blood pressure could suddenly drop to an unsafe level.
Also collected as part of the IIEF was information about other aspects of sexual function, including information on erectile function, orgasm, desire, satisfaction with intercourse, and overall sexual satisfaction.
These doses represent, respectively, about 20 and 40 times the MRHD on a mg/m2 basis in a 50 kg subject.
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 Viagra with caution.
If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Viagra should not be used with any other medical treatments that cause erections.
If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.
Viagra is not recommended for use in CHILDREN; safety and effectiveness in children have not been confirmed.
7 seconds for sildenafil (N=70) and placebo, respectively.
Do not take Viagra more than once per day.
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Depending on how and when the drug works for you, an interval of one-half hour to as much as 4 hours may prove ideal.
If you have chest pains, dizziness or nausea during sex, stop having sex and immediately tell your doctor you have had this problem.
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Its pharmacokinetics are dose-proportional over the recommended dose range.
PDE5 inhibitors, including Viagra, and alpha-adrenergic blocking agents are both vasodilators with blood pressure lowering effects.
The penis cannot fill with enough blood.
Before prescribing Viagra, it is important to note the following: Caution is advised when Phosphodiesterase Type 5 (PDE5) inhibitors are co-administered with alpha-blockers.
If you are not sure if any of your medicines contain nitrates, or if you do not understand what nitrates are, ask your doctor or pharmacist.
Since higher plasma levels may increase both the efficacy and incidence of adverse events, a starting dose of 25 mg should be considered (see DOSAGE AND ADMINISTRATION).
Although the interaction between other protease inhibitors and sildenafil has not been studied, their concomitant use is expected to increase sildenafil levels.
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Maximum observed plasma concentrations are reached within 30 to 120 minutes (median 60 minutes) of oral dosing in the fasted state.
Do not take it in larger doses or for longer than recommended by your doctor.
The effectiveness of Viagra was evaluated in most studies using several assessment instruments.
Sildenafil citrate is designated chemically as 1 - [[3 - (6,7 - dihydro - 1 - methyl - 7 - oxo - 3 - propyl - 1H - pyrazolo[4,3 - d]pyrimidin - 5 - yl) - 4 - ethoxyphenyl]sulfonyl] - 4 - methylpiperazine citrate and has the following structural formula: Sildenafil citrate is a white to off-white crystalline powder with a solubility of 3.
It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors (see ADVERSE REACTIONS, CLINICAL TRIALS and POST-MARKETING EXPERIENCE).
Patients who are taking this medicine for pulmonary arterial hypertension may also need to be started at a lower dose.
Depending on how and when the drug works for you, an interval of one-half hour to as much as 4 hours may prove ideal.
When Viagra 100 mg oral was coadministered with amlodipine, 5 mg or 10 mg oral, to hypertensive patients, the mean additional reduction on supine blood pressure was 8 mmHg systolic and 7 mmHg diastolic.
An evaluation of visual function at doses up to twice the maximum recommended dose revealed no effects of Viagra on visual acuity, intraocular pressure, or pupillometry.
Viagra demonstrated statistically significant improvement compared to placebo in all 21 studies.
Patients who have suffered a myocardial infarction, stroke, or life-threatening arrhythmia within the last 6 months; Patients with resting hypotension (BP <90/50) or hypertension (BP >170/110); Patients with cardiac failure or coronary artery disease causing unstable angina; Patients with retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases).
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Most, but not all, of these patients had underlying anatomic or vascular risk factors for developing NAION, including but not necessarily limited to: low cup to disc ratio ("crowded disc"), age over 50, diabetes, hypertension, coronary artery disease, hyperlipidemia and smoking.
Following a review of the data from these first 4 subjects (details provided below), the Viagra dose was reduced to 25 mg.
Effects of Viagra on Vision At single oral doses of 100 mg and 200 mg, transient dose-related impairment of color discrimination (blue/green) was detected using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels.
The inhibition of PDE5 in these tissues by sildenafil may be the basis for the enhanced platelet antiaggregatory activity of nitric oxide observed in vitro, an inhibition of platelet thrombus formation in vivo and peripheral arterial-venous dilatation in vivo.
For example: If you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose (25 mg) of Viagra.
Also collected as part of the IIEF was information about other aspects of sexual function, including information on erectile function, orgasm, desire, satisfaction with intercourse, and overall sexual satisfaction.
In vitro studies with human platelets indicate that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside (a nitric oxide donor).
Viagra is not for newborns, children, or women.
Patients who experience symptoms (e.
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Store away from heat, moisture, and light.
Two of the questions from the IIEF served as primary study endpoints; categorical responses were elicited to questions about (1) the ability to achieve erections sufficient for sexual intercourse and (2) the maintenance of erections after penetration.
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Why should Viagra not be prescribed?
The mean times (adjusted for baseline) to onset of limiting angina were 423.
Do not let anyone else take your Viagra.
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Patients who are taking this medicine for pulmonary arterial hypertension may also need to be started at a lower dose.
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The erectile response, as assessed by RigiScan®, generally increased with increasing sildenafil dose and plasma concentration.
In vivo studies Three double-blind, placebo-controlled, randomized, two-way crossover studies were conducted to assess the interaction of Viagra with doxazosin, an alpha-adrenergic blocking agent.
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.
Contact your doctor right away if you have an erection that lasts more than 4 hours.
If you have questions about side effects, contact your health care provider.