Viagra is contraindicated in patients with a known hypersensitivity to any component of the tablet.
There was no effect on sperm motility or morphology after single 100 mg oral doses of Viagra in healthy volunteers.
For sildenafil, the following should be considered: Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to sildenafil.
The adverse events were generally transient and mild to moderate in nature.
Figure 3 shows that regardless of the baseline levels of function, subsequent function in patients treated with Viagra was better than that seen in patients treated with placebo.
If you miss a dose of Viagra and you still intend to engage in sexual activity, take it as soon as you remember.
There were two subjects who had a standing SBP of < 85 mmHg.
These treatments include pills, medicines that are injected or inserted into the penis, implants or vacuum pumps.
If you notice any other effects, check with your doctor.
7 seconds for sildenafil (N=70) and placebo, respectively.
If priapism is not treated immediately, penile tissue damage and permanent loss of potency may result.
It works by helping to increase blood flow into the penis during sexual stimulation.
If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25 mg dose and may limit you to a maximum single dose of 25 mg of Viagra in a 48 hour period.
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Percentage of Patients Reporting an Improvement in Erections.
Pharmacokinetics and Metabolism Viagra is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25–63%).
Counseling of patients about the protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), may be considered.
When vasodilators are used in combination, an additive effect on blood pressure may be anticipated.
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Diary data indicated that on Viagra, 59% of attempts at sexual intercourse were successful compared to 13% on placebo.
Viagra (50 mg) did not potentiate the hypotensive effect of alcohol in healthy volunteers with mean maximum blood alcohol levels of 0.
In vitro studies with human platelets indicate that sildenafil potentiates the antiaggregatory effect of sodium nitroprusside (a nitric oxide donor).
Symptoms of a heart attack may include chest, shoulder, neck, or jaw pain; numbness of an arm or leg; severe dizziness, headache, nausea, stomach pain, or vomiting; fainting; or vision changes.
Remember that Viagra offers no protection from transmission of sexually transmitted diseases, such as HIV, the virus that causes AIDS.
Warnings There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease.
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Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Viagra may also be used for other purposes not listed in this medication guide.
Sexual function data were also recorded by patients in a daily diary.
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5, 3, 4, 6 and 8 hours after Viagra or matching placebo.
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In a study of healthy male volunteers, co-administration of sildenafil at steady state (80 mg t.
Pharmacodynamics Effects of Viagra on Erectile Response In eight double-blind, placebo-controlled crossover studies of patients with either organic or psychogenic erectile dysfunction, sexual stimulation resulted in improved erections, as assessed by an objective measurement of hardness and duration of erections (RigiScan®), after Viagra administration compared with placebo.
5 hour before sexual activity.
Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse.
Presently, using them together is not recommended .
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Patients who experience symptoms (e.
In another study in healthy male volunteers, coadministration with the HIV protease inhibitor ritonavir, which is a highly potent P450 inhibitor, at steady state (500 mg bid) with Viagra (100 mg single dose) resulted in a 300% (4-fold) increase in sildenafil Cmax and a 1000% (11-fold) increase in sildenafil plasma AUC.
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If you have chest pains, dizziness or nausea during sex, stop having sex and immediately tell your doctor you have had this problem.
Most, but not all, of these men had heart problems before taking this medicine.
Less common side effects that may occur are temporary changes in color vision (such as trouble telling the difference between blue and green objects or having a blue color tinge to them), eyes being more sensitive to light, or blurred vision.
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If you experience a loss of vision in one or both eyes, stop using Viagra and seek medical attention immediately.
If you have questions about side effects, contact your health care provider.
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If you are taking a protease inhibitor, your dose may be adjusted (please see Finding the Right Dose for You).
Pregnancy—Sildenafil is not indicated for use in women.
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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.
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If you miss a dose of Viagra and you still intend to engage in sexual activity, take it as soon as you remember.
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This is called an erection.
In the third study, a single oral dose of Viagra 100 mg or matching placebo was administered in a 3-period crossover design to 20 generally healthy males with BPH.
However, Viagra may be taken anywhere from 4 hours to 0.
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Check with your health care provider before you start, stop, or change the dose of any medicine.
If you have chest pains, dizziness or nausea during sex, stop having sex and immediately tell your doctor you have had this problem.
Take Viagra only before sexual activity.
Use barrier methods of birth control (eg, condoms) if you have HIV infection or an STD.
Effects of Viagra on Cardiac Parameters Single oral doses of sildenafil up to 100 mg produced no clinically relevant changes in the ECGs of normal male volunteers.
Tell your doctor about any medicines you are taking.
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Subgroup analyses of responses to a global improvement question in patients with psychogenic etiology in two fixed-dose studies (total n=179) and two titration studies (total n=149) showed 84% of Viagra patients reported improvement in erections compared with 26% of placebo.
Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial hypertension and improve exercise capacity in men and women.
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If you are taking medicines called alpha-blockers for the treatment of high blood pressure or prostate problems, your blood pressure could suddenly drop.
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It is not possible to determine whether these reported events are related directly to the use of Viagra, to the patient’s underlying risk factors for hearing loss, a combination of these factors, or to other factors (see PRECAUTIONS, Information for Patients).
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Do not take Viagra if you are also using a nitrate drug for chest pain or heart problems, including nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro), isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket), or recreational drugs such as amyl nitrate or nitrite ("poppers").
These effects on the metabolite are not expected to be of clinical consequence.
Some of these side effects are more likely to occur with higher doses.
You and your doctor can determine the dose that works best for you.
This lower selectivity is thought to be the basis for abnormalities related to color vision observed with higher doses or plasma levels (see Pharmacodynamics).