Who Should Not Use Generic Viagra?

Genericviagra treats erectile dysfunction in men. But all men can’t use this. In simply speaking, this drug is not suitable for all although they are experiencing the same impotence problem.

The following lines will give you knowledge where this drug is denied for use.

Viagra is prohibited in patients who have a known hypersensitivity to any component of the drug.

This drug contains systemic vasodilatory properties that cause temporary decreases in supine blood pressure in healthy patients. This usually do not cause serious problem in most patients. However before prescribing viagra, physicians should carefully assess whether vasodilatory effects can be unsafe for their patients with cardiovascular disease.

Viagra increases the adverse effects if used with nitrate drugs either regularly and/or intermittently, in any form (e.g. tablet, capsule, patch, ointment), or nitroprusside. Therefore its administration to patients is contraindicated who are taking nitrates.

When single 100 mg oral doses were given to healthy subjects, it caused 2 ng/mL plasma levels of sildenafil at 24 hours post dose (compared to peak plasma levels of around 440 ng/mL). In the following patients: age >65, hepatic impairment (e.g., cirrhosis), severe renal impairment (e.g., creatinine clearance <30 mL/min), and concomitant use of potent cytochrome P450 3A4 inhibitors (erythromycin), plasma levels of sildenafil at 24 hours post dose have been 3 to 8 times greater than those seen in healthy subjects.

Some medicines may cause adverse reaction if used with any PDE5 inhibitor including this drug. Hence this drug should not be used with the following drugs:

Bosentan or rifampin because they may decrease Viagra 's effectiveness, Alpha-blockers (e.g., doxazosin), medicines for high blood pressure, nitrates (e.g., isosorbide, nitroglycerin), or nitroprusside because severe low blood pressure with dizziness, lightheadedness, and fainting may occur, Azole antifungals (e.g., itraconazole, ketoconazole), H 2 antagonists (e.g., cimetidine), HIV protease inhibitors (e.g. ritonavir, saquinavir), macrolide antibiotics (e.g., erythromycin), narcotic analgesics (e.g., dihydrocodeine), or telithromycin because they may increase the risk of Viagra's side effects

Tell your health care provider if you are taking any of these.

Viagra should not be used in patients who have or had prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours in duration). Otherwise this drug would increase the incidence of this condition.

Patients who are denied to have sexual activity also should not make use of this drug.

Patients with the following underlying conditions can be especially sensitive to Viagra – those with left ventricular outflow obstruction (e.g. aortic stenosis, idiopathic hypertrophic subaortic stenosis) and those with severe impaired autonomic control of blood pressure.

There is no studies have been made on the safety of Viagra in the following groups; if prescribed, caution should be exercised: Patients with resting hypotension (BP <90/50) or hypertension (BP >170/110); cardiac failure or coronary artery disease causing unstable angina; retinitis pigmentosa (a minority of these patients have genetic disorders of retinal phosphodiesterases). Caution is required in patients who have suffered a myocardial infarction, stroke, or life-threatening arrhythmia within the last 6 months.