Viagrex Tablet

Treatment of men with erectile dysfunction, which is the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. In order for Viagrex to be effective, sexual stimulation is required. Viagrex is also indicated in pulmonary arterial hypertension.

Viagrex is a selective, reversible inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). When sexual stimulation causes the local release of nitric oxide; inhibition of PDE5 by Viagrex produces increased levels of cGMP in the corpus cavernosum. This results in smooth muscle relaxation and inflow of blood into the penile tissues, thereby producing an erection. Viagrex has no effect in the absence of sexual stimulation.

Mechanism of Action: The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum, but enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by Sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.

Pharmacokinetics and Metabolism: Sildenafil is rapidly absorbed after oral administration, with a mean absolute bioavailability of 41% (range 25-63%). It is eliminated predominantly by hepatic metabolism (mainly cytochrome P450 3A4) and is converted to an active metabolite with properties similar to the parent, Sildenafil. Both Sildenafil and the metabolite have terminal half lives of about 4 hours.

Absorption and Distribution: Sildenafil is rapidly absorbed. Maximum observed plasma concentrations are reached within 30 to 120 minutes (median 60 minutes) of oral dosing in the fasted state. When Sildenafil is taken with a high fat meal, the rate of absorption is reduced.

Metabolism and Excretion: Sildenafil is cleared by hepatic microsomal isoenzymes. After either oral or intravenous administration, Sildenafil is excreted as metabolites predominantly in the feces (approximately 80% of administered oral dose) and to a lesser extent in the urine (approximately 13% of the administered oral dose).

Pharmacokinetics in Special Populations: Geriatrics: Healthy elderly volunteers (65 years or over) had a reduced clearance of Sildenafil, resulting in approximately 84% and 107% higher plasma AUC values of Sildenafil compared to those seen in healthy younger volunteers.

Erectile dysfunction: For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, Sildenafil may be taken anywhere from 4 hours to 0.5 hour before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day.

The following factors are associated with increased plasma levels of Sildenafil: age >65, hepatic impairment, severe renal impairment, and concomitant use of potent cytochrome P450 3A4 inhibitors (ketoconazole, itraconazole, erythromycin, saquinavir). Since higher plasma levels may increase both the efficacy and incidence of adverse events, a starting dose of 25 mg should be considered in these patients. Sildenafil was shown to potentiate the hypotensive effects of nitrates and its administration in patients who use nitric oxide donors or nitrates in any form is therefore contraindicated. When Sildenafil is co-administered with an alpha-blocker, patients should be stable on alphablocker therapy prior to initiating Sildenafil treatment and Sildenafil should be initiated at the lowest dose.

Pulmonary arterial hypertension: The recommended dose of sildenafil citrate is 20 mg three times a day and should be taken approximately 4-6 hours apart, with or without food.

Viagrex metabolism is principally mediated by the cytochrome P450 (CYP) isoforms 3A4 (major route) and 2C9 (minor route). Therefore, inhibitors of these isoenzymes 15 may reduce Viagrex clearance and inducers of these isoenzymes may increase Viagrex clearance. Cimetidine (800 mg), a nonspecific CYP inhibitor, caused a 56% increase in plasma Viagrex concentrations when coadministered with Viagrex (50 mg) to healthy volunteers. When a single 100 mg dose of Viagrex was administered with erythromycin, a specific CYP3A4 inhibitor, at steady state (500 mg bid for 5 days), there was a 182% increase in Viagrex systemic exposure (AUC). In addition, in a study performed in healthy male volunteers, co-administration of the HIV protease inhibitor saquinavir, also a CYP3A4 inhibitor, at steady state (1200 mg tid) with Viagrex (100 mg single dose) resulted in a 140% increase in Viagrex Cmax and a 210% increase in Viagrex AUC. Viagrex had no effect on saquinavir pharmacokinetics. Stronger CYP3A4 inhibitors such as ketoconazole or itraconazole would be expected to have still greater effects, and population data from patients in clinical trials did indicate a reduction in Viagrex clearance when it was coadministered with CYP3A4 inhibitors (such as ketoconazole, erythromycin, or cimetidine). 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 Viagrex (100 mg single dose) resulted in a 300% (4-fold) increase in Viagrex Cmax and a 1000% (11-fold) increase in Viagrex plasma AUC. At 24 hours the plasma levels of Viagrex were still approximately 200 ng/mL, compared to approximately 5 ng/mL when Viagrex was dosed alone. This is consistent with ritonavir's marked effects on a broad range of P450 substrates. Viagrex had no effect on ritonavir pharmacokinetics. Although the interaction between other protease inhibitors and Viagrex has not been studied, their concomitant use is expected to increase Viagrex levels. In a study of healthy male volunteers, co-administration of Viagrex at steady state (80 mg t.i.d.) with endothelin receptor antagonist bosentan (a moderate inducer of CYP3A4, CYP2C9 and possibly of cytochrome P450 2C19) at steady state (125 mg b.i.d.) resulted in a 63% decrease of Viagrex AUC and a 55% decrease in Viagrex Cmax. Concomitant administration of strong CYP3A4 inducers, such as rifampin, is expected to cause greater decreases in plasma levels of Viagrex. Single doses of antacid (magnesium hydroxide/aluminum hydroxide) did not affect the bioavailability of Viagrex. Pharmacokinetic data from patients in clinical trials showed no effect on Viagrex pharmacokinetics of CYP2C9 inhibitors (such as tolbutamide, warfarin), CYP2D6 inhibitors (such as selective serotonin reuptake inhibitors, tricyclic antidepressants), thiazide and related diuretics, ACE inhibitors, and calcium channel blockers. The AUC of the active metabolite, N-desmethyl Viagrex, was increased 62% by loop and potassium-sparing diuretics and 102% by 16 nonspecific beta-blockers. These effects on the metabolite are not expected to be of clinical consequence.

Sildenafil is contraindicated in patient with hypersensitivity to any component of this medication. Sildenafil potentiates the hypotensive effects of nitrates, so it is contraindicated in patients who are using organic nitrates, either regularly or intermittently.

Body as a whole: face edema, photosensitivity reaction, shock, asthenia, pain, chills, accidental fall, abdominal pain, allergic reaction, chest pain, accidental injury.

Cardiovascular: angina pectoris, AV block, migraine, syncope, tachycardia, palpitation,hypotension, postural hypotension, myocardial ischemia, cerebral thrombosis, cardiac arrest, heart failure, abnormal electrocardiogram, cardiomyopathy.

Digestive: vomiting, glossitis, colitis, dysphagia, gastritis, gastroenteritis, esophagitis, stomatitis, dry mouth, liver function tests abnormal, rectal hemorrhage, gingivitis.

Hemic and Lymphatic: anemia and leukopenia.

Metabolic and Nutritional: thirst, edema, gout, unstable diabetes, hyperglycemia, peripheral edema, hyperuricemia, hypoglycemic reaction, hypernatremia.

Musculoskeletal: arthritis, arthrosis, myalgia, tendon rupture, tenosynovitis, bone pain,myasthenia, synovitis.

Nervous: ataxia, hypertonia, neuralgia, neuropathy, paresthesia, tremor, vertigo, depression, insomnia, somnolence, abnormal dreams, reflexes decreased, hyperesthesia.

Respiratory: asthma, dyspnea, laryngitis, pharyngitis, sinusitis, bronchitis, sputum increased, cough increased.

Skin and Appendages: urticaria, herpes simplex, pruritus, sweating, skin ulcer, contact dermatitis, exfoliative dermatitis.

Special Senses: sudden decrease or loss of hearing, mydriasis, conjunctivitis, photophobia, tinnitus, eye pain, ear pain, eye hemorrhage, cataract, dry eyes.

Urogenital: cystitis, nocturia, urinary frequency, breast enlargement, urinary incontinence, abnormal ejaculation, genital edema and anorgasmia.

Cardiovascular and cerebrovascular: Serious cardiovascular, cerebrovascular, and vascular events, including myocardial infarction, sudden cardiac death, ventricular arrhythmia, cerebrovascular hemorrhage, transient ischemic attack, hypertension, subarachnoid and intracerebral hemorrhages, and pulmonary hemorrhage have been reported post-marketing in temporal association with the use of Viagrex. Most, but not all, of these patients had preexisting cardiovascular risk factors. Many of these events were reported to occur during or shortly after sexual activity, and a few were reported to occur shortly after the use of Viagrex without sexual activity. Others were reported to have occurred hours to days after the use of Viagrex and sexual activity. It is not possible to determine whether these events are related directly to Viagrex, to sexual activity, to the patient's underlying 23 cardiovascular disease, to a combination of these factors, or to other factors.

Nervous: seizure, seizure recurrence, anxiety, and transient global amnesia.

Urogenital: prolonged erection, priapism and hematuria.

Special Senses: diplopia, temporary vision loss/decreased vision, ocular redness or bloodshot appearance, ocular burning, ocular swelling/pressure, increased intraocular pressure, retinal vascular disease or bleeding, vitreous detachment/traction, paramacular edema and epistaxis.

Pregnancy category B. There are no adequate and well-controlled studies of Sildenafil in pregnant women. Sildenafil is not indicated for use by women. In animal study shows that Sildenafil has no evidence of teratogenicity or embryotoxicity.

General: The evaluation of erectile dysfunction should include a determination of potential underlying causes and the identification of appropriate treatment following a complete medical assessment.

Before prescribing Viagrex, it is important to note the following: Caution is advised when Phosphodiesterase Type 5 (PDE5) inhibitors are co-administered with alpha-blockers. PDE5 inhibitors, including Viagrex, and alpha-adrenergic blocking agents are both vasodilators with blood-pressure-lowering effects. When vasodilators are used in combination, an additive effect on blood pressure may be anticipated. In some patients, concomitant use of these two drug classes can lower blood pressure significantly leading to symptomatic hypotension (e.g. dizziness, lightheadedness, fainting).

Consideration should be given to the following:

• Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. Patients who demonstrate hemodynamic instability on alpha-blocker therapy alone are at increased risk of symptomatic hypotension with concomitant use of PDE5 inhibitors.
• In those patients who are stable on alpha-blocker therapy, PDE5 inhibitors should be initiated at the lowest dose.
• In those patients already taking an optimized dose of a PDE5 inhibitor, alpha-blocker therapy should be initiated at the lowest dose. A stepwise increase in alpha-blocker dose may be associated with further lowering of blood pressure when taking a PDE5 inhibitor.
• Safety of combined use of PDE5 inhibitors and alpha-blockers may be affected by other variables, including intravascular volume depletion and other anti-hypertensive drugs.
• Viagrex has systemic vasodilatory properties and may augment the blood pressure-lowering effect of other anti-hypertensive medications.
• Patients on multiple antihypertensive medications were included in the pivotal clinical trials for Viagrex. In a separate drug interaction study, when amlodipine, 5 mg or 10 mg, and Viagrex, 100 mg were orally administered concomitantly to hypertensive patients mean additional blood pressure reduction of 8 mmHg systolic and 7 mmHg diastolic were noted.
• The safety of Viagrex is unknown in patients with bleeding disorders and patients with active peptic ulceration.
• Viagrex should be used with caution in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis or Peyronie's disease), or in patients who have conditions which may predispose them to priapism (such as sickle cell anemia, multiple myeloma, or leukemia).
• The safety and efficacy of combinations of Viagrex with other treatments for erectile dysfunction have not been studied. Therefore, the use of such combinations is not recommended.

There is a potential for cardiac risk of sexual activity in patients with preexisting cardiovascular disease. Therefore, treatments for erectile dysfunction, including Viagrex, should not be generally used in men for whom sexual activity is inadvisable because of their underlying cardiovascular status. Viagrex has systemic vasodilatory properties that resulted in transient decreases in supine blood pressure in healthy volunteers (mean maximum decrease of 8.4/5.5 mmHg). While this normally would be expected to be of little consequence in most patients, prior to prescribing Viagrex, physicians should carefully consider whether their patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects, especially in combination with sexual activity.

Patients with the following underlying conditions can be particularly sensitive to the actions of vasodilators including Viagrex - those with left ventricular outflow obstruction (e.g. aortic stenosis, idiopathic hypertrophic subaortic stenosis) and those with severely impaired autonomic control of blood pressure.
There is no controlled clinical data on the safety or efficacy of Viagrex in the following groups; if prescribed, this should be done with caution.

• 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);
• Patients with sickle cell or related anemias.

Prolonged erection greater than 4 hours and priapism (painful erections greater than 6 hours in duration) have been reported infrequently since market approval of Viagrex. In the event of an erection that persists longer than 4 hours, the patient should seek immediate medical assistance. If priapism is not treated immediately, penile tissue damage and permanent loss of potency could result. If Viagrex is prescribed to patients taking ritonavir, caution should be used. Data from subjects exposed to high systemic levels of Viagrex are limited. Visual disturbances occurred more commonly at higher levels of Viagrex exposure. Decreased blood pressure, syncope, and prolonged erection were reported in some healthy volunteers exposed to high doses of Viagrex (200-800 mg). To decrease the chance of adverse events in patients taking ritonavir, a decrease in Viagrex dosage is recommended.

In studies with healthy volunteers of single doses up to 800 mg, adverse events were similar to those seen at lower doses but incidence rates and severities were increased. 24 In cases of overdose, standard supportive measures should be adopted as required. Renal dialysis is not expected to accelerate clearance as Viagrex is highly bound to plasma proteins and it is not eliminated in the urine.

Drugs for Erectile Dysfunction

Keep in a dry place, away from light and heat. Keep out of the reach of children.