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The evaluation of erectile dysfunction should include a medical assessment, a determination of potential underlying causes and the identification of appropriate treatment.
Before prescribing STAXYN, it is important to note the following:
Physicians should consider the cardiovascular status of their patients, since there is a degree of cardiac risk associated with sexual activity. Therefore, treatment for erectile dysfunction, including STAXYN, should not be used in men for whom sexual activity is not recommended because of their underlying cardiovascular status.
There are no controlled clinical data on the safety or efficacy of vardenafil in the following patients; and therefore its use is not recommended until further information is available: unstable angina; hypotension (resting systolic blood pressure of < 90 mmHg); uncontrolled hypertension ( > 170/110 mmHg); recent history of stroke, life-threatening arrhythmia, or myocardial infarction (within the last 6 months); severe cardiac failure.
Left Ventricular Outflow Obstruction
Patients with left ventricular outflow obstruction (for example, aortic stenosis and idiopathic hypertrophic subaortic stenosis) can be sensitive to the action of vasodilators including PDE5 inhibitors.
Blood Pressure Effects
Vardenafil has systemic vasodilatory properties that resulted in transient decreases in supine blood pressure in healthy volunteers (mean maximum decrease of 7 mmHg systolic and 8 mmHg diastolic) [see CLINICAL PHARMACOLOGY]. While this normally would be expected to be of little consequence in most patients, prior to prescribing STAXYN, physicians should carefully consider whether their patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects.
Potential For Drug Interactions With Potent or Moderate CYP3A4 Inhibitors
Concomitant administration with potent CYP3A4 inhibitors (such as ritonavir, indinavir, ketoconazole) or moderate CYP3A4 inhibitors (such as erythromycin) increases plasma concentrations of vardenafil. Do not use STAXYN in patients taking potent or moderate CYP3A4 inhibitors. [See DOSAGE AND ADMINISTRATION, DRUG INTERACTIONS and PATIENT INFORMATION]
Risk Of Priapism
There have been rare reports of prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) for this class of compounds, including vardenafil. In the event that an erection 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 may result.
STAXYN should be used with caution by patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis, or Peyronie's disease) or by patients who have conditions that may predispose them to priapism (such as sickle cell anemia, multiple myeloma, or leukemia).
Effects On The Eye
Physicians should advise patients to stop use of all phosphodiesterase type 5 (PDE5) inhibitors, including STAXYN, and seek medical attention in the event of sudden loss of vision in one or both eyes. Such an event may be a sign of nonarteritic anterior ischemic optic neuropathy (NAION), a rare condition and a cause of decreased vision, including permanent loss of vision, that has been reported rarely postmarketing in temporal association with the use of all PDE5 inhibitors. Based on published literature, the annual incidence of NAION is 2.5–11.8 cases per 100,000 in males aged ≥ 50. An observational study evaluated whether recent use of PDE5 inhibitors, as a class, was associated with acute onset of NAION. The results suggest an approximate 2 fold increase in the risk of NAION within 5 half-lives of PDE5 inhibitor use. From this information, 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].
Physicians should consider whether their patients with underlying NAION risk factors could be adversely affected by use of PDE5 inhibitors. Individuals who have already experienced NAION are at increased risk of NAION recurrence. Therefore, PDE5 inhibitors, including Staxyn, should be used with caution in these patients and only when the anticipated benefits outweigh the risks. Individuals with “crowded” optic disc are also considered at greater risk for NAION compared to the general population, however, evidence is insufficient to support screening of prospective users of PDE5 inhibitors, including STAXYN, for this uncommon condition.
STAXYN has not been evaluated in patients with known hereditary degenerative retinal disorders, including retinitis pigmentosa, therefore its use is not recommended until further information is available in those patients.
Sudden Hearing Loss
Physicians should advise patients to stop taking all PDE5 inhibitors, including STAXYN, and seek prompt medical attention in the event of sudden decrease or loss of hearing. These events, which may be accompanied by tinnitus and dizziness, have been reported in temporal association to the intake of PDE5 inhibitors, including vardenafil. 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].
In patients taking alpha-blockers, do not initiate vardenafil therapy with STAXYN. Patients treated with alpha-blockers who have previously used vardenafil film-coated tablets may be changed to STAXYN at the advice of their healthcare provider. Caution is advised when PDE5 inhibitors are co-administered with alpha-blockers. PDE5 inhibitors, including STAXYN, 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 [see DRUG INTERACTIONS and CLINICAL PHARMACOLOGY] leading to symptomatic hypotension (for example, 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 recommended starting dose. In patients taking alpha-blockers, do not initiate vardenafil therapy with STAXYN. Lower doses of vardenafil film-coated tablets should be used as initial therapy in these patients [see DOSAGE AND ADMINISTRATION].
- In those patients already taking an optimized dose of PDE5 inhibitor, alpha-blocker therapy should be initiated at the lowest dose. Stepwise increases in alpha-blocker dose may be associated with further lowering of blood pressure in patients 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.
Congenital Or Acquired QT Prolongation
In a study of the effect of vardenafil on QT interval in 59 healthy males [see CLINICAL PHARMACOLOGY], therapeutic (10 mg film-coated tablets) and supratherapeutic (80 mg) doses of vardenafil and the active control moxifloxacin (400 mg) produced similar increases in QTc interval. A postmarketing study evaluating the effect of combining vardenafil with another drug of comparable QT effect showed an additive QT effect when compared with either drug alone [see CLINICAL PHARMACOLOGY]. These observations should be considered in clinical decisions when prescribing vardenafil to patients with known history of QT prolongation or patients who are taking medications known to prolong the QT interval.
Patients taking Class 1A (for example, quinidine, procainamide) or Class III (for example, amiodarone, sotalol) antiarrhythmic medications or those with congenital QT prolongation, should avoid using STAXYN.
Do not use STAXYN in patients on renal dialysis, as vardenafil has not been evaluated in this population [see DOSAGE AND ADMINISTRATION and Use In Specific Populations].
Combination With Other Erectile Dysfunction Therapies
The safety and efficacy of STAXYN used in combination with other treatments for erectile dysfunction have not been studied. Therefore, the use of such combinations is not recommended.
Effects On Bleeding
In humans, vardenafil film-coated tablet alone in doses up to 20 mg does not prolong the bleeding time. There is no clinical evidence of any additive prolongation of the bleeding time when vardenafil is administered with aspirin. STAXYN has not been administered to patients with bleeding disorders or significant active peptic ulceration. Therefore STAXYN should be administered to these patients after careful benefit-risk assessment.
STAXYN contains sorbitol. Patients with rare hereditary problems of fructose intolerance should not take STAXYN.
Sexually Transmitted Disease
The use of STAXYN offers no protection against sexually transmitted diseases. Counseling of patients about protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), should be considered.
Patient Counseling Information
See FDA-approved patient labeling (PATIENT INFORMATION)
Use with Other Formulations of Vardenafil
Inform patients that STAXYN is not interchangeable with vardenafil film-coated tablets (LEVITRA) as it provides higher systemic exposure. They should also discuss that the maximum dosage is one STAXYN tablet per 24 hours.
Discuss with patients that STAXYN is contraindicated with regular and/or intermittent use of organic nitrates. Patients should be counseled that concomitant use of vardenafil with nitrates could cause blood pressure to suddenly drop to an unsafe level, resulting in dizziness, syncope, or even heart attack or stroke.
Guanylate Cyclase (GC) Stimulators
Inform patients that Staxyn is contraindicated in patients who use guanylate cyclase stimulators, such as riociguat.
Discuss with patients the potential cardiac risk of sexual activity for patients with preexisting cardiovascular risk factors.
Concomitant Use with Drugs which Lower Blood Pressure
Inform patients that in some patients concomitant use of PDE5 inhibitors, including STAXYN, with alpha-blockers can lower blood pressure significantly leading to symptomatic hypotension (for example, fainting). Patients who are taking alpha-blockers should only use STAXYN when previous treatment with vardenafil film-coated tablets has been well tolerated [see DOSAGE AND ADMINISTRATION and DRUG INTERACTIONS]. Patients should be advised of the possible occurrence of symptoms related to postural hypotension and appropriate countermeasures. Patients should be advised to contact the prescribing physician if other anti-hypertensive drugs or new medications that may interact with STAXYN are prescribed by another healthcare provider.
Discuss with patients the appropriate use of STAXYN and its anticipated benefits. It should be explained that sexual stimulation is required for an erection to occur after taking STAXYN. STAXYN should be taken approximately 60 minutes before sexual activity. Patients should be counseled regarding the dosing of STAXYN, especially regarding the maximum daily dose. Patients should be advised to contact their healthcare provider if they are not satisfied with the quality of their sexual performance with STAXYN or in the case of an unwanted effect.
Inform patients that there have been rare reports of prolonged erections greater than 4 hours and priapism (painful erections greater than 6 hours in duration) for vardenafil and this class of compounds. In the event that an erection 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 may result.
Advise patients to contact the prescribing physician if new medications that may interact with STAXYN are prescribed by another healthcare provider.
Sudden Loss of Vision
Inform patients to stop use of all PDE5 inhibitors, including STAXYN, and seek medical attention in the event of sudden loss of vision in one or both eyes. 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 postmarketing in temporal association with the use of all PDE5 inhibitors. It is not possible to determine whether these events were related directly to the use of PDE5 inhibitors or to other factors. Physicians should also discuss with patients the increased risk of NAION in individuals who have already experienced NAION in one eye. Physicians should also discuss with patients the increased risk of NAION among the general population in patients with a “crowded” optic disc, although evidence is insufficient to support screening of prospective users of PDE5 inhibitor, including Staxyn, for this uncommon condition [see WARNINGS AND PRECAUTIONS and see ADVERSE REACTIONS].
Sudden Hearing Loss
Advise patients to stop taking PDE5 inhibitors, including STAXYN, and seek prompt medical attention in the event of sudden decrease or loss of hearing. These events, which may be accompanied by tinnitus and dizziness, have been reported in temporal association to the intake of PDE5 inhibitors, including STAXYN. 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].
Sexually Transmitted Disease
Inform Patients that STAXYN offers no protection against sexually transmitted diseases. Counsel patients that protective measures necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), should be considered.
STAXYN is available only in a single strength. Patients who require a different dosage should be prescribed vardenafil film-coated tablets (LEVITRA).
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Vardenafil was not carcinogenic in rats and mice when administered daily for 24 months. In these studies systemic drug exposures (AUCs) for unbound (free) vardenafil and its major metabolite were approximately 400-and 170-fold for male and female rats, respectively, and 21-and 37-fold for male and female mice, respectively, the exposures observed in human males given the maximum recommended human dose (MRHD) of 20 mg.
Vardenafil was not mutagenic as assessed in either the in vitro bacterial Ames assay or the forward mutation assay in Chinese hamster V79 cells. Vardenafil was not clastogenic as assessed in either the in vitro chromosomal aberration test or the in vivo mouse micronucleus test.
Impairment of Fertility
Vardenafil did not impair fertility in male and female rats administered doses up to 100 mg/kg/day for 28 days prior to mating in males, and for 14 days prior to mating and through day 7 of gestation in females. In a corresponding 1-month rat toxicity study, this dose produced an AUC value for unbound vardenafil 200 fold greater than AUC in humans at the MRHD of 20 mg.
Use In Specific Populations
Pregnancy Category B: STAXYN is not indicated for use in women. There are no studies of STAXYN use in pregnant women.
No evidence of specific potential for teratogenicity, embryotoxicity or fetotoxicity was observed in rats and rabbits that received vardenafil at up to 18 mg/kg/day during organogenesis. This dose is approximately 100 fold (rat) and 29 fold (rabbit) greater than the AUC values for unbound vardenafil and its major metabolite in humans given the maximum recommended human dose (MRHD) of 20 mg.
In the rat pre-and postnatal development study, the NOAEL (no observed adverse effect level) for maternal toxicity was 8 mg/kg/day. Retarded physical development of pups in the absence of maternal effects was observed following maternal exposure to 1 and 8 mg/kg possibly due to vasodilatation and/or secretion of the drug into milk. The number of living pups born to rats exposed pre-and postnatally was reduced at 60 mg/kg/day. Based on the results of the pre-and postnatal study, the developmental NOAEL is less than 1 mg/kg/day. Based on plasma exposures in the rat developmental toxicity study, 1 mg/kg/day in the pregnant rat is estimated to produce total AUC values for unbound vardenafil and its major metabolite comparable to the human AUC at the MRHD of 20 mg. There are no adequate and well-controlled trials of vardenafil in pregnant women.
STAXYN is not indicated for use in women. It is not known if vardenafil is excreted in human breast milk.
Vardenafil was secreted into the milk of lactating rats at concentrations approximately 10-fold greater than found in the plasma. Following a single oral dose of 3 mg/kg, 3.3% of the administered dose was excreted into the milk within 24 hours.
STAXYN is not indicated for use in pediatric patients. Safety and efficacy in children has not been established.
Vardenafil AUC and Cmax in elderly males 65 years or older taking STAXYN were increased by 39% and 21%, respectively, in comparison to patients aged 45 years and below. No overall differences in safety or effectiveness were observed between patients ≥ 65 years old and those < 65 years old in placebo-controlled clinical trials [see CLINICAL PHARMACOLOGY].
Do not use STAXYN in patients with moderate or severe hepatic impairment.
In volunteers with mild hepatic impairment (Child-Pugh A), the Cmax and AUC following a 10 mg vardenafil (film-coated tablets) dose were increased by 22% and 17%, respectively, compared to healthy control subjects. STAXYN can be used in patients with mild hepatic impairment. In volunteers with moderate hepatic impairment (Child-Pugh B), the Cmax and AUC following a 10 mg vardenafil (film-coated tablets) dose were increased by 130% and 160%, respectively, compared to healthy control subjects. Vardenafil has not been evaluated in patients with severe (Child-Pugh C) hepatic impairment. Do not use STAXYN in patients with moderate to severe hepatic impairment. [See WARNINGS AND PRECAUTIONS and DOSAGE AND ADMINISTRATION]
Do not use STAXYN in patients on renal dialysis.
In volunteers with mild renal impairment (CLcr = 50–80 mL/min), the pharmacokinetics of vardenafil 20 mg film-coated tablets were similar to those observed in a control group with normal renal function. In the moderate (CLcr = 30–50 mL/min) or severe (CLcr < 30 mL/min) renal impairment groups, the AUC of vardenafil was 20–30% higher compared to that observed in a control group with normal renal function (CLcr > 80 mL/min). STAXYN can be used in patients with mild, moderate or severe renal impairment. Do not use STAXYN in patients on renal dialysis as vardenafil has not been evaluated in such patients [see DOSAGE AND ADMINISTRATION and WARNINGS AND PRECAUTIONS].This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 10/2/2015
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