Extended Duration of Efficacy of Vardenafil When Taken 8 Hours Before Intercourse: A Randomized, Double-Blind, Placebo-Controlled Study

It is not possible to determine whether these events were related directly to the use of PDE5 inhibitors or to other factors. Inform patients of the increased risk of NAION in individuals who have already experienced NAION in one eye and discuss 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 vardenafil, for this uncommon condition. Advise patients to stop treatment 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.

• Effectiveness can vary based on individual physiology and ED severity.
• Available in some markets as orally disintegrating tablets (ODT).
• The 20 mg tablet is often scored, allowing for splitting if prescribed.
• A patient assistance program may exist for the brand-name medication.
• Regular follow-ups with a doctor are recommended to assess ongoing use.
• It is one of several effective second-line oral treatments for ED.

It is not possible to determine whether these events are related directly to the use of PDE5 inhibitors or to other factors. The use of vardenafil offers no protection against sexually transmitted diseases.

4 Discussion

The trial was designed to detect changes in retinal function that might occur in more than 10% of patients. Vardenafil did not produce clinically significant ERG or FM-100 effects in healthy men compared to placebo. Two patients on vardenafil in the trial reported episodes of transient cyanopsia (objects appear blue). There was no effect on sperm motility or morphology after single 20 mg oral doses of vardenafil in healthy volunteers. The pharmacokinetics of vardenafil are approximately dose proportional over the recommended dose range.

When to interrupt dosage

Absorption: Vardenafil is rapidly absorbed with absolute bioavailability of approximately 15%. Maximum observed plasma concentrations after a single 20 mg dose in healthy volunteers are usually reached between 30 minutes and 2 hours (median 60 minutes) after oral dosing in the fasted state. Two food-effect studies were conducted which showed that high-fat meals caused a reduction in Cmax by 18%-50%. Distribution: The mean steady-state volume of distribution (Vss) for vardenafil is 208 L, indicating extensive tissue distribution. Vardenafil and its major circulating metabolite, M1, are highly bound to plasma proteins (about 95% for parent drug and M1).

Safety and efficacy of vardenafil for the treatment of men with erectile dysfunction after radical retropubic prostatectomy

This protein binding is reversible and independent of total drug concentrations. Following a single oral dose of 20 mg vardenafil in healthy volunteers, a mean of 0.00018% of the administered dose was obtained in semen 1.5 hours after dosing. Metabolism: Vardenafil is metabolized predominantly by the hepatic enzyme CYP3A4, with contribution from the CYP3A5 and CYP2C isoforms. The major circulating metabolite, M1, results from desethylation at the piperazine moiety of vardenafil. The plasma concentration of M1 is approximately 26% that of the parent compound. Counseling of patients about protective measure necessary to guard against sexually transmitted diseases, including the Human Immunodeficiency Virus (HIV), should be considered.

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Advise patients that the disintegrating tablet (Staxyn) is not interchangeable with the film-coated tablet (Levitra). General Notes: May be taken with or without food. (Tablet) Place on tongue to disintegrate; take without liquid and immediately upon removal from blister. Take once daily as needed, about 1hr before sexual activity. Moderate hepatic impairment: initially 5mg; max 10mg. Cardiovascular disease (eg, MI, stroke or life-threatening arrhythmia within 6 months; systolic BP <90mmHg or BP >170/110mmHg; unstable angina, LV outflow obstruction, severe heart failure), severe hepatic impairment, on renal dialysis, hereditary degenerative retinal disorders and retinitis pigmentosa: not recommended.

Condition	Explanation	Risk Level
Use with Nitrates	Can cause dangerous hypotension	High
Severe Liver Impairment	May affect drug metabolism	Moderate
Heart Conditions	Especially unstable angina or recent heart attack	High
Retinitis Pigmentosa	Potential risk due to PDE6 expression in retina	Caution

History of non-arteritic anterior ischemic cenforce professional 100 optic neuropathy (NAION) or those with "crowded" optic disc. Advise patients to discontinue if sudden vision or hearing loss occurs.

Region	Approximate Cost	Notes
North America	$10 - $15	Generic versions available
Europe	€8 - €12	Brand and pharmacy differences
Asia	$2 - $8	Widely available, varies by country
Online Pharmacies	$3 - $10	Verify authenticity

Patients for whom sexual activity is inadvisable or contraindicated.

Precaution	Explanation	Recommended Action
Cardiovascular Risk	Risk of sudden cardiac events	Medical evaluation required
Vision Disturbances	Rare side effect involving PDE6	Seek medical attention if occurs
Alcohol Consumption	May increase side effects	Limit or avoid consumption
Renal Impairment	Alters drug clearance	Dose adjustment possibly needed

Mean steady-state volume of distribution: 208 L. Additive hypotensive effects with concomitant α-blockers, other antihypertensives; caution. Concomitant other erectile dysfunction treatments: not recommended.

Pregnancy & Lactation

Inform patients of the potential cardiac risk of sexual activity for patients with preexisting cardiovascular risk factors. Inform patients that in some patients concomitant use of PDE5 inhibitors, including vardenafil, with alpha-blockers can lower blood pressure significantly leading to symptomatic hypotension (for example, fainting). Patients prescribed vardenafil who are taking alpha-blockers should be started on the lowest recommended starting dose. 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 vardenafil are prescribed by another healthcare provider.

What are the serious side effects of vardenafil?

Discuss with patients the appropriate use of tadacip 20mg vardenafil and its anticipated benefits. It should be explained that sexual stimulation is required for an erection to occur after taking vardenafil. It should be taken approximately 60 minutes before sexual activity. Patients should be counseled regarding the dosing of vardenafil especially regarding the maximum daily dose. Patients should be advised to contact their healthcare provider for dose modification if they are not satisfied with the quality of their sexual performance with vardenafil or in the case of an unwanted effect. Formerly known under the brand name Levitra.

What special dietary instructions should I follow?

This metabolite shows a phosphodiesterase selectivity profile similar to that of vardenafil and an in vitro inhibitory potency for PDE5 28% of that of vardenafil. Therefore, M1 accounts for approximately 7% of total pharmacologic activity. Elimination: The total body clearance of vardenafil is 56 L/h, and the terminal half-life of vardenafil and its primary metabolite (M1) is approximately 4-5 hours. After oral administration, vardenafil is excreted as metabolites predominantly in the feces (approximately 91-95% of administered oral dose) and to a lesser extent in the urine (approximately 2-6% of administered oral dose). Pediatrics: Vardenafil is not indicated for use in pediatric patients.

Legal Class

Vardenafil trials were not conducted in the pediatric population. Geriatric: In a healthy volunteer study of elderly males (≥65 years) and younger males (18-45 years), mean Cmax and AUC were 34% and 52% higher, respectively, in the elderly males. Hepatic Impairment: In volunteers with mild hepatic impairment (Child-Pugh A), the Cmax and AUC following a 10 mg vardenafil dose were increased by 22% and 17%, respectively, compared to healthy control subjects. In volunteers with moderate hepatic impairment (Child- Pugh B), the Cmax tadalista professional and AUC following a 10 mg vardenafil 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.

Who should not take vardenafil?

Renal Impairment: In male volunteers with ClCr= 50-80 mL/min, the pharmacokinetics of vardenafil were similar to those observed in a control group with ClCr >80 mL/min. In male volunteers with ClCr = 30-50 mL/min or ClCr <30 mL/min renal impairment groups, the AUC of vardenafil was 20-30% higher compared to that observed in a control group with ClCr >80 mL/min). Vardenafil pharmacokinetics have not been evaluated in patients requiring renal dialysis. Advise patients of the contraindication of vardenafil 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. Aim: Vardenafil is a highly selective and potent phosphodiesterase type-5 inhibitor for the treatment of erectile dysfunction (ED). The efficacy of vardenafil has been demonstrated in a broad range of ED populations, but has not yet been assessed in Japanese patients with diabetes mellitus (DM), although DM is frequently associated with difficult-to-treat ED. This is the first study to investigate whether high-dose vardenafil (20 mg) can demonstrate superior efficacy to the usual dose (10 mg) in this subpopulation in Japan.

Brand names

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 stop treatment 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 post-marketing in temporal association with the use of all PDE5 inhibitors. Methods: The study was a randomized, placebo-controlled, double-blind, multi-centre, parallel group comparison 12-week study. Following 4 weeks observation period, 778 patients aged 26-64 years old with ED and DM (HbA1c >12% at screening was excluded) both of more than 3 years duration were randomly allocated to one of the three groups, vardenafil 10 mg, 20 mg, or placebo (randomization ratio 3:3:1).

• Vardenafil can cause side effects like headaches and flushing.
• It should not be taken with nitrate medications due to risk of blood pressure drop.
• Alcohol can increase side effects when combined with vardenafil.
• Consult a doctor before starting vardenafil to check for contraindications.

Erectile function (EF) domain score of the International Index of Erectile Function was estimated as the primary efficacy parameter. Results: Vardenafil 10 and 20 mg both significantly improved the EF domain score from 13.6 and 13.9 at baseline to 21.8 and 22.9 at last observation carried forward (LOCF), respectively, compared to placebo (13.7 at baseline to 16.3 at LOCF; p<0.0001). In addition, vardenafil 20 mg demonstrated superior efficacy to 10 mg (p<0.05), and the difference was more evident in severe ED patients (baseline EF domain score <11).