Content Area

CLINICAL PHARMACOLOGY Mechanism of ActionPenile erection is a hemodynamic process initiated by the relaxation of smooth muscle in the corpus cavernosum and its associated arterioles. During sexual stimulation, nitric oxide is released from nerve endings and endothelial cells in the corpus cavernosum.

Effect of Co-administration of Potent CYP3A4 Inhibitors

DESCRIPTION LEVITRA® is an oral therapy for the treatment of erectile dysfunction. This monohydrochloride salt of vardenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).Vardenafil HCl is designated chemically as piperazine, 1-[[3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f ][1,2,4]triazin-2-yl)-4-ethoxyphenyl]sulfonyl]-4-ethyl-, monohydrochloride and has the following structural formula:Vardenafil HCl is a nearly colorless, solid substance with a molecular weight of 579.1 g/mol and a solubility of 0.11 mg/mL in water. LEVITRA is formulated as orange, round, film-coated tablets with “BAYER” cross debossed on one side and “2.5”, “5”, “10”, and “20” on the other side corresponding to 2.5 mg, 5 mg, 10 mg, and 20 mg of vardenafil, respectively. LEVITRA® is an oral therapy for the treatment of erectile dysfunction. Vardenafil HCl is designated chemically as piperazine, 1-[[3-(1,4-dihydro-5-methyl-4-oxo-7-propylimidazo[5,1-f ][1,2,4]triazin-2-yl)-4-ethoxyphenyl]sulfonyl]-4-ethyl-, monohydrochloride and has the following structural formula: Vardenafil HCl is a nearly colorless, solid substance with a molecular weight of 579.1 g/mol and a solubility of 0.11 mg/mL in water. Nitric oxide activates the enzyme guanylate cyclase resulting in increased synthesis of cyclic guanosine monophosphate (cGMP) in the smooth muscle cells of the corpus cavernosum. The cGMP in turn triggers smooth muscle relaxation, allowing increased blood flow into the penis, resulting in erection.

Product	Dosage	Quantity + Bonus	Price
Levitra Generic	20mg	180 + 10 Pills	293.10€ 279.14€	Buy
Levitra Generic	40mg	120 + 8 Pills	302.37€ 287.97€	Buy
Levitra Original	20mg	76 + 4 Pills	344.39€ 327.99€	Buy
Levitra Soft Tabs	20mg	180 + 10 Pills	398.14€ 379.18€	Buy
Levitra Professional	20mg	30 Pills	119.12€ 113.45€	Buy
Levitra Generic	60mg	10 Pills	47.42€ 45.16€	Buy
Levitra Original	20mg	92 + 4 Pills	406.22€ 386.88€	Buy
Levitra Generic	20mg	360 + 10 Pills	458.44€ 436.61€	Buy
Levitra Generic	10mg	90 + 8 Pills	150.58€ 143.41€	Buy
Levitra Generic	10mg	120 + 10 Pills	178.59€ 170.09€	Buy
Levitra Generic	60mg	120 + 8 Pills	372.33€ 354.60€	Buy

The tissue concentration of cGMP is regulated by both the rates of synthesis and degradation via phosphodiesterases (PDEs). The most abundant PDE in the human corpus cavernosum is the cGMP-specific phosphodiesterase type 5 (PDE5); therefore, the inhibition of PDE5 enhances erectile function by increasing the amount of cGMP. Because sexual stimulation is levitra woman required to initiate the local release of nitric oxide, the inhibition of PDE5 has no effect in the absence of sexual stimulation.In vitro studies have shown that vardenafil is a selective inhibitor of PDE5.

What happens if I miss a dose?

The 20-30% who still do not respond generally have ED related to an irreversible physical abnormality due to chronic poor blood flow (often smoking-related) or damaged penile tissue (often diabetes, high cholesterol and after prostate cancer surgery). The best option for these patients remains an inflatable penile prosthesis. Question: You said that the PDE5 inhibitors were comparable in efficacy. What about reports that Levitra is more effective than Viagra in treating ED among men with diabetes? Answer: Clinical trial reveals that all three medications have the same success regardless of patient age, underlying medical condition or severity of erectile dysfunction.

Related treatment guides

There is no head-to-head evidence of that, and what literature there is may be misleading. My belief is that clinical experience will show them to be similar. Data from Six Degrees Survey, October 2001. men who require fast onset or better absorption should avoid fatty meals or take these pills on an empty stomach; start foreplay later in older patients (who may need up to 2 hours to absorb the medicicne); do not give up before making at least 3 attempts at intercourse having at the maximum dose: Viagra 100 mg, Levitra 20mg. Contains inactivated NDC Code(s)NDC Code(s): 43353-323-02, 43353-323-06 If you are a consumer or patient please visit this version. The inhibitory effect of vardenafil is more selective on PDE5 than for other known phosphodiesterases (>15-fold relative to PDE6, >130-fold relative to PDE1, >300-fold relative to PDE11, and >1,000-fold relative to PDE2, 3, 4, 7, 8, 9, and 10).PharmacokineticsThe pharmacokinetics of vardenafil are approximately dose proportional over the recommended dose range. Vardenafil is eliminated predominantly by hepatic metabolism, mainly by CYP3A4 and to a minor extent, CYP2C isoforms.

Advice	Explanation	Cautionary Notes
Take on an empty stomach	Food, especially high-fat, delays absorption	Avoid heavy meals before use
Avoid alcohol	Can increase side effects	Excessive alcohol can impair effectiveness
Follow prescribed dose	To minimize side effects and interactions	Do not double dose in case of missed dose

Concomitant use with potent CYP3A4 inhibitors such as ritonavir, indinavir, ketoconazole, as well as moderate CYP3A inhibitors such as erythromycin results in significant increases of plasma levels of vardenafil (see PRECAUTIONS, WARNINGS and DOSAGE AND ADMINISTRATION). Mean vardenafil plasma concentrations measured after the administration of a single oral dose of 20 mg to healthy male volunteers are depicted in Figure 1.Figure 1: Plasma Vardenafil Concentration (Mean ± SD) Curve for a Single 20 mg LEVITRA DoseAbsorption:Vardenafil is rapidly absorbed with absolute bioavailability of approximately 15%.

Alternative medication therapies

Duration was important only in terms of lasting long enough to complete intercourse. Few men (or their partners) felt that multiple buy levitra no prescription erections, or the ability to achieve them over time, were critical as long as one dose was enough for a successful encounter. Most complaints were about high cost or lack of insurance coverage. An underlying desire was reported by most couples for initiation of sex to be normal (spontaneous and natural). Few patients fully understood the duration of activity that Viagra can provide, and its advantages.

Is Cialis stronger than Viagra?

Cialis may indeed fulfill the desire that couples and patients with ED have for the initiation of sex to be normal (spontaneous and natural). Although Viagra, Levitra and Cialis are safe and effective they do, like all medications, have disadvantages. They essentially enhance partial (sexual) erections, rather than initiating them. At best, the response rate among men with advanced ED (for example following radical prostatectomy) is 30%. Fewer than 505 of men with Diabetes will respond. 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).

What is Levitra 20mg

Correct administration of Viagra and Levitra is critical, and if one does not work when taken correctly, no other oral “Viagra like drug” (PDE5 inhibitor like Levitra or Cialis) will either. In conclusion, the potencies of Viagra, Levitra and Cialis are broadly similar, but each has unique pharmacological properties related to its molecular structure. Viagra is an exemplary PDE-5 inhibitor that, after 10 years of widespread clinical use, is acknowledged to be effective and particularly well tolerated. Cialis and Levitra are the newer medications and are similar to Viagra in their efficacy and contraindications. The only new attributes of clinical significance are the lack of food interaction and the long duration of action of Cialis.

How to use Levitra 20mg?

This may translate into greater efficacy of the first dose as well as a return to more spontaneous (normal) initiation of sexual activity (broader window of opportunity). Question: Is it possible to identify potential non-responders to oral therapy? Answer: No, it is not possible to identify potential non-responders to a PDE 5 inhibitor such as Cialis, Levitra or Viagra, other than by a trial of these medications in the setting of sexual activity. Patients, who appear to be non-responders to Viagra or generic levitra 24 h buy Levitra, need to repeat a trial on an empty stomach a few different times before giving up. Cialis absorption and onset of action is not affected by food. 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.

Cardiovascular effects

Alternative oral therapies for Erectile Dysfunction (availability may vary geographically) are Uprima (apomorphine), and phentolamine. Both Uprima and phentolamine have very low or no efficacies and therefore for present purposes will not be addressed. Uprima is approved for the treatment of Erectile Dysfunction in Europe and initial sales have not been very impressive (less than 20% of ED market). Refill rates are dismal supporting lack of efficacy. Phentolamine’s application to the FDA was withdrawn and the drug is not available.

Can you take Levitra and Cialis together?

Although Viagra, Levitra and Cialis differ in their biochemical potency and selectivity, and in onset and duration of action, it is important not to extrapolate those findings inappropriately to the clinical setting. For example, greater biochemical potency does not necessarily translate into enhanced clinical efficacy. In short, there appears to be little biochemical or clinical differences between the three agents except for the lack of food interaction and the duration of activity for Cialis. All three medications are contraindicated in patients who take nitrates. A recent survey looking at what patients with ED really want from their treatment found that efficacy and a favorable side-effect profile were the highest priorities³ Fast onset was desirable, but there were major differences in what was considered fast. The plasma concentration of M1 is approximately 26% that of the parent compound.

Medication	Effectiveness Score	Onset Time	Duration	Note
Levitra 100 mg	High	30-60 min	Up to 4-5 hours	Among ED treatments
Sildenafil	High	30-60 min	4-6 hours	Similar but different dosing
Tadalafil	Very high	30 min	Up to 36 hours	Longer-lasting option

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.

• Levitra 100 mg pills are usually round and blue.
• The medication should be purchased with a prescription.
• It is available in most pharmacies worldwide.
• Generic versions may be less expensive.
• Always check the expiry date before use.
• Do not share medication with others.
• Consult a doctor if you experience prolonged erection.
• Levitra 100 mg does not cure ED permanently.
• Use as part of a comprehensive treatment plan.
• Do not operate heavy machinery after taking.
• Be aware of possible allergic reactions.
• Levitra 100 mg has been studied extensively.

Therefore, M1 accounts for approximately 7% of total pharmacologic activity.Excretion: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.

• Levitra 100 mg may interact with antihypertensives.
• Patients with priapism should seek immediate help.
• Regular use without medical consultation is risky.
• Alcohol consumption can enhance side effects.
• Levitra 100 mg can cause vision disturbances.
• Do not take more than once in 24 hours.
• Inform your doctor about all current medications.
• Use with caution in elderly patients.
• Be aware of possible sudden decrease in blood pressure.
• Do not use with other ED medications simultaneously.
• Levitra 100 mg is not suitable for women.
• Always follow your healthcare provider’s instructions.